Glasslock · Food Storage Containers
Glasslock Oven Safe Rectangle 6pc set
Lower-concern buy; glass food containers don't require PFAS-based coatings.
Glasslock's oven-safe glass containers are made from borosilicate glass, which is an inherently inert material with no known PFAS application. Glass does not require non-stick, waterproofing, or grease-resistant treatments to function, so PFAS exposure from this product is unlikely.
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borosilicate glass with stainless steel lids
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
Glasslock containers use borosilicate glass, a type specifically engineered to resist thermal stress and chemical leaching. The lids are stainless steel, which does not leach metals or chemicals into food under normal use. Unlike ceramic or plastic food storage, borosilicate glass has no polymeric coating that can degrade, no glaze that may contain lead, and no risk of microplastic shedding when heated or microwaved. This material combination is chemically stable across a wide temperature range.
The brand's record and disclosure
Glasslock does not publicly disclose PFAS testing results or a dedicated PFAS-free stance, placing them in the silent majority on this issue. However, no product recalls or safety violations are on record for this borosilicate line. The brand markets the containers as oven-safe and BPA-free, acknowledging basic consumer safety expectations. Independent laboratory testing of similar borosilicate glass products has found no PFAS or heavy metal contamination, though Glasslock has not independently verified this.
How it compares in its category
Glass food storage containers avoid the primary hazards of plastic alternatives (BPA, phthalates, leaching). Compared to ceramic or metal containers, borosilicate glass is chemically more transparent and carries no glaze contamination risk. The stainless steel lid is preferable to plastic or silicone lids, which can degrade over time and shed particles. In its category, this product design is among the safest options available.
If you buy it
Borosilicate glass is microwave, oven, and dishwasher safe up to the manufacturer's stated temperature (typically 400F for this line). Replace lids if silicone seals crack or become discolored, as degraded seals reduce airtightness. Do not subject glass to sudden extreme temperature changes (e.g., moving from freezer to hot oven), as thermal shock can cause breakage. Hand wash lids occasionally to extend seal life and prevent mineral buildup around threads.
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.”
Thermal breakage risk
While borosilicate glass is more resistant to thermal shock than soda-lime glass, sudden temperature extremes (freezer to direct heat) can still cause cracking or shattering. Follow manufacturer guidance on temperature transitions.
Stainless steel lid degradation
Silicone gasket seals may degrade over years of repeated dishwasher cycles or exposure to acidic foods. Degraded seals compromise airtightness but do not leach toxic substances; lids can be replaced individually.
BPA or phthalates in lid gasket
Glasslock markets these containers as BPA-free; no reports of BPA, BPS, or phthalate contamination in the silicone or stainless steel lids. Material composition of gaskets is not disclosed in detail.
Lead or cadmium in glass
Borosilicate glass used in food storage containers does not require lead-based flux or cadmium colorants. No recalls or contamination reports exist for this product line.
Microplastic or coating shedding
Borosilicate glass has no polymeric coating to degrade. Stainless steel lids do not shed microplastics. This design eliminates a major hazard of plastic storage alternatives.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 85% 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.