Zojirushi · Insulated Drink Tumblers
Zojirushi Stainless Vacuum Insulated Tumbler
Lower concern; bare stainless steel minimizes PFAS risk.
Stainless steel vacuum tumblers carry inherently lower PFAS risk due to bare metal construction. Interior plastic liner and lid gasket remain potential sources, but typical Zojirushi designs show no evidence of PFAS-containing coatings.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel exterior, vacuum insulation, plastic interior liner
Lab data
No public lab test
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What Zojirushi Stainless Vacuum Tumbler is made of, ingredients and materials
This tumbler uses a double-wall stainless steel exterior (typically 18/8 food-grade steel) with a plastic interior liner and vacuum insulation between layers. Stainless steel is chemically inert and does not leach metals under normal use conditions, unlike ceramic or non-stick coatings which may present this concern. The plastic liner is the primary contact surface with beverages; Zojirushi does not publicly disclose the specific polymer type (likely polypropylene or similar), which is a minor transparency gap but typical for this product class.
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 interior liner composition and leaching
Zojirushi does not publicly identify the specific polymer or additives in the inner plastic layer. Food-contact plastics are regulated in Japan and the US, but without disclosure, potential BPA or phthalate leaching cannot be ruled out, though risk is low under normal cold-beverage use.
Bacterial or mold growth in sealed compartments
Any double-wall vacuum tumbler carries risk of microbial growth if the interior or seal is not dried thoroughly between uses. This is a maintenance issue, not a manufacturing defect, but worth noting for long-term hygiene.
Lid gasket degradation and replacement availability
Over time, rubber gaskets in the lid may degrade, crack, or harbor bacteria. Zojirushi sells replacement lids and gaskets, but older models may become difficult to source, leading to continued use of compromised seals.
What’s reassuring
Bare uncoated material
Recorded as a bare, uncoated material with no surface coating or treatment.
Exterior stainless steel integrity (corrosion or coating loss)
18/8 stainless steel is highly corrosion-resistant and should not leach metals under normal use. No documented cases of external degradation leading to contamination with this product.
Off-gassing or odor from plastic components
No reports of VOC off-gassing or persistent chemical odors from Zojirushi vacuum tumblers. New-product odor is normal and typically dissipates within hours of unpacking.
How is this PFAS grade calculated?
The brand's record and disclosure
Zojirushi is a Japan-based manufacturer with a solid reputation for quality control and durability, though they provide minimal public disclosure on material composition, certifications, or chemical safety testing. No major product recalls or safety controversies involving this tumbler line are documented in public records. The brand does not publish independent third-party safety certifications (e.g., NSF, FDA statements) for this product, which limits verification but does not indicate a problem.
How it compares in its category
Stainless steel tumblers present lower concern than ceramic-coated alternatives (which may contain lead in glazes) or older non-stick models (which carry Teflon-type coating fume risks). Zojirushi's vacuum construction is well-engineered and reduces surface degradation compared to cheaper double-wall designs. Performance and safety profile are comparable to other premium stainless vacuum tumblers (Hydro Flask, S'well) without evidence of material or manufacturing differences.
If you buy it
Use only with cold or moderately warm beverages (not boiling water in contact with the liner for extended periods, though brief use presents no hazard of this kind on record). Hand wash the interior and lid regularly, as prolonged moisture in crevices can promote mold or bacterial growth if left sealed and damp. Replace the lid gasket or tumbler if the exterior dent compromises vacuum seal integrity, as this degrades insulation function. Do not assume the plastic liner is microwave or dishwasher safe without checking the product manual; most Zojirushi tumblers recommend hand wash only.
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 Vacuum Insulated Tumbler?
- Stainless steel bottle, stainless steel cap
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- 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.