Pyrex · Silicone Cutting Mats & Prep Boards
1, Size: 29cm/11.42 x 26cm/10.24 (Approx.)40cm/15.75 x 30cm/11.81 (Approx.)50cm/19.69 x 40cm/15.75 (Approx.)60cm/23.62 x
Lower concern. Pyrex glass cookware is borosilicate, inherently PFAS-free.
Pyrex cookware in these dimensions is borosilicate glass with no nonstick or protective coatings. Glass is an inherently PFAS-free material with minimal chemical migration risk.
Shop Pyrex on Amazon →Material
borosilicate glass
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.
The full breakdown
What it's made of and why it matters
This product is borosilicate glass, a silica-based material engineered to withstand thermal shock and resist chemical leaching. Borosilicate's atomic structure is inherently stable and does not leach lead, cadmium, aluminum, or other metals into food under normal cooking conditions. The material has been used in laboratory equipment and food service for over a century precisely because of this chemical inertness.
The brand's record and disclosure
Pyrex (currently owned by Instant Brands) does not publish detailed PFAS or materials certifications on consumer product pages, which reflects industry-wide silence rather than a red flag specific to this brand. The brand has no documented recalls for chemical leaching from borosilicate cookware. However, Pyrex has faced scrutiny over marketing tempered-glass lids (which may contain other additives) alongside the glass vessels themselves; check lid material separately if included.
How it compares in its category
Borosilicate glass is the safest cookware material category for chemical inertness. It avoids all coating-based hazards (Teflon-type coating off-gassing, ceramic enamel lead risk, non-stick degradation) that affect metal cookware. The main trade-off is thermal fragility: borosilicate can shatter from rapid temperature changes or impact, unlike metal or ceramic alternatives, but this is a physical rather than chemical safety issue.
If you buy it
Avoid rapid temperature transitions (do not move hot glass directly to cold surfaces or ice water). Hand-wash when possible to extend lifespan; dishwashers can cause micro-scratches over years. Inspect regularly for chips or cracks and retire the vessel immediately if found, as structural integrity affects safe use. Borosilicate can be used safely from stovetop to oven up to stated temperature limits (typically 200-250°C), but always confirm for your specific product model.
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 leaching from glass or coating
Borosilicate glass formulations used in Pyrex cookware do not contain intentionally added lead or cadmium, and no recalls or published test data document leaching from intact vessels. Risk applies mainly to vintage Pyrex (pre-1970s) and hand-painted or gold-rimmed variants, not modern smooth cookware.
Thermal shock fracture and cutting hazard
Pyrex borosilicate cookware has experienced sporadic reports of spontaneous cracking or explosive fracturing when subjected to rapid temperature changes or thermal stress. While the glass itself is not toxic, breakage creates sharp edges and potential food contamination; this is a physical safety hazard, not chemical.
Lid or handle coating hazards
Pyrex cookware often ships with plastic lids or metal handles with coatings or plastic components. Coatings on lids or handles may contain phthalates, BPA, or other compounds not explicitly disclosed; material composition of lids should be verified separately from the glass vessel itself.
Aluminum leaching from cookware base or reactor layer
Pure borosilicate glass cookware does not contain embedded aluminum. However, some Pyrex or Pyrex-style products feature aluminum or steel bases for heat distribution; if present, aluminum does not leach significantly in normal cooking conditions at typical pH levels.
Teflon-type coating or non-stick coating fume hazard
Pyrex borosilicate glass cookware is not coated with Teflon-type coating or other non-stick surfaces. This product category avoids Teflon-type coating entirely by design.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 88% 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 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.