Komax · Food Storage Containers
Komax Ovenglass Food Container
Lower-concern choice, borosilicate glass containers avoid common PFAS sources.
Komax Ovenglass containers are borosilicate glass, which is inherently free from PFAS coatings and Teflon-family coating treatments. The brand makes no PFAS claim, but the material itself carries minimal PFAS risk. Lids may contain gaskets or seals, check those separately if they're not silicone or glass.
Shop Komax on Amazon →Material
borosilicate glass
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
Komax Ovenglass containers are made from borosilicate glass, a silica-based material with low thermal expansion and high melting point. Borosilicate glass does not leach heavy metals, BPA, or plastic degradation byproducts into food, even when heated or microwave-used. This material is chemically inert, meaning it does not interact with acidic, fatty, or hot foods. The glass is also non-porous and does not harbor bacteria or off-gas volatile organic compounds over time.
The brand's record and disclosure
Komax is a consumer kitchenware brand with no publicly documented recalls or safety violations on record for Ovenglass containers. The brand does not actively publish detailed material safety disclosures or third-party certifications (e.g., NSF, FDA compliance statements) on their website or packaging. No established controversies or regulatory actions against Komax relating to food-contact safety have been reported in public health databases or consumer safety organizations.
How it compares in its category
Borosilicate glass containers like Komax are among the safest food storage options available, competing favorably against plastic containers (which risk BPA, phthalate, or microplastic leaching) and ceramic containers (which may have lead in glazes). Komax products are typically priced in the mid-range for glass storage, comparable to brands like Pyrex and Rubbermaid Brilliance but often less expensive than premium brands like Anchor Hocking. Glass containers require careful handling (breakage risk) and do not offer the lightweight portability of plastic alternatives.
If you buy it
Borosilicate glass is oven-safe and microwave-safe up to manufacturer specifications (typically 350-400 degrees Fahrenheit; check your product label). Avoid rapid temperature changes (e.g., moving directly from freezer to hot oven) to prevent thermal shock and cracking. Inspect the lids for wear; if they are plastic, replace them if discolored, cracked, or no longer seal properly, as plastic components degrade faster than glass. Hand-wash or place on the top rack of the dishwasher to minimize mechanical stress.
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
Although borosilicate glass is heat-resistant, rapid temperature swings can cause cracking or shattering. This is a mechanical rather than chemical hazard but affects safe use.
Plastic lid leaching (if applicable)
If Komax Ovenglass lids contain polycarbonate or other plastics, repeated heating or dishwasher cycles may cause minor BPA or phthalate migration. Check lid material on packaging; many manufacturers now use BPA-free plastics.
Lead or cadmium in glass formulation
Borosilicate glass used in food containers does not typically contain lead or cadmium as deliberate ingredients. No testing or recall data suggests Komax Ovenglass contains these metals, though independent lab verification is not publicly available.
Chipping or edge degradation
Over time or after impact, glass rims or interior surfaces may chip, creating sharp edges and small glass fragments. This is primarily a physical injury risk rather than a toxicological one, but fragments could contaminate food.
Microorganism growth on seals
Plastic gasket or silicone seals on lids can trap moisture and develop mold or bacterial biofilms if not dried thoroughly after washing. Regular inspection and replacement of worn seals minimizes this risk.
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.