Pyrex · Silicone Cutting & Prep Boards
Craft Smart Glass Clay Cutting Mat
Lower concern. Glass mat has no known PFAS risk.
Craft Smart cutting mats are borosilicate glass with no nonstick or water-resistant coating. Glass itself does not contain PFAS. No brand disclosure found on this category.
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Material
Borosilicate glass cutting mat surface
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
cookware is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
This product is a borosilicate glass cutting surface, not a cooking vessel. Borosilicate glass is chemically inert and does not leach lead, cadmium, aluminum, or other metals into food or liquid contact under normal use. The material is kiln-fired and stable; no thermal coating, enamel, or glaze is involved, eliminating the primary leaching pathways found in traditional cookware. Glass cutting mats are passive tools for dry food prep, not heat-exposed surfaces, further reducing any chemical release risk.
The brand's record and disclosure
Pyrex is owned by Instant Brands and has maintained a long-established reputation for borosilicate glass cookware safety. The brand does not currently publish a detailed PFAS elimination stance, but has not been named in major product safety recalls related to chemical leaching in recent years. Pyrex cookware products have been tested independently and show low heavy metal contamination profiles. As a glass tool product (not coated or enameled), PFAS exposure from this mat is not a known concern in the product category.
How it compares in its category
Glass cutting mats are inherently safer than silicone, plastic, or wood alternatives for chemical inertness. Unlike silicone mats, glass does not off-gas volatile compounds or degrade into microplastics with wear. Unlike plastic mats, it has no BPA, phthalate, or polymer breakdown risk. The tradeoff is brittleness and weight; glass mats require careful handling and do not absorb impact like softer materials, but this is a physical hazard, not a chemical one.
If you buy it
Store and handle with care to prevent cracks or chips; check the mat surface periodically for damage and discard if broken (glass shards pose a physical safety risk). Clean with warm soapy water or place in the dishwasher as directed; borosilicate glass is durable and does not require special maintenance. Avoid extreme thermal shock (do not move directly from heat to cold water), although cutting mats are not typically heat-exposed. Replace if surface chips develop or if glass becomes cloudy and opaque, which may indicate micro-fracturing.
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.”
Lead or cadmium in surface coatings or glazes
Borosilicate glass cutting mats have no glaze, enamel, or ceramic coating; the glass itself is the working surface. No lead or cadmium risk is documented for this product type or Pyrex brand in this category.
Teflon-type coating (Teflon) fume risk
This is a glass cutting mat used for dry food prep, not a non-stick cookware product. No Teflon-type coating is present; no fume inhalation hazard applies.
Aluminum leaching
Borosilicate glass does not contain aluminum as a functional element and does not leach aluminum. This hazard is relevant to aluminum cookware and mixing bowls, not glass mats.
Coating degradation and flaking
Glass mats can crack or chip with impact or mishandling, producing sharp glass fragments. This is a physical safety concern (laceration risk) rather than a chemical one, but warrants inspection before use if the mat has been dropped.
Microplastic generation or polymer breakdown
Borosilicate glass is inorganic and inert; it does not degrade into microplastics or release polymer fragments. This hazard applies to silicone and plastic mats but not to glass.
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.
More silicone cutting & prep boards 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.