Zojirushi · Insulated Drink Tumblers
Zojirushi Stainless Steel Carry Tumbler
Lower PFAS concern; bare stainless steel drink container.
Zojirushi stainless steel tumblers are uncoated stainless steel with no reported PFAS treatments. No special coatings or nonstick surfaces are used.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel body, no nonstick or special coating mentioned
Lab data
No public lab test
You may also be interested in
Top-graded picks in the categories readers replace first, every one scored on the same rubric.
- polypropylene filter housing, carbon/sediment cartridge
- We found no PFAS statement from the brand
- Bacterial growth in spent cartridges
3 hazards checked on this product, all on its full breakdown.
Aquasure
Premier Series 75 GPD Under Sink Reverse Osmosis Water Filtration System
- RO membrane, carbon filters, stainless steel housing
- We found no PFAS statement from the brand
- Bacterial and microbial growth in housing and filters
4 hazards checked on this product, all on its full breakdown.
Avocado
Vegan Mattress
- organic cotton, natural latex, coconut coir, recycled steel coils
- The brand calls it PFAS-free, which we have not verified
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
What Zojirushi Stainless Steel Carry Tumbler is made of, ingredients and materials
This tumbler uses food-grade stainless steel (typically 18/8 or 304 grade) as both the inner and outer body, with no nonstick Teflon-type coating, ceramic glaze, or enamel layer. Stainless steel is chemically inert in typical use and does not leach heavy metals or endocrine disruptors into beverages at normal temperatures. The absence of a coating eliminates risks associated with coating degradation that plague many insulated drinkware products.
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.
Seal and gasket degradation
Rubber or silicone seals in the lid can degrade with age and exposure to hot liquids, potentially releasing oligomers or odor compounds. This is a wear-and-tear issue, not an acute safety hazard, and replacement gaskets are typically available. Monitor seals for cracking, discoloration, or off-odors after 2-3 years of heavy use.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Stainless steel leaching (nickel, chromium)
Properly manufactured food-grade stainless steel (304/18-8) does not leach nickel or chromium into neutral beverages under normal use. Acidic beverages (vinegar, citrus juice, wine) can slightly increase migration, but documented risk to users is negligible with short contact times typical of drinking containers. No recalls or complaints on record for Zojirushi tumblers.
Coating on interior insulation layer (if present)
If the double-wall design includes a vinyl or polymer heat-reflective coating on the inner wall (as some insulated tumblers do), this material is not in contact with beverages and poses minimal risk. Zojirushi does not advertise coatings on their stainless steel tumblers, and the design appears to rely on the stainless steel air gap itself for insulation.
Microplastic or particle generation
Solid stainless steel does not generate microplastics during normal use. Interior surface is smooth and resistant to erosion or flaking under typical drinking conditions. No mechanism for particle generation is present in this product.
Thermal safety (heat retention causing burns)
The tumbler's primary design feature is excellent heat retention, which means it keeps hot beverages very hot for extended periods. This is not a material hazard but a user behavior consideration; adults and children should handle the exterior with care when filled with hot liquid. Standard usage precautions apply as with any insulated beverage container.
How is this PFAS grade calculated?
The brand's record and disclosure
Zojirushi is a Japanese manufacturer with a strong reputation for thermal insulation engineering and has not faced public safety recalls or litigation involving their tumbler lines. The company does not prominently advertise third-party safety certifications (such as FDA migration testing results) on consumer-facing materials, but stainless steel drinkware is generally exempt from stricter FDA migration protocols due to the material's established inertness. No documented controversies regarding material safety exist in public sources.
How it compares in its category
Bare stainless steel tumblers have lower concern for coating and lining hazards compared to ceramics with glazes, enameled steel, and polymer-lined bottles. Unlike many insulated tumblers that use plastic or epoxy linings that may contain BPA or other leachables, this product's all-metal design poses minimal chemical migration risk. This places it in the lower-risk segment of the drinkware market.
If you buy it
Stainless steel tumblers are durable and require minimal special care beyond hand washing or standard dishwasher cycles, though hand washing preserves the finish longer. Do not expose the tumbler to extreme temperature shocks (very hot liquid followed by ice water immediately) as thermal stress can crack the seal gaskets over time. Replace gaskets or seals if you notice leaking or degradation after years of use. The product is suitable for hot and cold beverages and does not require special maintenance beyond drying after washing.
What is not known about PFAS in this product?
- Basis
- Model estimate, 88% 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 Carry Tumbler?
- 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.