Baking Steel · Pizza Stones & Ceramic Bakeware
King Arthur Bread and Pizza Stone
Lower concern, seasoned carbon steel has no PFAS-prone coatings.
Baking Steel's bread and pizza stone is uncoated carbon steel seasoned with mineral oil, a material with no known PFAS risk. The brand makes no PFAS claims, but seasoned carbon steel cookware does not require Teflon-family coating or water-repellent coatings. This is a standard, non-toxic approach to baking surfaces.
Shop Baking Steel on Amazon →Material
Carbon steel with food-grade mineral oil seasoning
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cookware is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
This is a 1/4-inch carbon steel slab seasoned with food-grade mineral oil, not ceramic, enameled cast iron, or non-stick coated. Carbon steel itself is chemically inert at normal baking temperatures (up to 500°F+) and does not leach metals or degrade into particles. The mineral oil seasoning is a passive protective layer that burns off slightly with each use and is simply replaced; it is not a synthetic polymer coating prone to flaking, off-gassing, or thermal breakdown. Unlike ceramic pizza stones, this product has no glaze, enamel, or decorative coating to chip and no Teflon-type coating or ceramic non-stick layer to deteriorate.
The brand's record and disclosure
Baking Steel is a smaller, direct-to-consumer cookware brand with no major product recalls or regulatory actions in public databases. The company does not publish detailed safety certifications or material specifications on food-contact claims, and takes no visible public stance on PFAS or heavy metal testing. This silence is typical for carbon steel cookware makers and does not indicate a problem; it reflects the material's inherent safety profile rather than a disclosure gap. No third-party testing or independent recalls of this model are on record.
How it compares in its category
Carbon steel pizza stones are a middle ground between unglazed ceramic (fragile, can leach silica dust if cracked) and ceramic or enameled cast iron (glaze flaking and lead/cadmium concerns in older or lower-cost variants). Baking Steel's product avoids the most common hazard in this category: cracking ceramics that shed particles and the coating degradation risks of enameled or non-stick stones. It requires seasoning maintenance like cast iron but is lighter and more durable than ceramic, making it a safer choice for high-use home baking.
If you buy it
Season and maintain the surface with a thin coat of food-grade mineral oil or high-heat vegetable oil after each use to prevent rust and preserve the non-stick layer. Do not exceed 500°F, as mineral oil will smoke and degrade at higher temperatures, and do not use abrasive scouring that strips seasoning. Hand wash with hot water and a soft brush; the seasoning layer is self-healing with proper use. Replace only if the steel itself rusts through (rare with maintenance) or develops deep pitting that cannot be re-seasoned; the mineral oil itself carries no toxicity at food-contact temperatures.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Mineral oil food contact safety
Food-grade mineral oil used for seasoning is approved by the FDA for incidental food contact and is not absorbed by baked goods; no health hazard is established at normal cooking temperatures.
Iron leaching
Carbon steel can release trace iron ions into food, especially acidic foods or liquids; this is negligible for bread and pizza (low moisture, neutral pH) but may be higher with tomato sauce or proofing dough at room temperature for extended periods. Iron is an essential mineral, and leaching levels from carbon steel are within safe intake ranges.
Rust and corrosion
If seasoning is stripped or maintenance is neglected, bare carbon steel will rust; ingested rust oxide is not acutely toxic but indicates surface degradation and loss of the protective layer. Rust is preventable with standard seasoning protocol and is a maintenance issue, not a manufacturing defect.
Thermal cracking or warping
Rapid temperature changes (e.g., placing a cold stone directly on a hot oven rack or immersing it in water after use) can cause stress cracks or warping; this affects function but does not create a chemical hazard, as the material itself is inert even if fractured.
Lead or cadmium in steel
No recalls, testing reports, or complaints linking this product or carbon steel pizza stones to heavy metal contamination are on public record; carbon steel in food-contact applications is not a known source of lead or cadmium leaching.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Pizza Stones & Ceramic Bakeware
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Lower-concern option; GreenPan's ceramic nonstick has public PFAS-free positioning and MADE SAFE backing, though full chemical transparency remains limited.
⚠Risky category by default
Caraway
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ceramic nonstick coating
Lower concern; ceramic nonstick with credible PFAS-free claim and third-party backing.
⚠Risky category by default
Caraway
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ceramic nonstick coating
Lower-concern ceramic nonstick option with transparent PFAS-free positioning and third-party backing.
⚠Risky category by default
More pizza stones & ceramic bakeware 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.