Pyrex No-Leak Glass · Food Storage Containers
Pyrex Freshlock 10-Piece Glass Storage Set
Lower PFAS concern, glass container with no reported Teflon-family coating coatings.
Pyrex Freshlock is primarily borosilicate glass, a non-fluorinated material with inherently lower PFAS risk. The main concern is the plastic lids; PP/PE plastics are not formulated with PFAS, though no explicit brand disclosure exists. No government recalls or detected PFAS in published testing linked to this product line.
Shop Pyrex No-Leak Glass on Amazon →Material
borosilicate glass with plastic lids (likely polypropylene or polyethylene)
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
Pyrex Freshlock uses borosilicate glass as the primary container material, which is chemically inert and does not leach into food under normal use. The lids are likely polypropylene (PP) or polyethylene (PE) plastic, both lower-hazard plastics when not heated. Borosilicate glass has a higher melting point than standard soda-lime glass, making it more durable and resistant to thermal shock from temperature changes.
The brand's record and disclosure
Pyrex (owned by Instant Brands) does not publicly disclose PFAS testing or avoidance commitments, but the brand has a long established history in food storage without major chemical safety recalls in the United States. No specific safety certifications (BPA-free claims, third-party testing) are prominently marketed for this line. The brand's transparency on material sourcing and chemical screening is minimal compared to newer competitors.
How it compares in its category
Glass food storage containers are among the safest options in the category because glass does not interact chemically with food. Pyrex Freshlock is mid-range in cost and durability; comparable alternatives include OXO, Rubbermaid Brilliance, and store brands, most of which use similar borosilicate glass with plastic lids. Pyrex's main differentiation is brand heritage and wide retail availability rather than superior safety features.
If you buy it
Use the glass containers for all foods and temperatures; avoid using plastic lids in the microwave or oven to prevent low-level plastic degradation. Replace lids if they become cloudy, cracked, or lose seal integrity, as degraded plastic can degrade faster over time. Hand-wash lids to extend life; glass itself is dishwasher-safe and will not degrade. Store away from impact zones to prevent breakage, which is the primary failure mode.
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, phthalates, or other plasticizers)
Pyrex does not specify plastic resin type or disclose BPA-free status for Freshlock lids. Polypropylene and polyethylene are lower-risk plastics, but without independent verification or company claims, low-level leaching during prolonged storage or mild heating cannot be ruled out.
Plastic lid degradation over time
User reports and material science literature document that plastic lids become brittle, discolored, and lose seal integrity after repeated dishwashing and temperature cycling. As lids degrade, plastic particles or residues may contaminate food, and sealing function is lost.
Glass breakage and sharp edges
Borosilicate glass is durable but not unbreakable. Thermal shock from rapid temperature change or accidental impact can cause breakage; broken glass edges pose laceration and ingestion risk, particularly in households with children.
Microplastics from lid wear
As plastic lids wear, microscopic fragments may shed into stored food, especially if lids are repeatedly scraped or heated. No specific testing on this product line is publicly available.
Insufficient product disclosure on material composition
Pyrex does not publicly specify the exact plastic resin, additives, or certifications for the Freshlock lids, limiting consumer ability to assess or compare chemical risk.
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
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.