Pyrex Cook & Freeze Rectangular Dish with Lid 800ml
Lower concern. Glass container with plastic lid, no known PFAS risk.
Pyrex Cook & Freeze uses borosilicate glass for the dish and polypropylene for the lid. Glass is not associated with PFAS; polypropylene lids are not typically treated with PFAS unless specified.
We flunk more products than we pass. This one earned its grade. How we grade
Material
borosilicate glass, polypropylene lid
Lab data
No public lab test
What Pyrex Cook & Freeze Rectangular Dish is made of, ingredients and materials
The container is borosilicate glass, a thermal-shock-resistant soda-lime glass formulation that does not leach metals or chemicals into food under normal use. The lid is polypropylene (PP #5), a plastic with lower leaching risk than polycarbonate or polyvinyl chloride at refrigerator and freezer temperatures. Borosilicate glass has no coating; the material itself is the barrier between food and container.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Glass breakage and sharp edges
Borosilicate glass is impact-resistant but not shatterproof. If broken, sharp fragments and potential micro-glass particles in food are the hazard. This is a mechanical, not chemical, risk and is managed by careful handling and inspection.
Bacterial growth in lid seals
Polypropylene lids with silicone or plastic seals can trap moisture and bacteria if not dried thoroughly after washing. This is a hygiene issue, not a material hazard, and is prevented by hand-washing and air-drying after use.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
BPA & bisphenols
Polypropylene (#5) is not formulated with BPA or phthalates by design. No leaching has been reported for Pyrex lids under normal refrigerator and freezer use. Risk increases only if lid contacts hot food above 70°C or is exposed to solvents.
Source, FDA ↗Microplastics
Polypropylene lids do not shed microplastics under normal use at cold temperatures. Risk would only arise if the lid were heated above its melting point (160°C) or mechanically degraded over years of use and aggressive washing.
Source, EPA ↗Metal leaching from borosilicate glass
Borosilicate glass does not contain lead, cadmium, or other heavy metals in its composition. The boron and silica matrix is chemically inert under normal food-storage conditions.
The full breakdown
The brand's record and disclosure
Pyrex is owned by Groupe SEB and has a long-established reputation for laboratory-grade glassware. The brand does not publicly disclose detailed material or chemical testing for consumer cookware lines. No safety recalls or chemical-contamination reports are on record for Pyrex glass food-storage products. The brand has not made statements about BPA, phthalates, or other leaching hazards, likely because borosilicate glass and polypropylene are not known sources of these compounds.
How it compares in its category
Glass storage containers are generally lower concern than plastic-only alternatives, which may contain BPA or phthalates depending on resin type and age. Borosilicate glass is more durable and temperature-stable than soda-lime glass or ceramic, reducing risk of coating degradation or crazing that could release particles. Polypropylene lids are common across the category and are acceptable for cold and ambient storage; silicone or glass lids are alternatives if plastic contact is avoided.
If you buy it
Do not use in a conventional oven above 400°F; borosilicate glass is oven-safe but the polypropylene lid will warp or melt if exposed to direct heat. Hand wash the lid and inspect annually for cracks, warping, or permanent staining; replace if damaged. Store in a cool, dry place; polypropylene can degrade if left in direct sunlight for extended periods. Avoid sudden temperature changes (e.g., freezer to hot oven) to prevent thermal shock.
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 a specific claim
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Lunch Boxes
Klean Kanteen
Double Wall Vacuum Insulated Stainless Steel Food Canister Container with Leak Proof Lid
- Stainless steel body, silicone gasket lid seal
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation
3 hazards checked on this product. See all of them.
More lunch boxes 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.