Zojirushi · Insulated Drink Tumblers
Zojirushi 27 oz. Stainless Mug/Water Bottle with Lid Handle
Low concern. Bare stainless steel poses minimal PFAS risk.
Zojirushi's stainless steel bottle and lid contain no intentional nonstick or water-resistant treatments requiring PFAS. Plastic and stainless steel components create lower PFAS concern for beverage use.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel interior and exterior, lid with handle
Lab data
No public lab test
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What Zojirushi 27 oz. Stainless Lid Handle is made of, ingredients and materials
This mug uses food-grade stainless steel (typically 18/8 or 18/10 alloy) for both interior and exterior walls, which is chemically inert and does not leach metals into beverages at normal use temperatures. The lid likely contains polypropylene (PP) or polyacetal (POM) plastics and a silicone gasket. Unlike ceramic-coated or non-stick metal drinkware, bare stainless steel avoids risks from degraded coatings or polymer breakdown.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Lid and gasket material degradation (polypropylene/polyacetal/silicone)
Plastic lid components and silicone gaskets can degrade over years of use, especially with exposure to heat cycles or UV light. While polypropylene and polyacetal do not readily leach BPA (they contain neither), old gaskets may develop cracks that harbor bacteria if not maintained.
Bacterial growth in lid seams and gasket
If the lid is not disassembled and cleaned regularly, water can stagnate in the seal area between the lid and gasket, creating a microenvironment for mold or bacterial growth. This is not a material hazard but a maintenance failure.
Off-gassing or odor from lid plastics
New polypropylene or polyacetal lids may emit a mild plastic smell when first used, particularly if exposed to hot water. This typically resolves within days to weeks and does not indicate a safety hazard; it is outgassing of volatile residues from manufacturing.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel leaching under acidic conditions
Food-grade stainless steel is highly resistant to corrosion and leaching. No established risk of nickel or chromium release into neutral or slightly acidic beverages has been documented for standard stainless drinkware under normal use.
Coating or enamel hazards
This product has no ceramic coating, powder coat, or enamel on the interior or exterior. All contact surfaces are bare stainless steel, which eliminates risks from lead, cadmium, or coating flaking.
How is this PFAS grade calculated?
The brand's record and disclosure
Zojirushi is a Japanese appliance manufacturer with a long history in thermal drinkware and is not known for major product safety controversies or recalls affecting their water bottles or mugs. The brand does not publicly disclose detailed material certifications or test reports for this specific product, but stainless steel drinkware from established manufacturers typically undergoes standard food-contact compliance testing. No regulatory actions or widespread complaints regarding leaching or toxins have been documented for Zojirushi stainless mug lines.
How it compares in its category
Stainless steel water bottles have lower concern for coating degradation compared to ceramic-lined or powder-coated alternatives. This product sits in the mid-to-premium tier of stainless bottle construction and is comparable to brands like Hydro Flask or Klean Kanteen in material safety profile, though without explicit third-party certification statements. Plastic lids carry minimal risk at normal use temperatures but are less inert than the bottle itself.
If you buy it
Hand wash the lid and gasket regularly to prevent bacterial growth in crevices, and inspect the silicone seal annually for cracks or discoloration. Do not expose the lid plastics to prolonged boiling or dishwasher heat above 140F, as this can degrade POM or PP over time. The stainless steel bottle itself is durable and will not degrade; replace only if denting compromises insulation. Avoid storing acidic beverages (lemon water, vinegar) for extended periods, as even stainless can show minor surface etching with prolonged contact.
What is not known about PFAS in this product?
- Basis
- Model estimate, 82% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Zojirushi has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Zojirushi 27 oz. Stainless Mug/Water Bottle with Lid Handle?
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product, all on its full breakdown.
- Stainless steel body, powder-coat finish
- The brand calls it PFAS-free, which we have not verified
- Powder-coat finish degradation
3 hazards checked on this product, all on its full breakdown.
- Stainless steel bottle, plastic cap and silicone gasket
- The brand calls it PFAS-free, which we have not verified
- Silicone gasket degradation and leaching
3 hazards checked on this product, all on its full breakdown.
More insulated drink tumblers 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.