Pyrex · Muffin Tins
Pyrex Muffin Tray
Lower PFAS concern, borosilicate glass baking tray poses minimal chemical risk.
Pyrex muffin trays are made from borosilicate glass, a well-established inert material with no known PFAS content or Teflon-family coating coatings. Glass cookware does not require chemical release agents or nonstick treatments, eliminating a primary PFAS exposure pathway common in coated metal pans.
Shop Pyrex on Amazon →Material
borosilicate glass
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
cookware is a category where PFAS exposure is more common.
The full breakdown
What it's made of and why it matters
Pyrex muffin trays are manufactured from borosilicate glass, a silica-based material engineered to withstand thermal shock and resist chemical leaching. Unlike ceramic or enameled cookware, borosilicate glass has no glazes, coatings, or binders that can degrade, chip, or release contaminants into food. The material is inert across normal cooking temperatures and is not known to leach lead, cadmium, aluminum, or other heavy metals.
The brand's record and disclosure
Pyrex has maintained a long market history as a borosilicate glassware brand with no published safety recalls specific to leaching or chemical contamination of muffin trays. The brand does not publicly disclose PFAS testing or make explicit PFAS-free claims. Pyrex is owned by Instant Brands and has faced no recent major safety controversies tied to this product category.
How it compares in its category
Borosilicate glass muffin trays are among the safest options in the category; they avoid the coating-degradation risks of nonstick aluminum trays and the glaze-leaching concerns of ceramic muffin pans. Compared to steel or aluminum trays (which can corrode or leach aluminum under acidic conditions), glass offers superior chemical inertness. The trade-off is weight and breakage risk, which glass shares with all ceramic cookware.
If you buy it
Pyrex glass is rated for temperatures up to approximately 425-450°F in most applications; verify your specific model's max temperature on the box or Pyrex website. Hand-wash or use a gentle dishwasher cycle to avoid thermal shock from rapid temperature changes, which can crack glass. Inspect regularly for chips or cracks and discontinue use if damage occurs. The product does not require seasoning or special maintenance beyond normal cleaning.
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 shock and breakage
Glass muffin trays can crack or shatter if exposed to rapid temperature changes (e.g., moving from oven to cold countertop). This is a mechanical hazard, not a chemical one, but creates fragments in food.
Lead or cadmium in glass
Borosilicate glass formulations used in modern Pyrex do not intentionally incorporate lead or cadmium. No recalls or test reports of heavy metal leaching from Pyrex borosilicate muffin trays are on record.
Coating degradation or flaking
Pyrex muffin trays are uncoated glass; there is no enamel, nonstick layer, or ceramic glaze to chip, peel, or degrade over time.
Aluminum or metal leaching
Borosilicate glass does not contain aluminum or reactive metals. No leaching mechanism is known for this material class under normal baking conditions.
Microplastics or polymer degradation
Glass muffin trays contain no plastics or polymers in the baking surface. This hazard is irrelevant to glass cookware.
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 Muffin Tins
Caraway
Nonstick Ceramic Muffin Pan
ceramic nonstick coating
Lower concern, ceramic coating and MADE SAFE certification support PFAS-free claim, though no independent lab testing published.
⚠Risky category by default
Caraway
West Elm Caraway Non-Stick Ceramic Muffin Tin
Ceramic non-stick coating
Lower concern; ceramic non-stick with credible PFAS-free claim and MADE SAFE cert.
⚠Risky category by default
Caraway
Perracotta Ceramic Non-Stick 6-Cup Muffin Pan
Ceramic (terracotta/clay base)
Lower concern; ceramic base with third-party MADE SAFE certification supports claim, but verify retailer specs.
⚠Risky category by default
More muffin tins 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.