Old Stone · Pizza Stones & Baking Surfaces
Old Stone Glazed Cordierite Square Pizza Stone 4 Piece Set, Is It Non-Toxic?
Lower PFAS concern; uncoated stone is inherently low-risk.
This pizza stone is glazed cordierite, a mineral ceramic with no inherent PFAS exposure pathway because it's not nonstick coated or treated with water or grease repellents. Lagostina doesn't disclose PFAS practices, but material composition poses lower risk.
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
Glazed cordierite stone (ceramic mineral)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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Is Old Stone Glazed Cordierite Piece Set non-toxic? What it is made of
Cordierite is a naturally occurring ceramic mineral (magnesium aluminum silicate) that is thermally stable and crack-resistant, making it ideal for pizza stones. The product is glazed, meaning a glass-like coating covers the surface. Cordierite itself does not leach metals or break down into microplastics under normal baking temperatures (up to 500F is typical for pizza stones). The glaze quality determines whether lead, cadmium, or other contaminants could migrate into food, but no testing issues have been publicly reported for this specific product line.
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 cracking (structural failure)
Cordierite is durable but can crack if subjected to rapid temperature changes or thermal cycling. Cracking can expose unglazed interior ceramic, which is porous and may retain bacteria or absorb liquids if not dried promptly.
Glaze degradation over time
Repeated heating cycles and moisture exposure can cause crazing (fine surface cracks) or peeling of the glaze coating. This is a wear-and-tear issue rather than a manufacturing defect; inspection is needed to catch it early.
Bacterial or mold colonization in pores
Unlike non-porous surfaces, cordierite absorbs water in small cracks or crazes if not dried thoroughly. Damp storage or incomplete cleaning can allow mold or bacterial growth, though this is preventable with proper maintenance.
Unglazed component contamination (spatula or handles if included)
The four-piece set may include metal or plastic accessories; if plastic (e.g., silicone handles or a plastic spatula), they should be checked separately for phthalate or BPA risk, especially if exposed to heat during use.
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 safety alerts on record for Lagostina cordierite pizza stones. Standard commercial glazes on cookware-grade stones are typically lead-free, but the brand does not publish glaze specifications. The risk is low for this product category and manufacturer.
Source, ATSDR ↗How is this PFAS grade calculated?
The brand's record and disclosure
Lagostina (owned by Groupe SEB, a French cookware conglomerate) does not publicly emphasize PFAS avoidance or provide detailed material safety certifications for this stone product. The brand has no known recalls or safety controversies tied to cordierite baking stones. For glazed ceramics, Lagostina products are not flagged in FDA warning databases or consumer safety alerts regarding heavy metal leaching from this category.
How it compares in its category
Cordierite stones present lower concern than unglazed terracotta or clay stones, which can absorb oils and harbor bacteria if poorly maintained. They are comparable to other branded cordierite stones (Emile Henry, Le Creuset, KitchenAid) in material composition. Unlike cast iron or steel pizza pans, cordierite avoids iron leaching concerns. The four-piece set format (likely including a serving spatula or stand) is standard; the non-stone components should be inspected separately if made of plastic or metal.
If you buy it
Preheat the stone gradually (at least 30 minutes) to avoid thermal shock and cracking, which can expose unglazed edges. Do not use soap or submerge the stone immediately after use; allow cooling and wipe with a damp cloth to avoid moisture absorption into micro-cracks. Inspect the glaze annually for chips or crazing; a visibly damaged glaze warrants replacement to prevent uncontrolled leaching. Store in a dry place to prevent mold growth in the porous ceramic body.
What is not known about PFAS in this product?
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Old Stone has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Old Stone Glazed Cordierite Square Pizza Stone 4 Piece Set?
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.