Pyrex Totalseal · Food Storage Containers
Pyrex FreshLock 16-Piece Glass Storage Set
Lower PFAS concern, glass containers themselves are inert; focus scrutiny on lid seals and gaskets.
Pyrex FreshLock is primarily borosilicate glass, which does not leach PFAS. The plastic lids and gasket seals are the potential exposure point; Pyrex makes no public disclosure about PFAS in these components.
Shop Pyrex Totalseal on Amazon →Material
borosilicate glass with polypropylene/plastic 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
This set pairs borosilicate glass containers with polypropylene (PP) snap-lock lids and gasket seals. Borosilicate glass is one of the safest food-contact materials available, resistant to thermal shock and non-leaching across normal use temperatures. The plastic lids are the chemical exposure point: polypropylene itself is stable, but the manufacturing process and additives (plasticizers, colorants) warrant scrutiny. Gasket materials are typically silicone or rubber, which can degrade with repeated heating and cooling.
The brand's record and disclosure
Pyrex (now owned by Instant Brands following acquisition from World Kitchen) has maintained a strong reputation for glass cookware and storage safety for over a century. The brand does not publicly trumpet BPA-free status or provide detailed material disclosures for lids and gaskets on this specific product line, which is typical for the category. No major recalls or contamination incidents involving Pyrex FreshLock containers are on public record. Independent testing by Consumer Reports and similar bodies has generally rated Pyrex favorably for structural integrity and durability.
How it compares in its category
This product sits in the mainstream of glass food storage; direct competitors like Rubbermaid Brilliance, OXO Glass, and Anchor Hocking use similar borosilicate glass with polypropylene or silicone lids. Pyrex's glass thickness and lid seal design are consistently rated as robust. Higher-end alternatives (Glasslock, Sistema) may offer more premium gasket materials, while budget options sometimes use thinner glass or lower-grade lid polymers. The 16-piece format is larger than average, which may increase the likelihood of lid wear over time across multiple containers.
If you buy it
Avoid prolonged microwave heating of lids; remove them before reheating food. Hand-wash lids rather than running them through the dishwasher, as this extends gasket life and reduces heat exposure to plastics. Replace lids every 2-3 years or when seals no longer snap securely, as degraded gaskets can harbor bacteria and lose moisture-blocking function. Store containers away from direct sunlight to slow plastic aging. Do not use lids in the oven; glass containers themselves are oven-safe to 350°F.
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.”
BPA/Phthalates in polypropylene lids
Polypropylene is generally BPA-free by design, but some formulations may contain phthalate plasticizers or other additives. Pyrex does not publicly certify this product as phthalate-free. Risk is minimal under normal cold/room-temperature storage but increases if lids contact hot or fatty foods.
Gasket/seal degradation and bacterial growth
Silicone or rubber gaskets can degrade, crack, or discolor with repeated heating and dishwashing. Degraded seals compromise the airtight seal, allowing moisture and potential bacterial colonization. This is a mechanical rather than chemical hazard but is a known failure mode for storage containers of this type.
Borosilicate glass thermal stress fracture
Borosilicate glass is engineered to resist thermal shock, and Pyrex has a strong track record with this material. Fractures typically occur only from direct impact, not from normal thermal cycling. No specific safety issues are documented for this product line.
Microplastics from lid wear
Over years of use, polypropylene lids may shed microscopic plastic particles, especially if scratched or exposed to high heat or UV light. This is a long-term concern with all plastic-lidded food storage but is difficult to quantify without accelerated degradation testing specific to this product.
Heavy metals in lid pigments or dyes
Pyrex FreshLock lids are typically clear or neutral colors. No recalls or testing data suggest heavy metal contamination in lid dyes or colorants. This hazard is more relevant to brightly colored or patterned lids from unknown manufacturers.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 92% 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.