Pyrex No-Leak Glass · Food Storage Containers
Pyrex Freshlock 8 Cup Rectangle Food Storage Container
Lower-concern choice, glass is PFAS-inert, but lid composition opaque.
Pyrex Freshlock uses borosilicate glass for the main container, a material that does not contain or leach PFAS. The primary uncertainty is the plastic lid's material composition and any coatings applied for water-resistance or grease-resistance, which Pyrex does not publicly disclose.
Shop Pyrex No-Leak Glass on Amazon →Material
borosilicate glass container with plastic lid (polymer composition unspecified)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
food packaging is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
The Pyrex Freshlock container uses borosilicate glass, a thermal-shock-resistant glass formulation that does not leach lead, cadmium, or other heavy metals into food under normal use. The lid is polymer-based (specific resin type not disclosed by manufacturer), which is where chemical migration risk concentrates. Borosilicate glass is inert across pH ranges and temperature swings typical of refrigerator and microwave use, making the glass component one of the safest food-contact materials available.
The brand's record and disclosure
Pyrex (owned by Instant Brands) does not publicly disclose detailed polymer composition of its lids or submit to third-party PFAS testing for this product line. The brand has not issued recalls specifically tied to chemical leaching from Freshlock containers. Pyrex maintains general food-safety claims but is silent on flame retardants, phthalates, or BPA status in plastic lids, which limits independent verification of lid safety beyond absence of documented harm.
How it compares in its category
Glass containers with plastic lids dominate the premium food-storage segment and are generally safer than polycarbonate or polypropylene alternatives from a leaching perspective. Freshlock competes directly with Rubbermaid Brilliance and OXO Good Grips; all three use glass bodies and undisclosed plastic lids. Pyrex's borosilicate formulation is equivalent to Rubbermaid and OXO in thermal durability, though no brand in this category fully discloses lid composition or undergoes public PFAS screening.
If you buy it
Keep the container below 400F and avoid direct flame or broiler use to prevent thermal stress on the glass-to-lid seal. Wash lids by hand rather than dishwasher to reduce plastic degradation over time; replace the lid every 2-3 years or if visible wear, cloudiness, or odor appears. Do not microwave food directly in contact with the lid; transfer to a dish if heating. Store in a cool, dark place to slow plastic aging.
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.”
Plastic lid composition and phthalate/BPA risk
Pyrex does not disclose the specific polymer type (polypropylene, copolyester, or other) or certify absence of BPA or phthalates in the lid. No recalls or published testing address this product's lid specifically, so risk cannot be ruled out but is not documented.
Lid degradation and microplastic shedding
Plastic lids degrade with repeated heating, washing, and UV exposure; fragments or leachates may enter food over years of use. Pyrex does not specify polymer durability or replacement intervals, leaving users to judge wear visually.
Borosilicate glass thermal stress and breakage
Borosilicate glass is engineered for thermal shock resistance, and no specific breakage or contamination incidents are on record for this model. However, impacts or extreme temperature swings can cause fracture; broken glass poses sharp-injury and aspiration risk.
Seal integrity and bacterial growth in lid gasket
The 'no-leak' claim depends on gasket integrity; if gasket deteriorates or is improperly seated, bacteria can colonize the seal cavity. Pyrex does not provide gasket replacement parts or guidance on sanitizing the seal.
Heavy metals in glass formulation
Borosilicate glass is not known to leach lead, cadmium, or arsenic under normal food-contact conditions. No recalls or test failures are on record for Pyrex containers in this regard.
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.
Safer alternatives in Food Storage Containers
Caraway
Food Storage Set
Glass containers with plastic lids
Lower concern; glass + plastic lids with stated PFAS-free position, but no third-party verification of lid material.
⚠Risky category by default
Caraway
Home 9-Piece Mini Food Storage Set
Borosilicate glass containers with plastic lids
Lower-concern option; glass containers avoid PFAS coatings, but verify lid material before purchase.
⚠Risky category by default
Caraway
Cream 6.6-Cup Non-Stick Glass Food Storage Container with Lid
borosilicate glass with non-PFAS lid
Lower PFAS concern, glass container with stated non-PFAS lid, though third-party verification absent.
⚠Risky category by default
More food storage containers 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.