Williams Sonoma · Pizza Stones & Baking Surfaces
Williams Sonoma OPEN BOX Emile Henry French Ceramic Pizza Stone
Lower PFAS concern. Material as recorded is not linked to PFAS.
This pizza stone is ceramic stoneware with no coating on record. The material as recorded is not associated with PFAS. Williams Sonoma has no PFAS statement on record for this product.
The better-graded swap
15-Inch Ceramic Pizza Stone for Perfect Crispy Crusts
90/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Ceramic (Emile Henry stoneware)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Glaze degradation and crazing over time
Thermal cycling and rapid temperature changes can cause fine cracks in the glaze, which may harbor bacteria or allow contact with unglazed clay underneath. This is a normal wear issue for ceramic pizza stones with age and heavy use, not a manufacturing defect. Proper care and thermal management minimize risk.
Microbial growth in porous material
Unglazed or cracked areas of ceramic can trap moisture and food particles, creating conditions for mold or bacterial colonization if stored damp. Regular drying and inspection reduce this risk significantly.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
No recalls or documented contamination reported for Emile Henry ceramic cookware. Ceramic glazes sold in North America and EU are subject to FDA limits (less than 0.5 mg/L leachable lead). No test results are publicly available for this specific product, but the brand's long market history and lack of recalls suggest compliance.
Source, ATSDR ↗Aluminum leaching
Not applicable. Emile Henry stoneware is ceramic, not aluminum-based, so no aluminum leaching risk exists.
Teflon-type coating/Teflon-family coating fume release
Ceramic pizza stones do not use nonstick coatings, so Teflon-type coating fume risk is absent. This is a key safety advantage over Teflon-type coating-coated cookware.
The full breakdown
What it's made of and why it matters
Emile Henry stoneware is high-fired ceramic (earthenware base, often clay and silica) glazed with food-safe ceramic glaze. Unlike metal or coated cookware, ceramic pizza stones rely on thermal mass and porosity rather than nonstick coatings, eliminating Teflon-type coating and Teflon-family coating fume risks. The glaze (typically silica-based) is chemically stable under normal cooking heat (up to 500 degrees F) and does not leach into food when intact.
The brand's record and disclosure
Emile Henry is a French heritage cookware maker with decades of market presence and no documented safety recalls or glaze contamination issues in public records. The brand does not prominently publish heavy-metal testing or regulatory certifications on their consumer-facing materials, though ceramic cookware in the EU and North America faces standard lead/cadmium limits. Williams Sonoma's private-label sourcing practices are not fully transparent, but Emile Henry products sold through major US retailers generally comply with FDA cookware standards.
How it compares in its category
Ceramic pizza stones have lower concern because they lack a nonstick coating, enamel layer, or metal substrate that can degrade or leach. This contrasts with enameled cast iron (enamel crack risk), metal baking sheets (aluminum or steel leaching under acidic foods), and most nonstick pans (Teflon-type coating degradation). Ceramic stones are also chemically inert once cured and do not off-gas volatile compounds the way some polymer or metal-composite cookware can.
If you buy it
Avoid thermal shock, preheat slowly in the oven and never place a hot stone on a cold surface or rinse it immediately after use. Do not use on direct stovetop heat. Inspect the glaze annually for crazing (fine cracks) or visible damage; if present, retire the stone as micro-crazing can trap bacteria and foods may contact unglazed clay. Hand wash only; dishwasher exposure can degrade the glaze over time. Store in a dry location to prevent mold growth in the porous ceramic.
What we don’t know
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Williams Sonoma has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Pizza Stones & Baking Surfaces
15-Inch Ceramic Pizza Stone for Perfect Crispy Crusts
Ceramic (clay-based baking stone)
Glaze degradation and surface leaching
Limited concern
Thermal stress fracture
High concern
Microporosity and microbial retention
Limited concern
Brand PFAS statement on record, which we have not verified.
⚠Starting grade for this product type
Deluxe Square Pizza Stone with Rack
ceramic or unglazed stone; no nonstick coating
Ceramic or stone cracking and fragmentation
Limited concern
Porous surface harboring bacterial or mold growth
Limited concern
Brand PFAS statement on record, which we have not verified.
⚠Starting grade for this product type
Baking Steel
The Original Ultra Conductive Pizza Stone
carbon steel (bare metal, no coating)
Rust and corrosion
Limited concern
Thermal safety and burns
Moderate concern
Lower concern; bare carbon steel has no PFAS-prone coatings.
⚠Starting grade for this product type
More pizza stones & baking surfaces grades
How we score, every product runs through the same public 0-100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.