· Pizza Stones & Baking Surfaces
Pizza Stone 20 X 14 X 0.67 In. Rectangular Cordierite Baking Stone, Is It Non-Toxic?
Cordierite ceramic presents minimal PFAS risk.
Cordierite is a mineral ceramic with no documented PFAS connection. Pizza stones don't require water-repellent or grease-resistant treatments that introduce PFAS.
The better-graded swap
Deluxe Square Pizza Stone with Rack
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
Cordierite ceramic baking stone
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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Is Pizza Stone 20 X 14 X 0.67 Baking Stone non-toxic? What it is made of
This pizza stone is made from cordierite, a magnesium aluminum silicate ceramic that is fired at high temperature to create a porous, heat-retaining surface. Cordierite is chemically inert at normal cooking temperatures (up to ~500°C) and does not leach heavy metals, lead, or cadmium as some glazed ceramics do. The porous structure allows moisture to wick away, improving crust texture without requiring seasoning or oil. Unlike unglazed ceramic tiles or some decorative stoneware, food-grade cordierite is specifically formulated to withstand thermal shock and repeated heating cycles.
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.
Thermal shock and breakage
Cordierite is brittle and can crack if exposed to rapid temperature changes or thermal stress; breakage does not release toxic substances but creates sharp edges and loss of function.
Bacterial or mold growth in pores
The porous structure can trap moisture and food particles if not properly dried after use; improper cleaning may allow microbial growth, though this is a hygiene issue rather than a material toxicity issue. Dry thoroughly after use.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
Food-grade cordierite formulations do not intentionally contain lead or cadmium; no contamination has been reported for Matfer products. Unglazed ceramic surfaces carry no surface glaze risk.
Source, ATSDR ↗Coating degradation or glaze hazards
This product is unglazed cordierite ceramic; there is no enamel, glaze, or coating layer to chip, degrade, or leach substances into food.
Aluminum or silicate leaching at high pH or acidic conditions
Cordierite is chemically stable across normal cooking pH ranges (3-9) and does not leach aluminum or silicate into food at typical oven temperatures. High-acid foods (tomato sauce) on the stone surface for extended time post-cooking carry no documented risk.
How is this PFAS grade calculated?
The brand's record and disclosure
The brand is a French professional cookware and baking equipment manufacturer with a long industrial history (founded 1814) and strong presence in commercial kitchens. The brand does not publicly disclose detailed material safety testing or third-party certifications for this specific product line, but the company maintains CE marking for food contact items and operates under European manufacturing standards. No significant recalls, contamination incidents, or safety controversies have been established for Matfer cordierite baking stones in public records.
How it compares in its category
Cordierite pizza stones are considered the industry standard for home and professional use, offering superior thermal performance and durability compared to unglazed ceramic tiles, which can crack more easily and may contain uncontrolled lead in raw clays. They have lower concern than some cheaper ceramic alternatives that use decorative glazes or finishes with unknown composition. Compared to cast iron or steel stones, cordierite requires no seasoning and poses no rust or iron leaching concerns, though it is more fragile if dropped.
If you buy it
Preheat the stone slowly at low temperature (100°C) for 10-15 minutes before raising heat, as rapid temperature swings can cause cracking due to thermal shock. Do not immerse it in water or use soap; wipe with a dry brush or cloth while warm to remove residue. Place it on the lowest oven rack to distribute heat and protect it from falling items. Replace it if visible cracks develop, as they can propagate and the stone may fail suddenly at high temperature.
What is not known about PFAS in this product?
- Basis
- Model estimate, 88% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Pizza Stone 20 X 14 X 0.67 In. Rectangular Cordierite Baking Stone?
15-Inch Ceramic Pizza Stone for Perfect Crispy Crusts
- Ceramic (clay-based baking stone)
- The brand calls it PFAS-free, which we have not verified
- Glaze degradation and surface leaching
3 hazards checked on this product, all on its full breakdown.
Deluxe Square Pizza Stone with Rack
- ceramic or unglazed stone; no nonstick coating
- The brand calls it PFAS-free, which we have not verified
- Ceramic or stone cracking and fragmentation
2 hazards checked on this product, all on its full breakdown.
- carbon steel (bare metal, no coating)
- We found no PFAS statement from the brand
- Rust and corrosion
2 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonMore 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.