Glasslock · Food Storage Containers
Glasslock Rec't 10.5 cup
Lower concern, glass container; monitor plastic lid components but no known PFAS exposure route.
Glasslock's primary 10.5-cup container is borosilicate glass, a well-established food-safe material with no PFAS concern. The lid and seals are plastic (likely PP/silicone), which carry minimal PFAS risk for dry food storage.
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Borosilicate glass with plastic lid (PP/silicone seal)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
No PFAS disclosure
No public statement about PFAS in this product.
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
This container uses borosilicate glass as the primary storage vessel, which is chemically inert and does not leach into food under normal conditions. The lid assembly combines polypropylene (PP) plastic with a silicone seal. Borosilicate glass is specifically formulated to resist thermal shock and chemical attack, making it one of the safest food-contact glass types available. The PP plastic lid and silicone gasket are secondary components that contact food only at the rim and seal interface, minimizing exposure surface.
The brand's record and disclosure
Glasslock has established a reputation in the glass food storage category without publicized safety incidents or major recalls related to chemical leaching. The brand does not prominently disclose material sourcing, manufacturing certifications, or third-party testing results on consumer-facing channels. No formal statements on BPA, phthalates, or heavy metal compliance are readily available, though PP and silicone are not typical sources of these contaminants. The brand's silence on material provenance is typical for mid-market food storage manufacturers but reflects limited transparency compared to premium competitors.
How it compares in its category
Borosilicate glass containers are among the safest options for food storage and rank higher than plastic-primary alternatives (polycarbonate, acrylic) in terms of chemical leaching risk. This product is comparable to Pyrex and OXO glass containers in material choice but lacks their explicit third-party certifications or detailed material disclosures. The plastic lid is a slight point of concern relative to all-glass or stainless-steel-lid alternatives, though PP and silicone are lower-risk plastics than polycarbonate or polystyrene. Price-to-safety positioning suggests strong value in the category.
If you buy it
Do not expose the container or lid to prolonged heat above 100 degrees Celsius (212F), as PP softens and silicone may degrade; hand wash or use low heat dishwasher cycles. Inspect the silicone seal annually for visible cracks, discoloration, or odor; replace if degraded to maintain lid integrity and prevent mold growth in the seal channel. Avoid storing acidic foods (citrus, vinegar) for months at a time, as prolonged contact with silicone can cause minor odor transfer. The glass vessel itself is durable and does not require replacement unless visibly cracked.
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 degradation (PP) and silicone seal breakdown
Polypropylene lids can warp or soften if exposed to heat, and silicone seals may degrade, lose elasticity, or absorb odors over 2-3 years of use. No chemical leaching is expected at normal food storage temperatures, but seal failure can lead to loss of airtightness and mold growth in the seal channel.
BPA, phthalates, or other plastic additives in lid/seal
PP and food-grade silicone are not typical sources of BPA or phthalates, and Glasslock's lid components are manufactured to assume food-contact safety standards. No specific test results or recalls for Glasslock lids on these chemicals are on record; however, material certification details are not publicly disclosed.
Borosilicate glass thermal shock and breakage
Although borosilicate is designed to resist thermal stress, rapid temperature changes (e.g., hot oven to cold counter) can still cause cracking or shattering. This is a mechanical rather than chemical hazard but relevant to safe use.
Microplastic release from lid wear or heating
PP lids are not known to shed microplastics at food storage temperatures or under normal use. If the lid is heated significantly or degraded, minor particle release is theoretically possible but not established as a documented concern for this product.
Heavy metals or contaminants in glass formulation
Borosilicate glass produced to food safety standards does not intentionally contain lead, cadmium, or other heavy metals. No recalls or test failures for Glasslock products on heavy metal leaching are on record.
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.
Safer alternatives in Food Storage Containers
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⚠Risky category by default
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Cream 6.6-Cup Non-Stick Glass Food Storage Container with Lid
borosilicate glass with non-PFAS lid
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⚠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.