Pyrex No-Leak Glass · Food Storage Containers
Pyrex Glass Meal Prep Set
Lower-concern choice, glass meal prep poses minimal PFAS risk.
Pyrex glass meal-prep containers are made from borosilicate glass, a non-fluorinated material with no inherent PFAS content. The silicone gasket seals on lids could theoretically contain PFAS, though this is uncommon in food-contact gaskets.
Shop Pyrex No-Leak Glass on Amazon →Material
Borosilicate glass with silicone seals
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.
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
Pyrex No-Leak uses borosilicate glass, a chemically inert material that does not leach into food under normal use conditions. The seals are silicone, which is also food-grade and stable across typical kitchen temperatures. Borosilicate glass differs from soda-lime glass by its higher silica and boron content, making it more resistant to thermal shock and chemical breakdown. This material class has no known endocrine-disrupting or toxic leaching pathway to food.
The brand's record and disclosure
Pyrex (owned by Instant Brands since 2017) does not publish detailed PFAS or chemical safety statements on its food-storage product lines. The brand has not faced public recalls or safety actions related to leaching from glass meal-prep containers. Historical context: Pyrex glassware reputation is built on durability and material stability, though the company has been quieter on proactive chemical disclosure compared to some competitors.
How it compares in its category
Glass meal-prep containers are among the lowest-risk options in food storage, alongside stainless steel. Silicone seals are more stable than BPA-prone plastic lids and do not off-gas volatile organics in the way some polypropylene or polycarbonate alternatives do. Pyrex's borosilicate formulation is standard for premium glass food storage and performs comparably to OXO, Rubbermaid Brilliance, and other established brands in the category.
If you buy it
Avoid heating sealed containers in the microwave without venting, as silicone seals can trap steam and degrade. Inspect seals every 6-12 months for discoloration, hardening, or loss of elasticity; replace if degraded. Do not expose to direct flame or broiler. Hand-wash seals separately to prevent mold growth in crevices, or remove seals before dishwasher cycles. Borosilicate glass itself will not degrade, but silicone longevity typically spans 2-3 years with regular use.
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.”
Silicone seal degradation and mold growth
Silicone seals can accumulate mold or bacterial biofilm if not cleaned thoroughly, particularly in crevices. Risk is maintenance-dependent, not inherent to the material itself.
Thermal shock and glass fracture
Borosilicate glass is thermal-shock resistant but not immune. Rapid temperature changes (hot to cold or vice versa) can cause cracking; no safety data shows this is a sharper risk than standard glass, but user error can occur.
BPA or phthalates from lid/seal polymers
No publicly disclosed BPA or phthalate content in Pyrex silicone seals. Silicone itself does not contain phthalates or BPA as binding agents, though no independent testing of this specific product is on public record.
Leaching from borosilicate glass
Borosilicate glass is chemically inert and does not leach lead, cadmium, or other heavy metals into food under normal storage conditions. No recalls or reports link Pyrex glass meal-prep containers to leaching.
Microplastics from seal wear
Repeated flexing and compression of silicone seals over years could theoretically generate microparticles. No quantified data exists on Pyrex seals specifically, but risk is lower than single-use plastic alternatives.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 92% 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.