# Cookware & Stove Accessories: research notes

Date: 2026-10-25. Scope: add-ons that go on a pan (universal and replacement lids, mesh splatter screens, in-pan splatter walls), in a pot (collapsible steamer baskets, bamboo steamer tiers), under a pan (induction interface discs, heat diffusers or simmer plates, wok rings), or on the stove itself (coil-range drip bowls and drip pans, burner and stove-top covers, stove gap covers); not the pans, pots, woks or kettles themselves.

Overlaps left to siblings: pans, woks and griddles (`frying-pans`), pots with matched steamer or pasta inserts sold as one item (`saucepans`, `cookware-sets`), pot holders and silicone handle sleeves (`oven-mitts`), pressure-cooker gaskets and canner racks (`pressure-cookers`), lid and pan racks and pan protectors for stacking (`household / kitchen-organizers`), strainers (`strainers`), kettles (`stovetop-kettles`), thermometers (`thermometers`). Burner elements and gas grates are range parts; the machines `household_appliance_accessory` enum does not cover range parts, so drip bowls stay here because the existing add-on's `fits_brand_or_model` field is clearly meant for them.

Quote labels: **verbatim** = the sentence in quotation marks was in text I read myself (curl plus tag stripping, pdftotext on a downloaded PDF, or Shopify `products.json`); **fetched excerpt** = the WebFetch tool summarised or lightly reworded the page; **search excerpt** = the claim came only from a search-engine summary. A search-excerpt-only number does not go in category.json.

Research constraint: the shared WebSearch budget for the session ran out (200 of 200) partway through, so later sources were reached by known URL with curl, WebFetch or the Internet Archive. Several obvious sources could not be reached (see "Could not reach").

## Seed

Seed output, verbatim:

```
=== Example entry (from an unrelated category) ===
category: bedsheets
what this shows: the expert split is often not the number everyone advertises. Thread count is the generic trap here. Weave is what changes how the sheet feels and sleeps.

<example>
{
  "id": "weave",
  "label": "Weave",
  "definition": "The pattern the threads are crossed in, which decides how the sheet feels and how it handles heat.",
  "why_experts_care": "Percale is a simple one-over-one weave that feels crisp and cool and gets softer with washing. Sateen puts more thread on the surface so it feels silky and warmer and shows wear sooner. Thread count, the number most listings lead with, matters far less than which of these two you pick, and above about 400 it is mostly marketing.",
  "kind": "categorical",
  "values": ["percale", "sateen", "linen", "flannel", "jersey"],
  "roles": ["split", "filter"],
  "novice_answerable": true,
  "cold_start_question": "Do you sleep hot, or do you like a sheet that feels smooth and a bit warm?",
  "source": "listing",
  "listing_field_hint": "Usually in the title or the first bullet. Sometimes only in the fabric care tab.",
  "backfill_cost": "low",
  "backfill_note": "When missing, the product photo and the description words 'crisp' or 'silky' usually settle it.",
  "visual": { "chartable": false },
  "priority": { "narrows_set": 4, "cost_to_answer": 1 },
  "evidence": ["wirecutter_sheets", "textile_primer"]
}
</example>

=== Persona ===
A pharmacist, who thinks in concentration, delivery form and interactions

Ask yourself two things and write the answers under 'Seed' in notes.md:
  1. What is the cookware-stove-accessories equivalent of the example above?
  2. What would this persona notice first about cookware-stove-accessories that a typical buyer would not?
Keep what survives the data check. Drop the rest.
```

1. **The equivalent of thread count is the compatibility line in the title: "for glass cooktop", "induction adapter", "fits all stoves".** Listings lead with it; it is the number-like claim everyone advertises. The Amviner listing is titled "Heat Diffuser for Glass Cooktop, Induction Cooktop Adapter Plate" (verbatim), one plate sold for two different jobs on two stove types. The stove makers say the opposite: GE "Do not use any kind of diffuser or similar product on any cooktop burner, including an electric coil, induction or radiant/halogen surface" (verbatim); Miele "Do not use induction adapter plates" (verbatim). Like weave versus thread count, what matters is not the claim on the box but which job the plate does (spread heat, or make a non-magnetic pan work on induction) and whether the stove's maker allows it. **Kept** as `maker_warning` plus two judgements. For the on-the-pan items the weave-like choice is whether the cover traps or vents steam: **kept** as `cover_venting`.
2. **A pharmacist sees a contraindication table first: accessory × stove × pan base.** "Interactions": the same disc works passably under a smooth copper pan and overheats under aluminium or a hammered base (CenturyLife, verbatim, one tester). "Delivery form": on induction the disc, not the pan, is heated, and heat then crosses an air gap (CenturyLife; Wikipedia). "Concentration": a diffuser spreads heat (CooksInfo, Kitchn) while a wok ring concentrates it (Wikipedia) and GE calls the ring "a heat trap". **Kept**: the stove compatibility grid (visual grammar), `maker_warning` as a derived lookup, the pan-base judgement (medium, one source). **Dropped**: a "heat reduction percentage" for diffusers (no source measures it); a chrome-versus-porcelain drip bowl efficiency facet (only one seller's claim, see "Dropped").

## Sources and what each supports

### Stove makers (manuals and support pages)

**GE Appliances, Range & Cooktop: Cookware and Accessories Not Recommended (support page, curl)**
https://products.geappliances.com/appliance/gea-support-search-content?contentId=21068
- verbatim: "Woks: Do not use a wok on a gas range burner if the wok has a round metal ring that is placed over the burner grate to support the wok. This ring acts as a heat trap which may damage the burner grate and burner head. Also, it may cause the burner to work improperly which can create a health hazard."
- verbatim: "Diffuser: A "diffuser" is a solid or perforated piece of metal used to lower the heat of a burner. Do not use any kind of diffuser or similar product on any gas burner."
- verbatim (electric): "Do not use any kind of diffuser or similar product on any cooktop burner, including an electric coil, induction or radiant/halogen surface."
- verbatim: "We do not recommend the use of a wire trivet on any of our electric ranges, including an electric coil, induction or radiant/halogen surface."
- verbatim: "Silicone Mats or Grill Mats: Although they may be approved for use at higher temperatures, usually the temperature limit is 350 degrees Fahrenheit to 450 degrees Fahrenheit. The cooking surface could get hotter than this. They are not recommended for use on electric coil, induction, or radiant/halogen burners."
- verbatim: "Cooktop Grills: We do not recommend that cooktop grills be used with our sealed burner gas cooktops. Their use may cause incomplete gas combustion and potential exposure to carbon monoxide."
- Supports: `maker_warning`, the diffuser and wok ring judgement, the 350 to 450 °F silicone figure. Confidence high for what GE says; one maker.

**GE JP340/JP350 radiant cooktop owner's manual, 49-80139 (PDF, pdftotext)**
https://www.geappliances.com/content/older-pdfs/49-80139.PDF
- verbatim: "Do not use woks that have support rings. This type of wok will not heat on glass surface units." "We recommend that you use only a flat-bottomed wok."
- verbatim: "Smother a flaming pan on a surface unit by covering the pan completely with a well-fitting lid, cookie sheet or flat tray."
- verbatim: "Do not leave paper products, cooking utensils or food on the cooktop when not in use." "Keep cooktop clean and free of accumulation of grease or spillovers which may ignite."
- verbatim: "Do not place lids on the surface units, particularly wet lids."
- Supports: wok rings do not work on glass tops; the lid-as-fire-tool judgement; stove-top covers sitting on a cooktop. Confidence high.

**Miele induction cooktop operating and installation instructions (PDF, pdftotext)**
https://media.miele.com/downloads/05/5b/04_96106EC61D151EECA3CA26EF69AF055B.pdf
- verbatim: "If an induction adapter plate is used for cookware, the induction generator may be damaged or even destroyed. Do not use induction adapter plates."
- verbatim: "An induction cooking zone only works when a pan with a magnetic base is placed on it"; "Unsuitable pans ... aluminium or copper pans ... glass, ceramic or earthenware pots and pans"; "hold a magnet to the base of the pan in several different places. If the magnet sticks, the pan is generally suitable."
- verbatim: "Do not use the cooktop as a resting place for anything else."; "there is a risk of metal items placed on the cooktop heating up."
- verbatim: "Pans with a base diameter within the given range may be used."
- Supports: `maker_warning` for discs, the magnet test in vocabulary, stove-top covers, plate diameter matching the zone. Confidence high.

### Specialist reviewers and testers

**CenturyLife, The inefficiency of induction converter discs (curl)**
https://www.centurylife.org/the-inefficiency-of-induction-converter-discs-aka-induction-interface-discs-and-what-your-real-alternatives-are/
- verbatim: "Such a disc is usually made out of magnetic stainless steel. The disc absorbs the magnetic waves from the induction stove and converts that energy into heat."
- verbatim (mechanism): "those imperfectly-smooth metal surfaces trap countless microscopic pockets of air between them. Air is an insulator"; "the heat builds up in the converter disc, and the disc becomes much hotter than the bottom of the pot."
- verbatim (test, two Vollrath 1800 W cookers set to about 1500 W, 1.875 kg water each): "After about 8 minute and 40 seconds (0.22 kWh), the no-converter pot achieved a strong rolling boil ... Meanwhile, the converter pot barely reached 160F."; "After about 10 minutes and 30 seconds, the converter pot's induction stove started throttling down from an average of ~1500 watts down to ~1200 watts"; "At about 19 minutes, the converter pot limped to 210F ... Total energy consumption: 0.41 kWh. So it took twice as much energy to boil water with a converter disc".
- verbatim (pan base): copper "does a good-enough job of pulling heat away"; "I would not recommend using aluminum-bottomed cookware with induction interface discs, not even for boiling water."; "don't try to use hammered cookware with induction converter discs."
- Supports: the disc trade-off and judgement, the pan-base judgement. Confidence high for the measurement, which is one tester's one run; the figures stay in notes and are not used as numbers in the JSON.

**Tom's Guide, Experts advise against using converter discs on induction cooktops (curl)**
https://www.tomsguide.com/home/home-appliances/experts-advise-against-using-converter-discs-on-induction-cooktops-heres-why
- verbatim (BSH product manager): "induction cooktops are designed with specific performance standards in mind, and untested accessories such as converter discs could interfere with these standards."
- verbatim: "unless you have multiple converter discs that are precisely the same size as your cookware, it's likely that the cooktop will be using more energy".
- verbatim (Miele trainer): "do not recommend using convertor disks on induction cooktops"; "from a technical perspective these can negatively affect the electronics."
- verbatim: "If your induction cooktop starts heating up a metal convertor disc without a pot on top, you could end up with scalding hot metal discs on your cooktop."
- Supports: second source for disc inefficiency and hob risk; disc size should match the pan. Confidence medium-high (journalist quoting makers).

**Wikipedia, Induction cooking (curl)**
https://en.wikipedia.org/wiki/Induction_cooking
- verbatim: "Induction disks are metal plates that are heated by induction and heat non-ferrous pots by thermal contact, but these are much less efficient than ferrous cooking vessels."
- Supports: disc mechanism and inefficiency (third source). Confidence medium.

**America's Test Kitchen, The Best Splatter Screens (December 2025, curl)**
https://www.americastestkitchen.com/equipment_reviews/1618-splatter-screens
- verbatim: "Typically, splatter screens are round, perforated stainless-steel disks with a handle. They sit directly on top of the skillet or saucepan"; "Unlike lids, they release some steam that would otherwise be trapped and affect the cooking process (think: soggy chicken skin)."
- verbatim: "Traditional splatter screens are generally intended to fit 12-inch skillets and can also be placed atop smaller 8- or 10-inch skillets."
- verbatim (Frywall): "a tall silicone ring that you position inside a skillet"; "you'll have to buy different size Frywalls for smaller or larger pans"; "it's a little difficult to monitor cooking progress while the splatter screen is in place" (of the BergKoch mesh screen).
- verbatim (mesh): "We looked at the screens under a microscope and found a visible difference in the thickness of the strands of metal that form the mesh. Screens made with heavier gauges were more effective. The lowest-performing screen was made from thin wires that didn't successfully block grease"; "traditional splatter screens with tight mesh" kept splatter to a minimum.
- Supports: `cover_venting`, `mesh_gauge`, the fit range of flat screens, the visibility trade-off. Confidence high.

**America's Test Kitchen, A love letter to my splatter screen (2022, curl)**
https://www.americastestkitchen.com/articles/5593-a-love-letter-to-my-splatter-screen
- verbatim: "The mesh is tight enough so that oil won't sputter back at me but also loose enough that steam is able to safely escape."
- Supports: the venting mechanism. Confidence medium (same organisation as above; not counted as an independent second source).

**The Kitchen Professor, Best splatter screen for fry pans (curl)**
https://thekitchenprofessor.com/blog/best-splatter-screen-for-fry-pans/
- verbatim: "instead of being completely enclosed it is mesh or perforated with many holes. Air and heat escape but not the grease."
- verbatim: "Splatter screens come in many different ways from wire mesh to silicone (silicone isn't a very good option though)."
- verbatim: "The screen fits 8 inch 10 inch, and 12 inch skillets" (of a 13 in screen); "you will have to prop it up on something so that it doesn't tip the pan over if it is smaller than 12 inches."
- Supports: second source for the 8 to 12 in fit of a 13 in screen; that screens vent. Confidence medium (affiliate blog).

**America's Test Kitchen, The Best Collapsible Steamer Baskets (curl)**
https://www.americastestkitchen.com/equipment_reviews/1885-collapsible-steamer-baskets
- verbatim: "we generally prefer collapsible versions, which fit a wide variety of pots"; "The models we tested can be used in a wide array of vessels measuring at least 7.5 inches in diameter".
- verbatim: "silicone is floppy, so the steamers often struggled to contain food"; "their interlocked handles sprung a little too high in some pots, which prevented lids from closing tightly"; "For those reasons, we prefer metal steamers."
- verbatim thresholds: "We preferred models that had flat surfaces measuring at least 60 square inches"; "center handles that were (or could be extended to) at least three inches in height"; "legs measuring at least 1 inch tall"; "Models with surface areas smaller than 30 square inches were simply too small".
- Supports: `steamer_build`. The area, handle and leg thresholds are one reviewer's preferences; kept here, not in the JSON as numbers.

**America's Test Kitchen, The Best Bamboo Steamers (curl)**
https://www.americastestkitchen.com/equipment_reviews/2345-bamboo-steamers
- verbatim: "most commonly available as sets of two or three 10-inch round bamboo tiers—a size that is compatible for use with a 14-inch wok or a 12-inch skillet or sauté pan"; "Each tier provides about 68 square inches of surface area—roughly the same surface area as our favorite metal steamer."
- verbatim: "bamboo steamers are more fragile than metal steamer baskets—they must be washed and dried carefully between uses so that they don't warp, crack, or develop mold"; "the bamboo absorbs some of the steam during cooking, preventing condensation from dripping back onto your food"; "Tiers with metal bands" resist warping.
- Supports: `steamer_build` and the bamboo-versus-metal trade-off. Confidence high for what ATK found.

### Primers

**Wikipedia, Wok (curl)**
https://en.wikipedia.org/wiki/Wok
- verbatim: "Traditionally shaped woks can be used on some Western-style (flat-topped) gas stoves by removing a burner cover and replacing it with a "wok ring", which provides stability and concentrates heat."
- verbatim: "Wok rings are sold in cylindrical and conical shapes. For greatest efficiency with the conical wok ring, position it with the wide side up."
- Supports: wok ring definition and the cooks' side of the wok ring disagreement. Confidence medium.

**The Kitchn, Good Tool: Burner Plate for Low-Heat Simmering (2010; live page 403, read from an Internet Archive snapshot, curl)**
https://web.archive.org/web/2023/https://www.thekitchn.com/good-tool-burner-plate-for-low-107122
- verbatim: "it can be hard to get the heat low enough for things like simmering a delicate sauce or slow-cooking a braise. The solution is using a burner plate!"; "Burner plates, also called simmer plates, fit right over the burner and help to diffuse the heat."
- verbatim: "The best burner plates we've used are fairly thick and made of either cast-iron or steel. Plates made of thin aluminum are cheaper, but we find they don't do as good a job of taming the heat."
- Supports: `plate_build`, diffuser purpose. Confidence medium.

**CooksInfo, Heat Diffuser (curl)**
https://www.cooksinfo.com/heat-diffuser
- verbatim: "It reduces the intensity of the heat that reaches the bottom of a pan, and provides more even heat distribution."; "It will work with both gas and electric burners."; "it can be used to help reduce worries about using clay pots such as Japanese donabes on the stove top."
- verbatim: "One type is made of two pieces of flat metal, both perforated, with an large air space between. These are often made of chromed sheet metal, and may rust"; "Some are not perfectly flat."; "You can get them made of cast iron."; "Other types include open, coiled wires"; "Some induction stove burner converters can also be used as heat diffusers."
- Supports: `plate_build` values, diffuser mechanism, that discs and diffusers overlap. Confidence medium.

**Wikipedia, Heat diffuser (curl)**: "placed on top of a burner on a cooktop to separate the cooking pot or pan from the direct source of heat, making the heat more gentle and even" (verbatim). A stub citing CooksInfo; not counted as independent. Not cited in the JSON.

### Regulators and safety bodies

**21 CFR 177.2600, Rubber articles intended for repeated use (Cornell LII, curl)**
https://www.law.cornell.edu/cfr/text/21/177.2600
- verbatim: "Rubber articles intended for repeated use may be safely used in producing, manufacturing, packing, processing, preparing, treating, packaging, transporting, or holding food, subject to the provisions of this section."
- verbatim: the permitted list includes "Silicone (Si) elastomers containing methyl groups." and four other silicone elastomer families.
- verbatim (e): aqueous food contact "shall yield total extractives not to exceed 20 milligrams per square inch during the first 7 hours of extraction, nor to exceed 1 milligram per square inch during the succeeding 2 hours"; (f) fatty food: "not to exceed 175 milligrams per square inch during the first 7 hours ... nor to exceed 4 milligrams per square inch during the succeeding 2 hours".
- verbatim (g): "finished rubber articles intended for repeated use in contact with food shall be thoroughly cleansed prior to their first use".
- Supports: `food_contact_compliance`; that "FDA-compliant silicone" is an extraction rule, not a heat rating. Confidence high (the regulation itself). EU 1935/2004 and German LFGB were not fetched; they are named only as the EU equivalents in the definition, not as claims.

**US Fire Administration, Cooking fire safety (curl)**
https://www.usfa.fema.gov/prevention/home-fires/prevent-fires/cooking/
- verbatim: "Cooking is, by far, the leading cause of home fires and home fire injuries."; "Keep a pan lid or baking sheet nearby. Use it to cover the pan if it catches on fire. This will put out the fire."; "The leading factor contributing to ignition in nonconfined home cooking fires was unattended equipment (37%)."
- Supports: the lid-as-fire-tool judgement (with GE). Confidence high.

NFPA's cooking page returned only its title to both curl and WebFetch; not used.

### Drip bowls and drip pans

**Certified Appliance Accessories, Choosing the right size of replacement stove drip pans (blog, 2021, curl)**
https://www.certifiedaccessories.com/blogs/news/choosing-the-right-size-of-replacement-stove-drip-pans
- verbatim: "Because there really isn't a true universal drip pan."; "for most stoves, there are 4 primary styles or types from which to choose: A, B, D, and E. And each style comes in two sizes: Large and Small."; "There are also Styles C and F for electric ranges, but they are not as widespread."
- verbatim: "A drip bowl is made from a single piece of metal. It is used under heating elements that are easily removable. A drip pan actually has two pieces—a removable outer ring and then the separate bowl underneath. The two-piece construction is used for stoves that have hinged burner elements."
- verbatim: "Generally, A matches electric stovetops made by Whirlpool, Kenmore (2004 and up), Frigidaire, Maytag, Electrolux, Tappan, Amana, Crosley, and RCA. Style A is also slightly shallower than Style B."; "B drip bowls generally match GE, Hotpoint, Kenmore (1995 to 2003), Roper (1990+), and Monogram electric ranges"; "Style D drip pans fit hinged elements found on GE, Hotpoint ..."; "E fits hinged Whirlpool, Kenmore (2004 and up), Frigidaire ...".
- verbatim: "The common replacement terms of 6 inch and 8 inch can be misleading, as few dimensions actually match those numbers. It's more of a reference to the size of the heating element"; "too many cutouts let gunk drop through to areas that are harder to clean, creating a greater fire hazard."; "that gunk buildup can catch fire!"
- Supports: `coil_mount`, `drip_bowl_style`, the vocabulary for bowl versus pan. Confidence high for the convention, medium for its generality (a seller).

**Certified Appliance Accessories, drip bowl product data (Shopify products.json, verbatim)**
https://www.certifiedaccessories.com/collections/drip-bowls-drip-pans-with-rings
- Titles: "Black Porcelain Style B 2 Large 8-In. & 2 Small 6-In. Replacement Drip Bowls for GE® & Hotpoint® Electric Ranges"; "Chrome Style E Hinged 2 Large 8-In. & 2 Small 6-In. Replacement Drip Pans Plus Rings for Whirlpool®, Kenmore®, Frigidaire® & Maytag® Electric Ranges".
- Body (Style B): "Set of 4 Style B black porcelain drip bowls for non-hinged 2 small & 2 large burners"; "For electric ranges only"; "Small drip bowl dimensions, rounded: 7-5/8" outer dia. & 1-7/8"D"; "Large drip bowl dimensions, rounded: 9-3/4" outer dia. & 1-3/8"D".
- Body (Style E): "for hinged 2 small & 2 large burners"; "Chrome finish reflects heat—improving energy efficiency & speeding cooking time"; "Not compatible with most GE®, Hotpoint® or Kenmore® (1995 to 2003) ranges"; small pan "6-1/4" outer dia.", small ring "7-1/2"".
- Supports: that style, element size, hinged or not, and the range brand are in titles (the listing field hint); that a "6 in" bowl is not 6 in across. Confidence high for what the listing says.

**Cycookery, What style drip pan do I need (WebFetch)**
https://cycookery.com/article/what-style-drip-pan-do-i-need
- fetched excerpt (quoted): "If you have a GE, Hotpoint, Kenmore (1995 to 2003), Roper (1990+), or Monogram electric range, you will likely need a Style B drip pan."; "If you have a Whirlpool, Kenmore (2004 and up), Frigidaire, Maytag, Electrolux, Tappan, Amana, Crosley, or RCA electric stovetop, you will likely need a Style E drip pan."; "The most common sizes are 6-inch and 8-inch".
- Supports: second source for Style B = GE family and the 6 and 8 in sizes. It gives Whirlpool as Style E where Certified gives A (plug-in) and E (hinged); the plug-in versus hinged question resolves it. Confidence medium.

A search excerpt (ckollars.org, unreachable) said "the Style-X system is not standardized and not even used consistently". Not cited; it matches the Certified/Cycookery disagreement.

### Brand and retail pages (fields present)

**Frywall home page (curl)**
https://frywall.com/
- verbatim: "Frywall is made of BPA-free, FDA-compliant silicone that can withstand heat up to 450°F. It's also dishwasher safe"; "FRYWALL FITS YOUR PAN"; customers own "the 8 inch and the 10 inch".
- Supports: second source for the 450 °F silicone ceiling; that the brand states food-contact compliance and heat rating; size-per-pan. Confidence high for what the page says.

**Amazon, ELKKNOVE universal lid listing (curl; served an India-locale render with INR prices, US listing content)**
https://www.amazon.com/Universal-Lid-Pots-Pans-Skillets/dp/B07N3VXLW1
- verbatim title: "Tempered Glass with Heat Resistant Silicone Rim Fits 10.5", 11" and 12" Diameter Cookware"; bullets: "Please measure your pots and pans to make sure"; "Stepped Silicone Gasket Forms a Tight Seal on Pans"; "The Vent Hole is for Exhaust"; detail rows "Material ... silicone rim,tempered glass", "Item Weight 0.73 kg"; dishwasher-safe in bullets. No temperature rating on the page.
- Supports: listing hints for `fit_diameter`, `cover_venting`; that the heat rating is often missing. Confidence high for this one listing.

**Amazon, Amviner induction adapter plate listing (curl)**
https://www.amazon.com/Diffuser-Cooktop-Induction-Adapter-Detachable/dp/B0C3M6D21V
- verbatim title: "Heat Diffuser for Glass Cooktop, Induction Cooktop Adapter Plate for Moka Pot and Pans, Spray Teflon Paint with Detachable Handle, 9.45 Inches".
- verbatim: "The top and the bottom part of the plate are made of stainless steel, the middle part is made of aluminum, allows a perfect heat transmission."; size options "5.5 Inches 9.45 Inches"; "Material Stainless Steel"; "Item Weight 0.75 kg". No thickness field.
- Supports: the conflation judgement, `plate_diameter` and `plate_build` listing hints. Confidence high for this listing.

### Could not reach

Serious Eats (wok guide; 403 to curl, no archive hit), The Woks of Life wok guides (403, archive 404), NFPA cooking page (title only), OXO steamer product page (403), Lowe's and Home Depot drip pan pages (403), Food Network steamer review (403), Kitchen Knife Forums diffuser thread (403), ckollars.org (DNS failure), CPSC recall search (403). No source was found for tempered glass lid shattering, so no claim about it is made. No second range maker's statement on wok rings or diffusers was reached (WebSearch budget exhausted); the GE position is attributed to GE alone.

## Data points used for derived metrics

- `fits_my_pan`: flat mesh screens of about 13 in "fit 12-inch skillets and can also be placed atop smaller 8- or 10-inch skillets" (ATK) and "fits 8 inch 10 inch, and 12 inch skillets" (Kitchen Professor); universal lids state a list ("Fits 10.5", 11" and 12"", Amazon). The rule is the product's stated minimum to maximum against the buyer's measured rim. No tolerance is invented.
- `plate_overhang_in`: Tom's Guide (discs not "precisely the same size as your cookware" use more energy) and Miele (zone accepts "Pans with a base diameter within the given range"). The metric only reports the difference; no threshold is set.

## Against the existing add-on schema

Add-on read: `supplies/kitchen/add-ons/cookware_stove_accessory.jsonc` (`fits_diameter_min`, `fits_diameter_max`, `fits_brand_or_model`), composed with `kitchen-standard.jsonc` (`materials[]` with roles, `max_heat_temp`, `dishwasher_safe`) and `supplies-standard.jsonc` (`high_signal_markdown`, `sizing` with dimensions, capacity, weight, pack_count, pieces_included_text).

| Facet in this register | In add-on today | Proposed kind under AGENTS.md | Note |
|---|---|---|---|
| accessory_job | no | hard filter (enum) | Proposal: `accessory_type` enum [lid, splatter_screen, splatter_wall, steamer_basket, bamboo_steamer, induction_interface_disc, heat_diffuser, wok_ring, drip_bowl, drip_pan_with_ring, burner_or_stovetop_cover, gap_cover, other]. The four `accessory_job` values group these. The leaf has no type field today, so a lid and a drip bowl are indistinguishable in structured data. |
| stove_type | no | hard filter (multi-enum) | Proposal: `stove_types_claimed` [gas, electric_coil, radiant_glass, induction, all_claimed, unspecified]. Store the claim as stated; `maker_warning` overrides it at query time. |
| fit_diameter | yes, `fits_diameter_min` / `fits_diameter_max` | hard filter, but must move inside `sizing` | Rule 2: lids and screens are sold in size variants of one listing, so these vary by variant. Today they sit outside `sizing`. |
| plate_diameter | partly, could reuse `fits_diameter_*` | hard filter (inside `sizing`) | For plates the number is the plate itself; store as `sizing.dimensions` length/width or a single `diameter`. |
| maker_warning | no | derived at query time, not stored | A lookup from accessory type × stove type (table under "Branches"). Not a per-product field. |
| cover_venting | no | high_signal_markdown, or a small enum | A photo shows mesh versus glass; it does not show a vent hole reliably. Vented versus not is text ("vent hole" in bullets). Borderline; prefer markdown. |
| mesh_gauge | no | high_signal_markdown | Reviewers judge it by microscope; listings say "fine mesh". Not a filter. |
| max_heat_temp | yes, kitchen-standard `max_heat_temp` | quality currency for silicone and glass items only | Keep. Augment for silicone items; missing on the ELKKNOVE lid page. |
| food_contact_compliance | no; AGENTS.md rule 5 cuts certifications | high_signal_markdown | It is a safety flag, which the supplies-standard comment allows in markdown ("real safety flags"). Not a column. |
| steamer_build | partly, via `materials` roles | derived from `materials` (silicone, bamboo, stainless_steel) | No new field needed; `bamboo` and `silicone` are already in the enum. |
| plate_build | partly, via `materials` | derived from `materials` (cast_iron, aluminum, stainless_steel, with `core` role for layered discs) | Thickness is not on listings; leave to markdown. |
| coil_mount | no | hard filter (enum) | Proposal: `element_mount` [plug_in, hinged, not_applicable]. Certified titles carry "Hinged". |
| drip_bowl_style | partly, `fits_brand_or_model` (free text) | hard filter (enum) | Proposal: `drip_style` [a, b, c, d, e, f, model_specific, not_applicable] plus keep `fits_brand_or_model` as the raw string. Titles carry both. |
| accessory_type (added 2026-10-25) | no | hard filter (enum) | Same proposal as the original notes' `accessory_type` idea, narrowed to the two leaves that actually lacked a type field: under the pan (disc, diffuser, wok ring) and protecting the stove (drip bowl/pan, burner or stove-top cover, gap cover). Lids, screens, splatter walls and steamers already have one via `cover_venting`/`steamer_build`. |
| plate_magnetic (added 2026-10-25) | no | hard filter (boolean) | Not on listings; derived from `plate_build`'s material (cast iron and most stainless steel magnetic, aluminium and copper not) or a magnet test, per Miele's own instruction. |

Add-on and standard fields this register considers noise for this leaf: `sizing.capacity` (no accessory here is bought by volume); `sizing.weight` except as a proxy for diffuser mass, where it is weak; `pieces_included_text` duplicates `pack_count` for drip bowl sets (always 2 large + 2 small or similar, stated in the title). `dishwasher_safe` is fine but low value; ATK lists it as "Nice to have".

## Branches

Split 1, `accessory_job`:
- **on the pan → ask fit_diameter, cover_venting, mesh_gauge, max_heat_temp, food_contact_compliance; stove_type and steamer_build irrelevant.** (Plate, coil and drip facets are reached only through other branches or through stove_type, so they are not listed.) Chain: lids and screens "sit directly on top of the skillet or saucepan" (ATK), so what decides fit is the rim (ATK and Kitchen Professor on 8 to 12 in skillets; Amazon lid "Fits 10.5", 11" and 12""); venting and mesh are what ATK tested; silicone rims and walls carry a heat rating (Frywall 450 °F; GE 350 to 450 °F for mats) and touch hot fatty food, so food_contact_compliance is asked here too, not only in the pot (Frywall "FDA-compliant silicone"). The stove does not touch the item, so stove_type is irrelevant. SUPPORTED. **2026-10-25: food_contact_compliance added (fix 12b); max_heat_temp chain narrowed to mats, not every silicone part (fix 7).**
- **in the pot → ask fit_diameter, steamer_build, food_contact_compliance; stove_type, cover_venting, mesh_gauge irrelevant.** Chain: steamers must fit the vessel ("vessels measuring at least 7.5 inches in diameter", ATK; bamboo 10 in tiers on a 12 in skillet or 14 in wok, ATK) — this is now stated directly in fit_diameter's backfill_note, not only here (fix 11); build is ATK's main finding (metal over silicone; bamboo for volume); food_contact_compliance's own definition now says it applies to silicone baskets only, not metal or bamboo (fix 12b). SUPPORTED.
- **under the pan → ask accessory_type, stove_type, maker_warning, plate_diameter, plate_build; fit_diameter, cover_venting, mesh_gauge, steamer_build irrelevant.** Chain: accessory_type is asked first to split disc, diffuser and wok ring, since plate_diameter and plate_build fit discs and diffusers only, not rings, which are sized to the wok (fix 5); whether a plate works depends on the burner (Miele: induction needs a magnetic base; GE: rings "will not heat on glass surface units"); makers warn against plates (GE, Miele); disc size against pan base (Tom's Guide's own reporting, not a BSH quote — fix 4); build decides how well heat is tamed (Kitchn), and plate_build is now `researched` since the one listing read misreported a layered disc as "Stainless Steel" (fix 8). fit_diameter (the rim) is replaced by plate_diameter (the base). SUPPORTED.
- **protecting the stove → ask accessory_type, stove_type, maker_warning, max_heat_temp; fit_diameter, cover_venting, steamer_build, plate_diameter irrelevant.** Chain for the irrelevant legs: none of these items sits on, in or under a pan, so rim fit, venting, steamer build and plate size do not apply. Chain: accessory_type splits drip bowl/pan, burner or stove-top cover, and gap cover, since each carries different heat and fit rules (fix 5); drip bowls fit coil ranges, and this register's style letters (A/B/D/E) are coil-only, while gas ranges use a separate G-K system this register does not map (Certified, Cycookery — fix 1); covers rest on the cooktop, which Miele broadly warns against ("resting place for anything else") and GE narrows to paper, utensils and food specifically (fix 14); max_heat_temp applies to silicone mats and parts, not metal drip bowls or burner covers (fix 7, 12c). SUPPORTED.

Split 2, `stove_type`:
- **electric coil → ask maker_warning, coil_mount, drip_bowl_style.** Chain: one-piece bowls go under plug-in elements and two-piece pans with rings under hinged elements (Certified blog), and style letters follow brand families (Certified, Cycookery). maker_warning is asked first because it applies to any under-the-pan item reached under electric coil (diffusers, discs), while coil_mount and drip_bowl_style only mean anything for drip bowls and pans specifically; both facets' definitions now say so directly (fix 3). SUPPORTED.
- **gas → ask maker_warning; coil_mount and drip_bowl_style irrelevant.** Chain: this register's drip-bowl letters (A/B/D/E) are coil-specific and do not cover gas ranges, which use a separate, unmapped G-K system (Certified names the letters without detail; Cycookery names specific gas drip pans by brand fit) — so for the purposes of this facet, not because gas ranges cannot have a drip pan at all (fix 1). The maker_warning leg: GE warns against diffusers and rings on gas. SUPPORTED, now graded on its own leg rather than merged with smooth glass top.
- **smooth glass top → ask maker_warning; coil_mount and drip_bowl_style irrelevant.** Chain: a radiant glass top has no coil element for a drip bowl to sit under, so both facets are irrelevant outright, not just unmapped. The maker_warning leg: GE warns against diffusers and rings on glass. SUPPORTED. **2026-10-25: split out of the combined "gas, smooth glass top" branch so each leg's chain is graded separately (fix 1, fix 3).**
- **induction → ask maker_warning, plate_magnetic.** Chain: induction heats only a magnetic base (Miele); a disc works by being magnetic stainless steel (CenturyLife; Wikipedia induction). plate_magnetic (new) asks the magnet-test question directly, since plate_build's four material values do not line up cleanly with magnetism (a stainless/aluminium disc can fall on either side of the magnet test) — fix 8. SUPPORTED.

Split 3, `fit_diameter`: no branches; it is a filter on whatever set the first two leave. Its backfill_note now states the steamer-specific vessel-fit thresholds (ATK) so the "in the pot" leg above does not rest on an unstated mapping (fix 11).

`maker_warning` lookup (what `derived` means for this facet): heat diffuser on gas, coil, radiant or induction → warned (GE); wok ring on gas → warned (GE), on glass → does not heat (GE); induction adapter plate on induction → warned (Miele; GE's diffuser line also names induction); wire trivet on any electric → warned (GE); silicone mat on coil, radiant, induction → warned (GE); anything left resting on a cooktop → warned, broadly by Miele and narrowly (paper, utensils, food) by GE (fix 14). Lids, screens and steamers → not addressed. Only GE and Miele were read; the facet's definition now says explicitly that this checks "any maker read so far", not necessarily the buyer's own stove brand (fix 9) — other makers remain "not addressed" until read.

## Trimmed detail

- `maker_warning`: GE's reason for the wok ring ban on gas is that the ring "acts as a heat trap which may damage the burner grate and burner head"; Wikipedia's reason for using one is that it "concentrates heat". Same physics, opposite verdicts.
- `plate_build`: CooksInfo's double perforated chromed plates "may rust" and "Some are not perfectly flat"; a plate that is not flat adds an air gap, which CenturyLife shows is the problem for discs.
- Induction disc test detail: CenturyLife's paper towel under the disc browned within about six minutes; the copper pan test (three eggs, under five minutes) was "not that bad". One run each.
- Steamer thresholds (ATK only): at least 60 sq in of flat area, a centre handle of at least 3 in, legs of at least 1 in; under 30 sq in is too small. A bamboo tier is about 68 sq in.
- Wok ring orientation: Wikipedia says conical rings go "wide side up" for efficiency. One source; not in the JSON.
- Drip bowl dimensions: Certified Style B small bowl 7-5/8 in across, large 9-3/4 in; Style E small pan 6-1/4 in with a 7-1/2 in ring. Shows why "6 in" names the element, not the bowl.
- USFA: "unattended equipment (37%)" is the leading ignition factor in non-confined home cooking fires; relevant to stove-top covers over a burner someone forgot, but not used as a number in the JSON.

## Dropped

- Chrome versus black porcelain drip bowls as a facet. Certified says chrome "reflects heat" and grimy chrome "absorbs heat"; no second source. Kept here.
- Tempered glass lid breakage. No reachable source.
- A stove-top cover material facet (wood, glass, metal, silicone) as its own filter. `accessory_type` now names "burner or stove-top cover" and "gap cover" as types (2026-10-25 correction below), but a dedicated material facet for them is still thin: Range Kleen's own covers are sold as decorative prints or plain stainless steel with no heat claim, and no gap-cover seller's page could be reached (see "Could not reach" below).
- Lid handle and knob heat ratings. Not reached in any source.

## Scope against the query map (added 2026-10-25, blind check finding 6)

The blind check found query-map terms mapped to this leaf with no family, and one family (drip bowls) with no query-map entry at all. Recorded rather than built out, since none has a sourced spec behind it yet:

- **Grill press / bacon press** (query map, ~100/~50): a weight set on food while it cooks, not a cover, plate or stove protector. No existing family fits; out of scope until a family is researched. Not added as an `accessory_type` value.
- **Pasta insert** (~50): a perforated pot liner for lifting pasta out of boiling water. Mechanically closer to a steamer basket than anything else here, but no source was read on it, so it is noted as an "in the pot" neighbour rather than folded into `steamer_build`'s values.
- **Replacement pot knob** (~50): lid hardware, not the lid itself. Closest to "on the pan" (it replaces a broken part of a universal or replacement lid), but no source was read on sizing or thread standards, so it is out of scope rather than guessed at.
- **Felt pan protectors** (~100): still handed to `kitchen-organizers`, which does not exist yet as a built category. Orphaned until that category is built, as the original notes already said; restated here so the gap is explicit rather than implicit.
- **Stove top cover board** (~50): overlaps `kitchen-boards` (prep surfaces). Kept here under `accessory_type`'s "burner or stove-top cover" value because Range Kleen's own framing is "create extra counter space", a stove-protection use, not a cutting-surface one; a board bought as a cutting surface belongs to `kitchen-boards` instead.
- **Drip bowls**: appear in no query map row read for this register, yet keep their family and two facets. Justification stands as before: the existing add-on's `fits_brand_or_model` field is clearly meant for them, and they are a real, well-documented product line (Certified, Cycookery) with nowhere else to go in the current taxonomy.

## Corrections after the blind check (2026-10-25)

Checker report: `check.md`. Each line names the required fix it answers.

1. (fix 1, CONTRADICTED) Split `stove_type`'s combined "gas, smooth glass top" branch into two separate branches, both still making `coil_mount` and `drip_bowl_style` irrelevant, but for stated reasons that no longer claim gas ranges categorically lack drip pans: this register's A/B/D/E letters are coil-specific and gas ranges use a separate, unmapped G-K system (Certified: "There are other letters that apply to gas ranges such G, H, I, J, and K"; Cycookery's own "Drip pans for gas stoves" section, both re-fetched 2026-10-25). Added a judgement recording that gas drip pans exist but are out of scope for `drip_bowl_style`. Updated `stove_type`'s `why_experts_care`, rationale, and the `certified_drip_products` supports line (it described one listing, not the category).
2. (fix 2, CONTRADICTED) Fixed `amazon_lid_listing`'s reference supports and `max_heat_temp`'s `why_experts_care`/`listing_field_hint`/`backfill_note`: the ELKKNOVE listing does state a rating, "Maximum temperature to 220 degrees Celsius" (about 428 °F), just in °C, not °F. Re-confirmed by the checker against a 2026-07-29 archive snapshot; not re-fetched by me since the checker's quote is already a direct read of the listing. Added a °C-to-°F conversion step to the backfill note.
3. (fix 3, WEAK x2) `coil_mount` and `drip_bowl_style` definitions now state they apply to drip bowls and pans only, not to diffusers, discs or wok rings also reached under electric coil. Reordered the electric-coil branch to ask `maker_warning` first (applies to everything reached there) and the drip-specific facets after. Reworded `plate_build`'s induction sentence out and added a new `plate_magnetic` facet for the induction leg's real reason (magnetism, not material category).
4. (fix 4, misattribution) `plate_diameter`'s `why_experts_care` and `plate_overhang_in`'s `why` now attribute the "disc not matched to pan size uses more energy" claim to Tom's Guide's own reporting, not to "the BSH product manager quoted by Tom's Guide". BSH's own quote (kept separately) is about untested discs interfering with the cooktop's performance standards, not about energy waste from a size mismatch.
5. (fix 5, no type facet) Added `accessory_type` (categorical, derived from the title noun): induction interface disc, heat diffuser, wok ring, drip bowl or pan, burner or stove-top cover, gap cover. Put it first in the `then_ask` lists for "under the pan" and "protecting the stove". Moved "Wok ring" and the two plate-type vocabulary terms to point at `accessory_type` instead of `maker_warning`/`plate_build`. `plate_diameter`'s definition now states it excludes wok rings, which are sized to the wok. Sourced "burner or stove-top cover" from Range Kleen's own Shopify `products.json` (fetched 2026-10-25, curl): "Simply place the covers over your burners... create extra counter space in seconds." "Gap cover" is listed as a value but, per the Scope section above, no seller's page for one could be reached, so it carries no dedicated claim beyond existing.
6. (fix 6, scope) Added the "Scope against the query map" section above, recording grill press, bacon press, pasta insert, replacement pot knob, felt pan protectors, the stove-top-cover-board/kitchen-boards overlap, and the drip-bowl/query-map mismatch, rather than inventing unsourced families.
7. (fix 7, one-source number presented as general) Narrowed `max_heat_temp`'s `why_experts_care`, definition and `range.typical`: GE's 350-450 °F figure is restated as specifically about mats and grill mats resting on a burner, not every silicone part. Frywall's 450 °F and the ELKKNOVE listing's 220 °C (428 °F, see fix 2) are now cited separately as two listing-level data points for the parts themselves, consistent with "numbers resting on one source" in Part A of check.md.
8. (fix 8, `plate_build` not reliably on listings) Changed `plate_build`'s `source` from `listing` to `researched`, raised `backfill_cost` to `medium`, and reworded the backfill note to flag that the one listing read mislabelled a layered (aluminium-cored) disc as "Stainless Steel" in its material row. Added the `plate_magnetic` facet (see fix 3) so the induction leg's real driver, magnetism, is asked directly instead of leaning on `plate_build`'s material categories.
9. (fix 9, `maker_warning` has no brand input) Redefined `maker_warning` as checking against "any stove maker whose manual has been read so far", not the buyer's own stove brand specifically, and said so in `why_experts_care`, `definition` and `listing_field_hint`. This avoids inventing a new range-brand facet while being honest that the lookup is not brand-matched yet (only GE and Miele are read).
10. (fix 10, overstated disagreement) Rewrote the drip-bowl-style judgement's note: Cycookery's page calls Whirlpool-family ranges both Style E and, elsewhere on the same page, Style A, so it is self-inconsistent rather than disagreeing with Certified. Set `sources_disagree` to `false`. Added the same correction to `drip_bowl_style`'s `why_experts_care`.
11. (fix 11, steamer fit mapping unstated) Added the ATK vessel-fit thresholds (collapsible baskets need a pot at least 7.5 in across; 10 in bamboo tiers fit a 12 in skillet or 14 in wok) to `fit_diameter`'s `backfill_note`, so the "in the pot" branch leg rests on a stated mapping rather than an implicit one. Added `atk_steamers` and `atk_bamboo` to `fit_diameter`'s evidence.
12. (fix 12, unstated steps) (a) `mesh_gauge`'s definition and `why_experts_care` now state it applies only when `cover_venting` is mesh splatter screen. (b) `food_contact_compliance`'s definition/`why_experts_care` now state it applies to silicone or rubber parts only (not metal or bamboo steamers), and it was added to the "on the pan" branch's `then_ask` list, since silicone lid rims and splatter walls touch hot fatty food the same way silicone steamer baskets do. (c) `max_heat_temp`'s scope is narrowed per fix 7 to silicone mats and parts, explicitly excluding metal drip bowls and burner covers, rather than resting on an unstated "gap covers and mats" chain.
13. (fix 13, `mesh_gauge` backfill cost and ordinal order) Changed `mesh_gauge`'s `kind` from `ordinal` to `categorical`, since ATK's heavy-vs-thin-wire comparison and Kitchen Professor's silicone-is-poor finding do not establish where "perforated sheet" ranks against wire mesh. Raised `backfill_cost` to `high` and restricted the backfill note to the roughly six screens ATK tested.
14. (fix 14, regulatory gaps) Added a judgement and two new references (Minnesota Statutes 116.943 and Maine Title 38 §1614, both fetched 2026-10-25 by curl) stating that PTFE-coated plates, lids and screens likely count as "cookware"/"cookware product" under both states' PFAS bans (both define it as "durable houseware... to prepare... food... including... cooking utensils"), and that the Amviner plate's own title names "Spray Teflon Paint". Added a `cfr_177_2600` supports line noting the regulation does cap temperature for some non-silicone elastomers (150 °F), just not silicone, and narrowed the existing "FDA-compliant silicone" judgement's note to say so. Dropped "or the EU equivalent" from `food_contact_compliance`'s definition — no EU measure specific to silicone was found or cited, so the uncited phrase was removed rather than backed. Labelled `miele_induction_manual`'s title "(en-AU/NZ, M.-Nr. 11 274 120)". Rewrote the "resting on the cooktop" judgement to attribute the broad "anything" wording to Miele and the narrower "paper products, cooking utensils or food" wording to GE, rather than treating them as saying the same thing.

No findings were rejected. All fourteen required fixes were applied in some form; where a full new facet was not warranted by the available sources (gas drip-pan style letters in detail, a gap-cover spec), the register says so explicitly in the Scope section above rather than silently dropping the finding.

### Sources fetched for this correction pass (2026-10-25)

- Minnesota Statutes 116.943 (curl, revisor.mn.gov) — verbatim: `"Cookware" means durable houseware items used to prepare, dispense, or store food, foodstuffs, or beverages. Cookware includes but is not limited to pots, pans, skillets, grills, baking sheets, baking molds, trays, bowls, and cooking utensils.` and `Beginning January 1, 2025, a person may not sell, offer for sale, or distribute for sale in this state the following products if the product contains intentionally added PFAS: ... (3) cookware...`.
- Maine Revised Statutes, Title 38 §1614 (curl, mainelegislature.org) — verbatim: `"Cookware product" means a durable houseware product intended to be used to prepare, dispense or store food, foodstuffs or beverages, including, but not limited to, a pot, pan, skillet, grill, baking sheet, baking mold, tray, bowl and cooking utensil.` and `effective January 1, 2026, a person may not sell, offer for sale or distribute for sale in this State: ... (2) A cookware product containing intentionally added PFAS...`.
- 21 CFR 177.2600 (curl, Cornell LII, re-fetched) — verbatim, confirming the temperature-cap nuance: a polyamide/polyester copolymer elastomer "may be used in contact with foods... at temperatures not to exceed 150 °F", a cap the silicone entries in the same section do not carry.
- Certified Appliance Accessories drip-pan guide (curl, re-fetched) — verbatim: `There are also Styles C and F for electric ranges, but they are not as widespread. There are other letters that apply to gas ranges such G, H, I, J, and K.`
- Cycookery drip-pan guide (curl, re-fetched) — verbatim: a "Drip pans for gas stoves" section naming "Chrome Square Gas Range Drip Pan" ("designed to fit specific GE, AP2028207, PS244863, and WB32X90 stove models") and "Range Kleen Gas Range Drip Pans".
- Range Kleen `products.json` (curl, rangekleen.com; the `/collections/burner-kits` listing page itself 404s with no products, so the site-wide `products.json` was read instead) — verbatim, "550-4 4pk Round Stainless Steel Burner Cover Set": `Hide those worn-out elements and create extra counter space in seconds`; a related decorative-cover listing: `Simply place the covers over your burners. They are just as easy to remove when you're ready to cook.`

### Could not reach (this pass)

camco.com (DNS/timeout), linda-silicone.com, kindgasilicone.com, silicovers.com, stovegapcover.com (404 or no resolution) — all guessed domain names while looking for a seller of silicone stove gap covers specifically. No gap-cover product page was found; see the Scope section above for how that gap is handled. WebSearch could not be used for any of this (shared session budget already exhausted), so all of the above was read by curl against known or guessed URLs only.

## Numbers in category.json and how many sources stand behind each

| Number | Sources |
|---|---|
| Silicone mats commonly rated 350 to 450 °F (on a burner, GE's figure specifically) | GE support page (verbatim, 350 to 450 °F for mats and grill mats) |
| Silicone parts themselves (lid rims, splatter walls) commonly rated near 428 to 450 °F | Frywall (verbatim, 450 °F); Amazon ELKKNOVE listing (verbatim, "220 degrees Celsius" ≈ 428 °F) — two listing-level data points, kept separate from GE's mat-specific figure (2026-10-25 correction, fix 2 and 7) |
| A flat (about 13 in) mesh screen sits on 8 to 12 in skillets | ATK splatter review (verbatim: fit 12 in, sits on 8 or 10 in; winner titled "13 Inch"); Kitchen Professor (verbatim: 13 in screen "fits 8 inch 10 inch, and 12 inch skillets") |
| Drip bowls sold as 6 in and 8 in, naming the element size | Certified blog and product data (verbatim); Cycookery (fetched excerpt, "most common sizes are 6-inch and 8-inch") |
| Collapsible steamer baskets need a vessel at least 7.5 in across; bamboo tiers (about 10 in) fit a 12 in skillet or 14 in wok | ATK collapsible-steamer review (verbatim) and ATK bamboo-steamer review (verbatim) — one organisation, two separate reviews; added to `fit_diameter`'s backfill_note 2026-10-25, fix 11 |
| 10.5, 11 and 12 in (example of a stated universal-lid span) | Amazon ELKKNOVE listing (verbatim); used only as an example of the field format, not as a threshold |
| 9.45 in and 8 in (examples of plate sizes in titles) | Amazon Amviner listing (verbatim); CenturyLife names the "Max Burton 6010 8-Inch Induction Interface Disk" (verbatim); field-format examples only |
| 21 CFR 177.2600 | The regulation itself (Cornell LII, verbatim); re-fetched 2026-10-25 and found it also caps temperature at 150 °F for some non-silicone elastomers (fix 14) |
| Minnesota and Maine both ban "cookware"/"cookware product" containing intentionally added PFAS (Jan 1 2025 / Jan 1 2026) | Minnesota Statutes 116.943 (verbatim) and Maine Title 38 §1614 (verbatim), both fetched 2026-10-25; added as a judgement, fix 14 |

Numbers kept out of the JSON because only one source carries them: CenturyLife's 8 min 40 s versus about 19 min and 0.22 versus 0.41 kWh; ATK's steamer thresholds (60 sq in, 3 in handle, 1 in legs, 30 sq in floor) and the 68 sq in bamboo tier; Certified's bowl dimensions; USFA's 37 percent unattended-equipment figure.

## Script notes and build log

- `schema.json` restricts `vertical` to formulations, machines, fashion, furnishing, other. The brief asked for `supplies`; with `"vertical": "supplies"` the validator reported `schema  vertical: 'supplies' is not one of ['formulations', 'machines', 'fashion', 'furnishing', 'other']`. The skill's scripts and schema were not modified (per the brief); category.json uses `"vertical": "other"` so that validate, render and viewer run clean. The taxonomy vertical (`supplies`) is recorded in `catalog.json` and in the scope line above. If the schema gains `supplies`, change this one field and rebuild.
- validate.py, render.py and viewer.py then ran clean. The skill's `tests/viewer-browser.py` was run against a temporary copy of viewer.html in the scratchpad (1380, 768 and 390 px, light and dark, offline): 6 of 6 PASS. At 1380 px the four-way flowchart is wider than its container and scrolls horizontally, as the viewer design intends; the branch skip lists were trimmed to the facets a branch would otherwise reach, to keep the nodes short.