Ember · Insulated Drink Tumblers
Personalised Ember Cold Tumbler with name or text engraving
Insufficient transparency on internal coatings and seals for confident assessment.
This Ember smart tumbler has stainless steel outside but won't disclose what coats the inside or seals the lid. Internal thermal coatings commonly contain PFAS; no independent testing exists.
The better-graded swap
Contigo
Contigo Ashland Chill 2.0 Stainless Steel Water Bottle
80/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Stainless steel body, unspecified internal coating or lid seals
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What Personalised Ember Cold Tumbler with name is made of, ingredients and materials
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.
What’s concerning
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
Unknown / proprietary coating
A coating is recorded with no disclosed chemistry.
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.
What’s reassuring
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.
The full breakdown
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.
What we don’t know
- Basis
- Model estimate, 35% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Ember has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Insulated Drink Tumblers
Klean Kanteen
20oz TKWide with Café Cap, Tofu
- Stainless steel bottle, stainless steel cap
- The brand calls it PFAS-free, which we have not verified
- Powder-coat cap degradation over time
3 hazards checked on this product. See all of them.
Klean Kanteen
16oz Rise Tumbler
- 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. See all of them.
Klean Kanteen
Insulated TKWide Cap
- 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. See all of them.
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.