Pyrex Review, Is Pyrex Non-Toxic?
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Across 12 graded products, Pyrex averages Good (69/100). On disclosure, the brand says nothing publicly about PFAS. 9 of its products grade Good or better. Grades are model-based estimates, not lab results.
Worth buying from Pyrex Good or better, safest first
Pyrex
Glass Meal Prep Set
borosilicate glass with metal lids (likely stainless steel or aluminum)
Metal lid corrosion and leaching
Stainless steel and aluminum lids can corrode if exposed to acidic foods (tomato sauce…
Silicone or rubber gasket degradation
Gaskets in Pyrex meal prep lids can absorb odors, stain, or crack after 2-5 years of…
Thermal shock fracture from glass
Borosilicate glass is durable but will crack or shatter if exposed to sudden extreme…
Lower PFAS concern; glass meal prep containers are inherently a safer material choice.
⚠Risky category by default
Pyrex
Ceramic Fry Pan 10-in
ceramic non-stick coating
Ceramic coating degradation and flaking
Ceramic non-stick coatings are inherently less durable than Teflon-type coating and shed…
Aluminum base leaching
If this pan uses aluminum rather than stainless steel (common but unconfirmed for this…
Coating adhesion and peel risk over time
Ceramic non-stick coatings bond less durably to underlying metal than Teflon-type coating…
Ceramic coating means lower PFAS risk than standard non-stick.
⚠Risky category by default
Pyrex
Ceramic Cookware Set
Ceramic non-stick coating
Ceramic coating degradation and base material exposure
Ceramic coatings can chip or flake with age or improper use, potentially exposing the…
Aluminum leaching from base material
If cookware base is aluminum and coating degrades, exposure to acidic or alkaline foods…
Thermal stress and coating failure
User reports exist online of ceramic non-stick coatings cracking or peeling after thermal…
Ceramic cookware avoids Teflon-type coating and other Teflon-family coating coatings.
⚠Risky category by default
Pyrex
Rockler Silicone Project Mat
silicone
Bacterial or mold growth if unmaintained
Silicone surfaces are nonporous and resist microbial colonization better than cloth or…
Migration of manufacturing residue or plasticizers
Some silicone products retain manufacturing oils or uncrosslinked oligomers that may…
Silicone project mat carries low concern; no coating risk.
⚠Risky category by default
Pyrex
Freshlock 10-Piece Glass Storage Set
Borosilicate glass containers with plastic lids (PP/TPE closure material unspecified)
Microplastics
Polypropylene and TPE lids can degrade over repeated heating cycles or extended UV…
Additive migration from plastic lids
PP and TPE lid formulations may contain plasticizers, stabilizers, or release agents not…
Glass breakage and physical injury
Borosilicate glass is durable but not unbreakable; drops, thermal shock from rapid…
Bacterial growth in degraded or poorly sealed lids
If lids warp or seals fail, food storage integrity is compromised, allowing bacterial…
Lower PFAS concern; glass containers are inherently low-risk; check lid material if possible.
⚠Risky category by default
Pyrex
6-Piece Food Storage Container Set
borosilicate glass with plastic lids
Plastic lid degradation and replacement necessity
Polypropylene lids in this set will soften, discolor, or lose seal integrity after…
Microplastic shedding from lids under heat stress
If plastic lids are exposed to prolonged high temperatures (oven heating, dishwasher hot…
Undisclosed chemicals in lid coatings or gasket materials
Pyrex does not publicly state whether silicone gaskets or polypropylene lids contain…
Borosilicate glass breakage and cut hazard
While borosilicate glass is more durable than standard soda-lime glass, it is still glass…
Lower PFAS concern; borosilicate glass containers pose minimal risk; plastic lids warrant standard caution.
⚠Risky category by default
Pyrex
18-Piece Clear Glass Food Storage Container Set
borosilicate glass with plastic lids
PFAS
Polypropylene lids can leach trace compounds when exposed to heat or acidic foods over…
Seal degradation and bacterial growth
Plastic gaskets and lids can degrade or accumulate food residue in crevices if not…
Glass breakage hazard
Borosilicate glass is impact-resistant but not shatterproof. Some users have reported…
Lid staining and odor retention
Plastic lids commonly stain and retain odors from foods like tomato sauce or turmeric…
Lower PFAS concern; glass containers are inherently safe; plastic lids carry modest risk but no confirmed data.
⚠Risky category by default
Pyrex
Simply Store 6-Piece 2-Cup Glass Storage Container Set with Lids
borosilicate glass container, plastic lids (likely polypropylene or polyethylene)
Plastic lid degradation and microplastic release
Polypropylene and polyethylene lids can soften, warp, or crack with repeated high-heat…
Borosilicate glass thermal shock fracture
Borosilicate is highly thermal-shock resistant but can crack if moved directly from…
Lower PFAS concern; glass containers are a solid choice; monitor plastic lid sourcing if you want extra assurance.
⚠Risky category by default
Pyrex
Simply Store 10-Piece Glass Storage Container Set
borosilicate glass containers with plastic lids
BPA & bisphenols
Pyrex does not disclose whether PP lids contain BPA, phthalates, or other additives. PP…
Lid degradation and seal failure
Consumer reports indicate that Pyrex PP lids become cloudy, warp, or lose seal integrity…
Microplastic shedding from lids
Worn or scratched PP lids may shed micro-particles over time, especially if repeatedly…
Lower PFAS concern; glass itself is inherently PFAS-resistant, though plastic lids warrant caution.
⚠Risky category by default
Graded and flagged Poor and Bad, we’d swap these
Pyrex
Ceramic Deep Fry Pan with Lid
Ceramic (non-stick coating not Teflon-type coating-based)
Ceramic coating degradation over time
Ceramic non-stick coatings can wear, chip, or scratch with use, particularly if metal…
Lid seal or handle failure
Lids and handles on deep fry pans with lids can degrade with repeated heating and…
Ceramic cookware keeps PFAS concern to a lower level.
⚠Risky category by default
Pyrex
Optima+ Non-stick Frying Pan
Non-stick coating (type unspecified)
Teflon-type coating thermal degradation and fume inhalation risk
If this pan uses Teflon-type coating-based non-stick, overheating above…
Non-stick coating degradation and microparticle shedding
All synthetic non-stick coatings wear over time; scratching or peeling exposes underlying…
Aluminum leaching from substrate
Non-stick pans typically use aluminum for heat distribution; if the coating becomes…
Coating adhesion and long-term durability stability
Pyrex provides no published data on how long the Optima+ coating remains safe and…
Pyrex hides its non-stick coating chemistry and PFAS stance.
⚠Nonstick, coating undisclosed
Pyrex
Tupperware Wonder Mat
Silicone baking mat, unspecified nonstick coating
Nonstick coating degradation and leaching
The undisclosed nonstick formulation may leach into food if the coating chips, cracks, or…
Heat-induced coating failure and flaking
Silicone baking mats in general are known to degrade at temperatures above 400-450°F…
Unverified nonstick formulation safety
Without disclosure of the coating's chemistry or third-party certification (FDA approval…
Nonstick coating not disclosed; no public PFAS safety data.
⚠Nonstick, coating undisclosed
Every grade uses the same public rubric. How grades work →