Zojirushi · Insulated Drink Tumblers
Stainless Steel Travel Mug Zojirushi
Low risk, stainless steel core. Lid material not specified.
Zojirushi travel mugs feature stainless steel construction with inherently lower PFAS risk. No brand PFAS claims exist; plastic lid composition remains undisclosed.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel interior, plastic lid
Lab data
No public lab test
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What Stainless Steel Travel Mug Zojirushi is made of, ingredients and materials
Zojirushi travel mugs use food-grade 18/8 stainless steel (304 or 316 grade) for the interior, which is chemically inert and does not leach metals into beverages under normal use. The lid and seals are plastic, likely polypropylene (PP) or similar, which are lower-risk polymers but warrant temperature management. The interior stainless steel construction is the primary safety advantage here, as it sidesteps the leaching concerns present in ceramic or aluminum-lined alternatives.
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.
Plastic lid and seal degradation
Polypropylene and elastomer seals are not specified by Zojirushi in most product literature. Over time, repeated temperature cycling and contact with hot liquids can cause microscopic cracking or leaching of oligomers; specific migration data for this lid material is not publicly available.
Bacterial biofilm in lid threads and seals
Travel mug lids are well-documented as difficult-to-clean, and Zojirushi's design includes narrow threads and rubber gaskets where pathogens can colonize if not disassembled and dried completely after each use. Not unique to this brand but a category-wide risk.
Thermal shock cracking of double-wall seal
If the mug is filled with boiling water and then immediately exposed to freezing temperatures, the vacuum seal integrity between walls can degrade, compromising insulation but not directly creating a chemical hazard. No specific failure rates reported for Zojirushi models.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel nickel release
Food-grade 18/8 stainless steel (304) in contact with drinking water poses negligible nickel leaching under normal pH and temperature conditions. No recalls or testing reports suggest nickel migration from Zojirushi mugs; FDA regulations permit stainless steel for food contact without restrictions.
Coating or manufacturing residues on interior
Zojirushi does not apply interior coatings to its stainless steel models, reducing the risk of peeling enamel or ceramic residue. Standard manufacturing (pickling, passivation) leaves a passive oxide layer with lower concern for beverage contact and does not off-gas or migrate.
How is this PFAS grade calculated?
The brand's record and disclosure
Zojirushi is a Japanese manufacturer with a long history in thermal tableware and does not publicly disclose detailed material safety testing or third-party certifications on PFAS or other contaminants. The brand has not faced major food-contact recalls related to chemical contamination. Limited transparency on supply chain testing or material sourcing standards, but no established controversies in independent testing.
How it compares in its category
Stainless steel interiors present lower concern than ceramic-lined, aluminum, or copper-lined travel mugs, which can leach metals under acidic conditions or with coating wear. Most plastic-lidded travel mugs present similar concerns around lid material and seal degradation. Zojirushi's thermal performance is industry-standard; safety profile sits in the middle-to-upper range due to stainless steel core, but lid opacity is a shared weakness across the category.
If you buy it
Hand-wash the lid and seals regularly to prevent bacterial biofilm accumulation in crevices; most plastic lids are not dishwasher-safe. Avoid filling with boiling water if the lid is sealed (pressure can degrade seals over time). Replace the lid gasket every 1-2 years if it becomes discolored, cracked, or loses its seal. Do not use for prolonged storage of acidic beverages (citrus, vinegar) beyond 24 hours, as even stainless can show minor pitting with repeated exposure.
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 Stainless Steel Travel Mug Zojirushi?
- 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.