Thermos · Insulated Travel Mugs
Thermos Icon 16 oz Stainless Steel Mug
Lower concern; bare stainless steel has minimal PFAS risk.
Thermos Icon uses stainless steel construction with no disclosed coatings or treatments. Bare stainless steel poses lower PFAS concern than coated alternatives.
We flunk more products than we pass. This one earned its grade. How we grade
Material
stainless steel, no stated interior coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
Seal degradation and bacterial growth
The rubber gasket or silicone seal can degrade after 3-5 years of repeated thermal cycles and washing, potentially trapping moisture or food particles. This is a maintenance issue rather than a chemical hazard, but a failing seal can harbor bacteria if not cleaned thoroughly or replaced.
Lid or cup material (not specified)
Thermos Icon lids typically use plastic (polypropylene or similar) or silicone. If plastic, no documented BPA use in modern Thermos lids has been reported, but specifications are not always publicly detailed. Confirm lid material with the manufacturer or product tag if this is a concern.
What’s reassuring
Uncoated safe material
Bare cast iron, stainless steel, carbon steel, or glass with no PFAS coating.
Stainless steel leaching (nickel, chromium)
Bare 18/8 stainless steel is highly corrosion-resistant and does not leach nickel or chromium into neutral or slightly acidic beverages under normal conditions. Prolonged storage of very acidic liquids (pH below 3) could theoretically mobilize trace metals, but no recalls or documented health incidents exist for Thermos stainless mugs.
Coating or enamel on exterior (if present)
The Icon model uses brushed or matte stainless steel finish with no stated enamel or powder-coat layer. If a colored variant uses a paint or enamel topcoat, that would require inspection for lead or cadmium in pigments, but standard Thermos Icon models are bare stainless and pose no coating-related risk.
Thermal stress on seal integrity
Repeated exposure to boiling water or extreme temperature swings can stress the seal over time, but this is a mechanical durability issue, not a chemical safety hazard. The mug remains safe to use even if insulation performance declines.
The full breakdown
What it's made of and why it matters
The Thermos Icon 16 oz uses food-grade stainless steel (typically 18/8 or 18/10 chromium-nickel alloy) as both the outer and inner vessel, with a vacuum-sealed air gap for insulation. Unlike ceramic mugs with glazes or plastic liners with coatings, bare stainless steel has no organic resin layers that can degrade or leach chemicals into beverages. Stainless steel is chemically inert under normal use conditions and does not off-gas volatile compounds.
The brand's record and disclosure
Thermos is owned by Groupe SEB and has manufactured insulated drinkware for over a century with no documented safety recalls specific to material leaching in this product line. The company does not publish detailed material certification statements for this model, but stainless steel drinkware is a mature, well-regulated category with established food-contact standards. No controversies regarding heavy metals, coatings, or chemical contamination have been reported for Thermos stainless steel beverage containers in public records.
How it compares in its category
Among reusable drinkware, bare stainless steel is one of the lowest-risk options. Ceramic mugs carry glaze-leaching concerns; plastic alternatives introduce BPA or other polymers depending on material; coated steel mugs (powder coat or enamel) can fail over time. The Thermos Icon's vacuum construction and simple stainless design avoid the complexity of multi-layer coatings that degrade with thermal cycling.
If you buy it
Hand wash rather than dishwasher to preserve any exterior finish and avoid thermal shock. Inspect the seal annually; if the vacuum seal fails, insulation drops but the mug remains safe for cold or room-temperature drinks. Avoid prolonged contact with highly acidic beverages (lemon juice, vinegar) or chlorinated water if stored for days, as stainless steel can develop surface discoloration over decades, though this is cosmetic. Do not use for boiling liquid transfers that create extreme thermal stress on the seal.
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
- Thermos has made none
Formulations change between production runs, so check the current label. How we grade.
More insulated travel mugs 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.