Zojirushi · Insulated Drink Tumblers
Zojirushi Stainless Steel Vacuum Insulated Tumbler 0.72L
Low risk. Stainless steel poses minimal PFAS concern.
Zojirushi vacuum tumblers use stainless steel without known PFAS-bearing coatings. The brand hasn't disclosed PFAS status, but material type suggests lower risk.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Stainless steel with vacuum insulation
Lab data
No public lab test
What Zojirushi Stainless Steel Vacuum is made of, ingredients and materials
This tumbler uses food-grade stainless steel (typically 18/8 or 18/10 austenitic steel) as the primary contact surface, which is highly resistant to corrosion and leaching across normal use temperatures. The vacuum insulation between double walls is an air gap (not a chemical foam), eliminating off-gassing concerns common in some thermal containers. Stainless steel does not require polymer coatings, glazes, or enamel finishes that could degrade or leach harmful compounds over time.
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.
Stainless steel corrosion and nickel leaching
Low-quality stainless steel or damage to the surface can permit minimal nickel release in acidic beverages (citrus, vinegar, wine). Food-grade 18/8 steel in this product class is resistant but not immune; integrity matters. Risk is negligible for most users but relevant for those with nickel sensitivity.
Gasket and cap material degradation
Rubber gaskets and silicone seals in Zojirushi tumblers can crack or degrade with age and repeated dishwasher exposure. No chemical leaching from gaskets has been documented, but physical failure can compromise the seal and allow water ingress into the vacuum space.
Thermal shock and double-wall separation
Rapid temperature extremes (hot liquid immediately followed by submersion in ice water) can theoretically stress the seal between inner and outer walls. Long-term consequence is loss of insulation rather than chemical hazard, but rarely reported in this product line.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Coating or paint on exterior
Zojirushi stainless steel tumblers typically have minimal exterior coating; powder coat or paint, if present, is not in contact with beverage and poses no ingestion hazard under normal use. No recalls or complaints on record.
The full breakdown
The brand's record and disclosure
Zojirushi has a established reputation for quality small appliances and drinkware, with no public product recalls or safety violations on record for this tumbler model. The brand does not proactively disclose PFAS testing or certification, consistent with most stainless steel drinkware manufacturers; however, stainless steel construction itself carries inherently lower PFAS risk compared to coated or polymer-based alternatives. No major controversies or warning letters from regulatory agencies are documented for Zojirushi drinkware.
How it compares in its category
Stainless steel tumblers have lower concern for leaching compared to plastic, ceramic, or coated aluminum alternatives, and offer durability benefits. This product sits in the mid-to-premium tier; comparable models from Hydro Flask, S'well, and Contigo use similar stainless steel construction with equivalent safety profiles. The vacuum insulation design avoids the risk of internal coating failure seen in some cheaper thermal containers.
If you buy it
Hand wash rather than dishwasher to preserve the rubber gasket and cap seals, which can degrade if exposed to sustained heat. Avoid filling with liquids above 60C (140F) repeatedly, as extreme thermal cycling may eventually compromise the vacuum seal. Replace the lid or gasket if cracks or permanent deformation appear. Store dry and empty when not in use to prevent mineral buildup from tap water inside the vacuum chamber.
What we don’t know
- 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.
Better-graded alternatives in Insulated Drink Tumblers
Klean Kanteen
20oz TKWide with Café Cap, Tofu
- 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. See all of them.
Klean Kanteen
16oz Rise Tumbler
- 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. See all of them.
Klean Kanteen
Insulated TKWide Cap
- 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. See all of them.
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.