Zojirushi · Insulated Drink Tumblers
Zojirushi Stainless Steel Travel Mug
Low concern. Stainless steel mugs typically lack PFAS-prone coatings.
Zojirushi's stainless steel travel mugs lack reported PFAS-related coatings. The brand doesn't disclose PFAS status, but stainless steel itself carries lower risk than treated alternatives.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel interior and exterior
Lab data
No public lab test
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What Zojirushi Stainless Steel Travel Mug is made of, ingredients and materials
Zojirushi stainless steel travel mugs feature a dual-wall stainless steel interior and exterior with an air gap for insulation, eliminating ceramic glazes, non-stick coatings, or polymer linings that typically introduce chemical leaching risks. The lid and seal components are typically plastic (polypropylene or similar) and rubber gaskets, which are common in this category but warrant attention to temperature exposure. Stainless steel itself is inert and does not leach metals into beverages under normal use conditions.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Polymer lid and gasket degradation
Plastic lid components and rubber gaskets may degrade with repeated temperature cycling and dishwasher use, potentially releasing microplastics or allowing bacterial growth in crevices if seals fail. This is common to most insulated travel mugs and is manageable through regular inspection and part replacement.
Unlabeled material composition of gasket and lid
Zojirushi does not always publicly specify whether lid seals contain silicone, latex, or synthetic rubber, or whether plastic lids are polypropylene or other polymers. This limits ability to assess suitability for individuals with specific material sensitivities.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel corrosion from acidic beverages
No reported leaching of chromium, nickel, or iron from Zojirushi stainless steel mugs into beverages. Food-grade stainless steel (typically 304 or 18/8 alloy) is passivated to resist corrosion, though extremely acidic liquids left standing for extended periods could theoretically initiate surface degradation.
Thermal conductivity of lid/seal at temperature extremes
While the stainless steel body insulates well, the plastic lid and rubber gasket conduct heat more readily and may reach uncomfortable or unsafe temperatures when filled with boiling beverages. This is a design limitation rather than a chemical hazard but warrants awareness for burn risk.
How is this PFAS grade calculated?
The brand's record and disclosure
Zojirushi is a Japanese appliance manufacturer with a strong reputation for quality and durability in the drinkware category, though the company does not publish detailed chemical disclosure statements for consumer products. No recalls or significant safety controversies related to this product line appear in public records. The brand does not actively advertise PFAS-free status, though the stainless steel construction inherently avoids PFAS-prone Teflon-family coating coatings.
How it compares in its category
Stainless steel travel mugs have lower concern for PFAS compared to plastic insulated bottles (which may contain BPA or other polymers) or vacuum-insulated mugs with polymer linings. Zojirushi's construction is comparable to other premium stainless steel brands like Hydro Flask or S'well in terms of material safety. The main trade-off is that stainless steel conducts heat more readily than some competitor designs, though dual-wall construction mitigates this.
If you buy it
Inspect the lid seal and gasket regularly for cracks or discoloration, as these polymer components degrade with repeated dishwashing and temperature cycling. Do not expose the mug to extreme temperature shocks (e.g., moving from freezer to boiling water), as this can weaken seals. Hand wash rather than dishwash if possible to extend gasket life. Replace the lid assembly if the seal becomes loose or the gasket hardens, as replacement parts are widely available for Zojirushi products.
What is not known about PFAS in this product?
- Basis
- Model estimate, 78% 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 Stainless Steel Travel Mug?
- 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.