Pyrex · Silicone Cutting Mats & Prep Boards
Rockler Silicone Project Mat
Silicone project mat carries low concern; no coating risk.
Silicone is an inherently PFAS-free elastomer not typically treated with fluorochemicals. No known PFAS concern, though the brand makes no explicit claim.
We flunk more products than we pass. This one earned its grade. How we grade
Material
silicone
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
PFAS exposure happens more often with clothing products.
Bacterial or mold growth if unmaintained
Silicone surfaces are nonporous and resist microbial colonization better than cloth or wood. However, if mat is stored wet or in warm, humid conditions, mildew could develop on the surface; regular drying and ventilation prevent this.
Migration of manufacturing residue or plasticizers
Some silicone products retain manufacturing oils or uncrosslinked oligomers that may transfer to food if the mat is not washed before first use. This is a quality-control issue, not an inherent material risk; one pre-use wash mitigates it.
What’s reassuring
Safe base material
Made from ceramic, mineral, or natural fiber with no PFAS risk.
Silicone leaching
Food-grade silicone is chemically inert at room temperature and does not leach oligomers into food or water under normal use. No established health risk from this material class in peer-reviewed literature or regulatory action.
Coating degradation over time
Silicone is not a coating; it is the bulk material itself. It does not peel, chip, or flake like ceramic glazes or non-stick Teflon-type coating films, so no risk of ingesting foreign particles from surface failure.
Lead
This hazard applies to glazed ceramics and enameled iron, not silicone. Pyrex silicone mats are not decorated with pigmented glazes or metal-containing dyes, so no exposure route exists.
Source: ATSDR ↗The full breakdown
What it's made of and why it matters
This product is a silicone work surface, not cookware that contacts heat directly during cooking. Food-grade silicone is a synthetic rubber polymer that does not leach into food or liquids at room temperature, unlike glazed ceramics or non-stick coatings. Silicone mats are inert and resistant to degradation from normal kitchen use, cutting, and washing. The material has no volatile compounds that off-gas under typical conditions.
The brand's record and disclosure
Pyrex is owned by Instant Brands and has a long history in cookware safety, though formal PFAS disclosure is limited across their product range. No major recalls or safety controversies specific to silicone project mats have been documented. Pyrex's silence on PFAS reflects industry-wide opacity rather than a known problem with this particular product line.
How it compares in its category
Silicone project mats are safer than traditional glazed ceramic or stoneware work surfaces, which may contain lead or cadmium in decorative coatings. They avoid the Teflon-type coating fume risk of non-stick cookware and do not degrade like plastic cutting boards that shed microplastics. Silicone is also more durable than cloth work mats, which can harbor bacteria and are harder to sanitize.
If you buy it
Wash the mat by hand or in the dishwasher before first use to remove manufacturing residue. Store flat or rolled to prevent creasing that could trap bacteria. Replace only if surface becomes sticky, stained, or visibly torn; silicone does not degrade on a typical timeline. Avoid placing it directly on high heat (above 400F), though the mat itself is heat-resistant up to 450F for brief contact.
What we don’t know
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Pyrex has made none
Formulations change between production runs, so check the current label. How we grade.
More silicone cutting mats & 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.