Pyrex Totalseal · Food Storage Containers
Pyrex Freshlock 5-Pack 4-Cup Glass Food Storage Containers
Lower PFAS concern, glass containers are inherently PFAS-free, though plastic lids warrant monitoring.
Pyrex Freshlock uses borosilicate glass for the containers themselves, which carries no PFAS risk. The plastic lids are the potential concern; Pyrex does not publicly disclose lid material or PFAS status.
Shop Pyrex Totalseal on Amazon →Material
borosilicate glass with plastic lids (Tritan or unspecified copolyester)
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
The containers themselves are borosilicate glass, a chemically inert material that does not leach into food under normal use. The lids are made from plastic, Pyrex has used both Tritan copolyester (BPA-free by design) and unspecified copolyester in different production runs of this line. Borosilicate glass is thermal shock-resistant and safe for oven and microwave use up to the manufacturer's stated temperature limits. The plastic-to-glass seal is the only pathway for potential chemical migration into food.
The brand's record and disclosure
Pyrex (owned by Instant Brands) does not publicly disclose detailed chemical composition of its plastic lids or provide third-party certification for BPA/BPS absence on this specific model line. The brand has no known recent recalls for this product related to leaching or chemical safety. Pyrex maintains general marketing around 'glass safety' but does not actively communicate about PFAS in lid seals or provide transparency on plastic sourcing and testing protocols.
How it compares in its category
Glass food storage containers are inherently safer than plastic-only alternatives because the primary storage surface cannot leach. Pyrex sits in the mainstream category: mid-priced, widely available, and relying on sealed lids rather than lid-free designs. Compared to brands like Rubbermaid Brilliance (plastic) or OXO Good Grips (glass with stainless steel lids), Pyrex offers glass durability but with less transparency on lid chemistry. Most competitors in this price tier also use undisclosed or semi-disclosed plastic lid materials.
If you buy it
Do not use the containers in direct microwave contact with the plastic lids (remove lids before heating or use oven-safe covers). Hand-wash plastic lids instead of dishwasher to extend seal integrity and reduce thermal stress on the plastic. Replace lids every 1-2 years if they show discoloration, warping, or reduced seal effectiveness, as degraded plastic increases leaching risk. Avoid storing hot foods directly in the container while lids are sealed; cool foods first to reduce plastic exposure to heat.
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 leaching (BPA/BPS/phthalates)
Pyrex does not confirm whether lids are Tritan or generic copolyester across all production batches. If generic copolyester is used, risk of BPA/BPS presence is low but not ruled out. No published testing data available for this specific lid formulation.
Microplastics from lid degradation
As plastic lids age and are repeatedly heated and cooled, micro-scale material loss is possible. This is a general concern for all plastic-sealed glass containers, not unique to Pyrex, but risk increases with dishwasher use and thermal cycling.
Seal failure and cross-contamination
If the plastic-to-glass seal degrades, food contact with the rim and lid interior increases, creating a pathway for potential leaching. Pyrex provides limited guidance on recognizing seal failure.
Glass chips or slivers
Borosilicate glass is durable and chip-resistant, but impact breakage remains a physical hazard not specific to this brand. No elevated risk compared to other glass storage containers.
Thermal shock cracking
Borosilicate glass is designed to withstand thermal stress. Pyrex's product specifications allow oven use to defined limits. Risk occurs only if used outside manufacturer guidance (e.g., direct flame or extreme temperature changes).
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.