Xiaomi · Waterproof Smartwatches & Fitness Trackers
Xiaomi Smart Band 9
Waterproof wearables may use PFAS; Xiaomi silent on specifics.
Xiaomi Smart Band 9 contains a waterproof coating but the brand discloses no PFAS information. Waterproof wearables commonly use PFAS-based treatments; no third-party verification available.
The safe swap
Swatch
Swatch Chrono 42 Quartz Watch
85/100 safety
Same rubric that flunked this product. The swap earned its B.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Silicone band with stainless steel case, waterproof coating
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
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 Xiaomi Smart Band 9 uses a silicone elastomer band paired with a stainless steel case and unspecified waterproof coating. Silicone is chemically inert and non-toxic at body temperature; stainless steel (typically 304 or 316 grade) does not leach under normal wear. The waterproof treatment applied to the band or seals is the material wild card: manufacturers typically use fluorochemical coatings (PFAS-based) or polyurethane-based water repellents, and Xiaomi has not disclosed which.
The brand's record and disclosure
Xiaomi has not published material safety data sheets, PFAS policies, or third-party certification for the Band 9. The company does not appear on public PFAS-free commitment lists. Xiaomi's general transparency on consumer health and chemical use lags behind leaders like Patagonia or Apple, though no major recalls or chemical controversies have been documented for wearables specifically. For a device worn directly on skin, this silence is a notable gap.
How it compares in its category
Among fitness trackers and smartwatch bands, Xiaomi's use of silicone and stainless steel mirrors the industry norm (Fitbit, Garmin, and Apple do the same). However, competitors like Apple publish more detailed material sourcing and have committed to phasing PFAS out of product coatings by 2025. Xiaomi's Band 9 is mid-market in safety transparency; it is not worse than generic Chinese brands but lags premium Western alternatives.
If you buy it
Wear time is low-risk: silicone does not off-gas at skin temperature, and the closed waterproof design limits direct chemical contact. Avoid prolonged contact with harsh detergents or solvents, which can degrade the waterproof coating. If the band shows cracking, peeling, or discoloration after 1-2 years, replacement is advisable to maintain the seal integrity. Wash regularly with plain water and mild soap; do not submerge in very hot water.
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.”
Waterproof coating composition (PFAS likelihood)
Xiaomi has not disclosed whether the waterproof treatment uses PFAS-based fluorochemicals or alternative chemistry. Waterproof wearables often rely on PFAS; absence of a public commitment to PFAS-free coatings suggests fluorochemicals may be present.
Stainless steel leaching
Grade 304 or 316 stainless steel does not leach nickel or chromium under normal skin contact at room temperature. No recalls or complaints have been documented for this product.
Silicone band degradation and additive migration
Silicone bands may contain plasticizers or UV stabilizers; heating or prolonged sunlight exposure can accelerate leaching, though skin absorption of these additives at low concentrations is limited.
Skin sensitization or dermatitis
No documented allergic or irritant reactions to the Band 9 silicone or stainless steel band are on record. Individual sensitivity is rare but possible with any wearable material.
Seal integrity and bacterial/fungal growth
If the waterproof coating or seals degrade, moisture can accumulate under the band, creating an environment for microbial growth. Regular cleaning and replacement of the band when visibly degraded mitigate this risk.
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 Waterproof Smartwatches & Fitness Trackers
Swatch
Chrono 42 Quartz Watch
Stainless steel case, mineral/plastic crystal, standard watch components
Lower concern. Standard watch materials pose minimal PFAS risk.
⚠Brand says nothing about PFAS
Swatch
SEA WASP
Plastic/resin watch case and strap
Typical consumer watch, no known PFAS risk signal identified
⚠Brand says nothing about PFAS
Swatch
Neon Seppia Big Bold Chrono Quartz Watch
Stainless steel case, plastic/resin band, mineral or acrylic crystal
Lower concern. Standard watch materials typically lack intentional PFAS use.
⚠Brand says nothing about PFAS
More waterproof smartwatches & fitness trackers 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.