Ember · Insulated Travel Drinkware
Personalised Ember Cold Tumbler with name or text engraving
Insufficient transparency on internal coatings and seals for confident assessment.
Ember's smart tumbler uses stainless steel externally but does not publicly disclose the composition of internal thermal coatings or lid seals, which commonly contain PFAS. No third-party PFAS testing available.
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Material
Stainless steel body, unspecified internal coating or lid seals
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 Cold Tumbler uses a stainless steel outer body, which is chemically inert and does not leach metals under normal use. However, the product's safety profile depends entirely on what coats the interior and seals the lid, which Ember has not publicly specified. Cold tumblers typically use food-grade epoxy or polyester liners to prevent condensation staining and protect the stainless steel; some also use silicone or rubber seals. Without disclosure, you cannot verify whether these internal materials meet FDA standards or contain additives like BPA.
The brand's record and disclosure
Ember is known for smart temperature-control drinkware but has not published detailed material safety data sheets or ingredient transparency for this tumbler model. The company maintains a mostly silent stance on PFAS and internal coating composition, which is a red flag in the personal care and drinkware sector where transparency is increasingly expected. No major recalls or safety controversies are on public record for Ember cold tumblers, but the lack of proactive disclosure limits independent verification of safety claims.
How it compares in its category
Most insulated stainless steel tumblers in this price range do not disclose internal coating details either, making Ember typical rather than exceptional in opacity. However, competitors like Hydro Flask and S'well have published more detailed material certifications. A plain stainless steel tumbler without internal liners avoids coating uncertainty entirely but loses the condensation-control benefit; Ember's design trades transparency for performance.
If you buy it
Use only with cold or room-temperature beverages; do not fill with boiling liquid, as unknown internal coatings may leach at elevated temperatures. Hand-wash rather than dishwasher to avoid coating degradation from harsh detergents and heat cycles. Inspect the interior periodically for peeling, discoloration, or damage; if coating degrades, discontinue use. Contact Ember directly to request a safety data sheet for the specific internal materials before purchase if coating leaching is a concern.
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 composition (unspecified)
Ember does not publicly disclose the material or additives in the interior coating or lid seals. If epoxy or polyester-based, these can leach monomers or plasticizers into beverages when degraded or exposed to extended contact with acidic or hot liquids.
Lid seal material and volatiles
The lid sealing mechanism is not specified; silicone and rubber components can off-gas or leach oligomers if low-quality or if exposed to temperature extremes during storage or shipping.
Coating degradation over time
Repeated dishwashing or contact with citric acid (lemon juice, sports drinks) can compromise internal coatings; once damaged, unknown coating material may shed particles or leach into beverages.
Stainless steel corrosion risk
The outer stainless steel body itself is chemically stable and does not leach iron, nickel, or chromium at normal use temperatures, though highly salted or chlorinated liquids stored for weeks could theoretically initiate pitting in lower-grade stainless alloys if not food-grade.
Thermal shock from personalization process
Laser or mechanical engraving on stainless steel does not generate hazardous residues, but the engraving process itself does not affect internal safety if coatings remain intact.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.
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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.