Ember · Insulated Travel Drinkware
Personalized Ember Tumbler - Slate Black / 16 oz
Ember silent on PFAS. Internal coating composition undisclosed.
Ember's smart tumbler uses stainless steel exterior but does not publicly disclose the coating formula inside the cup. No PFAS claim or testing data available from the brand.
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Material
Stainless steel body, proprietary internal coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Unknown / proprietary coating
Proprietary coating with no disclosed chemistry.
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
The Ember tumbler uses a stainless steel exterior (inherently stable and non-leaching) paired with a proprietary internal coating that Ember has not publicly disclosed. This internal coating is critical because it contacts hot beverages directly and controls thermal conductivity and flavor transfer. Without specification of the coating material, polymer type, or additives, it is impossible to rule out leaching or degradation risks under normal or prolonged use.
The brand's record and disclosure
Ember markets premium smart drinkware but has maintained silence on material composition, PFAS content, and third-party safety certifications. The company has not published ingredient disclosures, safety data sheets for coatings, or responses to consumer inquiries about chemical composition. This absence of proactive transparency is a red flag in an industry where coating safety is well-established as a consumer concern.
How it compares in its category
Smart tumblers are a niche product; most competitors (Contigo, Hydro Flask, YETI) disclose stainless steel + food-grade polymer or ceramic liners and provide material safety documentation. Ember's refusal to specify its proprietary coating places it outside normal disclosure norms for drinkware. Standard insulated tumblers with transparent liners or ceramic coatings carry less uncertainty.
If you buy it
Do not expose to prolonged heat above manufacturer specifications (check documentation). Inspect the interior coating regularly for scratches, peeling, or discoloration; discontinue use if coating degrades. Hand wash only; avoid abrasive scrubbing or dishwasher. Request written material safety documentation from Ember before purchase if you have sensitivities. Consider a competing brand with published coating specifications if chemical transparency is important to you.
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.”
Internal coating leaching or degradation
Proprietary coating composition is undisclosed. Polymer or resin coatings can leach additives or break down under hot beverage contact if not food-grade certified. No published test data or certification standard provided by Ember.
Coating adhesion and microparticle shedding
If the internal coating uses an adhesive or is multi-layered, mechanical stress from thermal cycling or impact could cause flaking. Ember does not address durability specifications or what happens if coating fails.
Heavy metal transfer from coating pigments or additives
No recalls or complaints on public record for Ember tumblers involving lead, cadmium, or other heavy metals. However, lack of published coating composition means heavy metal pigments cannot be ruled out.
Thermal conductivity mismatch and heat exposure
The internal coating's thermal properties are unspecified. If coating or adhesive has a lower melting point than stainless steel, sustained contact with boiling water could compromise integrity. Manufacturer heat limits should be followed strictly.
PFAS in coating formulation
Ember is silent on PFAS. Proprietary coatings in food-contact products sometimes contain PFAS for non-stick or water-repellent properties. Absence of disclosure does not exclude presence.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% 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.
Safer alternatives in Insulated Travel Drinkware
Ember
Cold Tumbler
stainless steel with silicone seal
Lower concern; stainless steel tumbler unlikely to contain PFAS.
✓Naturally PFAS-free material
Ember
Tumblers - Set of 4
Stainless steel double-wall insulated
Lower PFAS concern; stainless steel drinkware rarely treated.
✓Naturally PFAS-free material
Ember
Cup 14 oz Slate Black
Ceramic or ceramic-coated stainless steel with heated base
Lower concern. Smart cup uses ceramic coating, not Teflon-type coating nonstick.
✓Naturally PFAS-free material
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.