Glasslock · Food Storage Containers
MHRB-250 Glasslock Handy Rectangle 10.5 cups
Lower PFAS concern, glass container, but no brand disclosure on lid materials.
Glasslock's MHRB-250 is a borosilicate glass food storage container with a removable lid. The glass itself poses minimal PFAS risk, but the lid material composition (likely plastic or silicone) is undisclosed by the brand. No third-party PFAS testing or certifications are publicly available for this model.
Shop Glasslock on Amazon →Material
borosilicate glass with plastic/silicone lid
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
Category baseline
food packaging is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
This container is borosilicate glass, which is chemically inert and does not leach metals, BPA, or other compounds into food under normal use. The lid is silicone or plastic (exact polymer not publicly specified by Glasslock). Borosilicate glass is resistant to thermal shock and safe for oven and microwave use up to manufacturer limits, making it one of the safest food storage materials available.
The brand's record and disclosure
Glasslock is a South Korean brand with a strong presence in borosilicate glass containers. The company does not publicly disclose the exact polymer or manufacturing details of its lids, which limits transparency on potential chemical additives. No major safety recalls or contamination incidents have been documented for this product line. The brand's silence on PFAS or BPA status suggests minimal proactive testing communication, but no red flags are on record.
How it compares in its category
Borosilicate glass food storage containers are among the safest options available; Glasslock is a mid-market brand competing alongside Pyrex, OXO, and Rubbermaid. Unlike plastic-only containers, glass eliminates leaching risk from the primary storage vessel. The main variable across brands is lid design and material; Glasslock's silicone/plastic lids are standard in this price range but less transparent in composition than some competitors who specify BPA-free certification.
If you buy it
Hand-wash lids rather than using the dishwasher to extend silicone/plastic life and avoid heat-accelerated degradation. Do not heat the lids in the microwave or oven; only the glass vessel is suitable for these appliances. Replace lids if they become discolored, brittle, or develop odor, as these are signs of polymer breakdown. Store away from direct sunlight to minimize plastic degradation over time.
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.”
Lid polymer composition (BPA, phthalates, other plasticizers)
Glasslock does not publicly disclose the exact plastic or silicone polymer used in lids or whether BPA/phthalates are present. Standard food-grade silicone and polypropylene are typically BPA-free, but without third-party certification or brand transparency, the risk level remains unconfirmed.
Lid degradation and microplastic release
Over years of use, silicone or plastic lids can degrade, crack, or shed particles, especially if exposed to heat or dishwasher cycles. No published data on Glasslock lids specifically, but this is a known hazard in the category with long-term storage.
Glass thermal shock or breakage
Borosilicate glass is more resistant than soda-lime glass, but rapid temperature changes (e.g., hot oven to cold counter) can still cause breakage or stress fractures, creating sharp edges and contamination risk.
Lid odor and off-gassing
No documented odor or VOC off-gassing complaints specific to Glasslock lids are on record. Some users report slight plastic smell when new, which typically dissipates after a few washes.
Lead or cadmium in glass
Borosilicate glass used in food storage is not formulated with lead or cadmium glazes. Glasslock's manufacturing is not known to deviate from standard borosilicate safety practices.
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.