Mercer · Non-Stick Knife Sets
Mercer Culinary Genesis 6-Piece Glass Knife Block Set
Lower PFAS concern, glass and stainless steel are inherently PFAS-free materials.
This product is a glass storage block with stainless steel blades, neither of which require PFAS coatings to function. Glass and stainless steel are inert, well-established materials with no known PFAS risk. No public disclosure about PFAS is needed because the materials themselves pose negligible concern.
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Glass knife block with stainless steel knives
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
cookware is a category where PFAS exposure is more common.
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 uses a solid glass knife block paired with stainless steel blades. Glass is chemically inert and does not leach compounds into food or air when heated or scratched, eliminating common coating risks like Teflon-type coating fume release or lead in ceramic glazes. Stainless steel blades (typically 400-series or better in Mercer products) do not corrode or shed particles under normal kitchen use, and are not treated with non-stick coatings that degrade over time.
The brand's record and disclosure
Mercer Culinary is a US-based commercial foodservice knife manufacturer with decades of market presence. The company does not publicly disclose detailed material safety testing or third-party certifications for residential products, nor does it make explicit PFAS or heavy-metal commitments. No recalls, safety violations, or contamination incidents are on record for this glass-and-steel product line. The brand's silence on safety documentation is typical for mid-tier cutlery manufacturers but does not indicate a known problem.
How it compares in its category
Glass blocks are safer than wooden or plastic alternatives because they do not harbor bacteria, off-gas volatile organic compounds, or absorb odors and stains. Compared to ceramic or resin-composite blocks, glass avoids glaze-based lead/cadmium leaching and long-term coating degradation. Mercer's stainless steel blades are standard-grade for home use and comparable to competitors in the mid-market segment (Victorinox, Wusthof). The set's main trade-off is weight and breakage risk of glass versus the durability of wood or plastic.
If you buy it
Handle the glass block carefully to avoid cracks or chips, which can create sharp edges and compromise the block's structural integrity. Wash the block and knives by hand; most glass blocks are not dishwasher-safe and thermal shock can cause cracking. Store knives with blade guards if not using the block, and inspect blade edges and block surface regularly for damage. Stainless steel requires periodic hand-drying to prevent water spots and corrosion at the blade base, especially if exposed to high-salt foods.
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.”
Glass breakage and sharp edges
Glass blocks can crack if dropped, exposed to thermal shock (rapid temperature changes), or if knives are forced into slots. Cracks or chips create sharp edges and may degrade the block's ability to safely hold knives. This is a mechanical risk rather than a chemical one.
Stainless steel corrosion and leaching
Food-grade stainless steel (300-series alloys) used in Mercer knives does not leach nickel, chromium, or iron under normal cooking conditions. Corrosion only occurs if the steel is consistently exposed to salt or acidic foods without drying, which is a durability issue, not a health hazard at typical exposure levels.
Bacterial growth in block slots
Glass is non-porous and easier to sanitize than wood or plastic, but food debris and moisture can accumulate in blade slots if not cleaned thoroughly after each use. This is a hygiene maintenance issue, not an inherent material hazard.
Lead or cadmium in block coating or adhesives
Glass blocks do not require glazes, enamels, or ceramic coatings that typically contain lead or cadmium. No adhesives or sealants are known to be used in Mercer's standard glass blocks, so this hazard class is not applicable to this product design.
Thermal stability under heat
Glass and stainless steel are stable at all normal kitchen temperatures. The block should not be placed directly on hot stovetops or in ovens, but this is a design limitation, not a chemical leaching risk.
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 Non-Stick Knife Sets
GreenPan
Bobby Flay Knife Block Set
stainless steel knives and wooden block
Lower concern, stainless steel knives with wood are inherently PFAS-low, though no third-party verification exists.
⚠Risky category by default
GreenPan
Elite Cutlery Knife Block Set
stainless steel blades and handles
Lower-concern product, stainless steel knives are inherently PFAS-free; brand stance supports this.
⚠Risky category by default
More non-stick knife sets 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.