Ember · Insulated Travel Drinkware
Ember Tumblers - Set of 4
Lower PFAS concern; stainless steel drinkware rarely treated.
Ember tumblers are double-wall stainless steel insulated drinkware. No PFAS-related coatings typical for this material type, though brand discloses nothing about PFAS explicitly.
Shop Ember on Amazon →Material
Stainless steel double-wall insulated
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
other is a category where PFAS exposure is more common.
The full breakdown
What it's made of and why it matters
Ember Tumblers are constructed from stainless steel with a double-wall vacuum-insulated design. Stainless steel (typically 18/8 or 304 grade) is inert and does not leach problematic compounds into beverages under normal use. The air gap between walls poses no chemical hazard; the concern with double-wall designs is structural durability (separation over time), not material toxicity.
The brand's record and disclosure
Ember maintains a silent public stance on PFAS testing and material certifications. No product recalls, safety warnings, or third-party certifications (e.g., NSF, FDA food-contact verification) are publicly documented for this product line. The brand focuses marketing on insulation performance rather than safety transparency, which is typical for drinkware but limits independent verification.
How it compares in its category
Stainless steel tumblers rank among the safest insulated drinkware options, avoiding ceramic glaze contamination risks, Teflon-type coating non-stick degradation (found in some coated alternatives), and plastic leaching concerns. Vacuum-insulated stainless steel products from established brands show no consistent safety issues in published consumer or regulatory data; Ember's design is standard in this category.
If you buy it
Hand wash rather than dishwasher to preserve the double-wall seal and prevent premature separation. Avoid high-impact drops, which can crack the inner wall or compromise the vacuum seal without obvious external damage. Check the seal periodically (condensation on the exterior or loss of insulation indicates failure); at that point, the tumbler should be replaced. Use with any beverage temperature; stainless steel has no thermal limits relevant to safety.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Double-wall separation and structural failure
Over time or after impact, the inner and outer walls may separate, allowing liquid into the void space. This is a durability issue rather than a chemical hazard, but compromised seals can trap moisture and promote mold growth if the product is stored damp.
Metal leaching from stainless steel
High-quality 304 stainless steel does not leach iron, chromium, or nickel into beverages at normal pH and temperature. No documented cases of leaching from Ember tumblers or similar products exist in public safety databases.
Coatings or interior linings (if present)
No information is publicly available indicating that Ember Tumblers use epoxy, polymer, or ceramic linings that could degrade or leach. The standard design is bare stainless steel interior, which poses no coating hazard.
Lid seals and gasket materials
Many insulated tumblers include rubber or silicone gaskets in lids; these can harbor bacteria if not cleaned regularly and may degrade over time, though they do not leach toxic compounds under normal use. Ember's specific lid composition is not disclosed; replace lids if visibly degraded or if odor develops.
Nickel sensitivity from stainless steel contact
Individuals with severe nickel contact dermatitis may experience reactions from prolonged lip or mouth contact with stainless steel tumblers, though this is rare and typically occurs only with direct skin contact over time, not from drinking.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More insulated travel drinkware 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.