Fox Run · Pizza Stones & Baking Surfaces
Fox Run 3916 Square Pizza Stone 14" x 15"
Lower PFAS concern with uncoated ceramic pizza stone requiring no Teflon-family coating treatments.
Fox Run's pizza stone is made of cordierite ceramic, a porous uncoated material needing no PFAS-based nonstick or water-repellent coatings. Pizza stones carry inherently low PFAS exposure risk.
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 stone
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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Is Fox Run 3916 Square Pizza Stone 14" x 15" non-toxic? What it is made of
The Fox Run 3916 is made from cordierite ceramic, a mineral compound (magnesium aluminum silicate) engineered to withstand thermal shock from direct oven heat. Cordierite is naturally porous and stable at high temperatures (typically rated to 500+ degrees Fahrenheit), which allows moisture to absorb and release during pizza baking while minimizing coating breakdown. Unlike glazed ceramic or non-stick coated surfaces, uncoated cordierite requires no Teflon-type coating, silicone, or other Teflon-family coating to function, eliminating fume risk at normal cooking temperatures.
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.
Mineral leaching from cordierite base material
Cordierite is chemically stable and non-soluble at typical use temperatures and pH levels of food. Leaching of magnesium, aluminum, or silica from intact cordierite into food is not established as a documented concern in published safety literature, though minute mineral presence in porous materials is inherent.
Bacterial growth in porous surface if moisture retained
The porous nature of cordierite can trap moisture if stored damp; prolonged moisture retention in a warm environment could theoretically support microbial growth. Proper drying and storage in a dry location mitigates this risk substantially.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Lead
Uncoated cordierite pizza stones do not use glazes or enamel finishes, eliminating glaze-based lead and cadmium risk. No reports of contamination in cordierite pizza stone category from mineral composition alone.
Source, ATSDR ↗Teflon-type coating fume risk (non-stick coatings)
This product has no non-stick or Teflon-family coating, so Teflon-type coating off-gassing does not apply. Cordierite alone is not a fluorine-containing material and does not release toxic fumes at standard pizza-baking temperatures (under 500 degrees Fahrenheit).
Coating degradation and flaking over time
Uncoated cordierite does not degrade into flaking fragments like glazed or non-stick surfaces do. Surface wear is primarily cosmetic; structural failure comes from cracking under thermal stress, not layer breakdown.
The full breakdown
The brand's record and disclosure
Fox Run is a privately held cookware manufacturer based in Ohio with no public PFAS commitment or third-party certifications on file. The brand does not prominently disclose material sourcing or safety testing for individual products, though cordierite pizza stones are a commodity item with minimal brand-specific chemical risk. No recalls or safety controversies specific to this model or Fox Run pizza stones are documented in public records.
How it compares in its category
Uncoated cordierite pizza stones like this one represent the lower-hazard baseline in the category. Many competing stones add glazes, enamels, or non-stick coatings that introduce lead, cadmium, or Teflon-type coating concerns; some cheaper models use fired clay with unstable glazes prone to chipping and leaching. Cordierite's natural durability and resistance to thermal cracking mean this product typically outlasts competitors and requires no replacement due to coating failure.
If you buy it
Preheat the stone gradually (place it in a cold oven and raise temperature slowly) to prevent thermal shock cracking; avoid washing with cold water immediately after use. Hand wash only; do not use a dishwasher or expose to sudden temperature changes. Inspect the surface annually for visible cracks or chips; a small chip does not require replacement, but deep cracks compromise performance and may harbor bacteria in pores. Store in a dry location to prevent moisture absorption that can expand and weaken the stone over time.
What we don’t know
- Basis
- Model estimate, 78% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Fox Run has made none
Formulations change between production runs, so check the current label. How we grade.
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3 hazards checked on this product. See all of them.
Deluxe Square Pizza Stone with Rack
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2 hazards checked on this product. See all of them.
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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.