Xiaomi · Waterproof Smartphone Cases
Xiaomi Smart Band 9 Pro Smartwatch
No coating described, and no PFAS statement from the brand.
The product information we reviewed describes aluminum alloy case, elastomer strap, with no water-repellent coating named. Water resistance on products like this usually comes from the material and its seals rather than a surface treatment. The brand has published no PFAS statement for it.
We flunk more products than we pass. This one earned its grade. How we grade
Material
Aluminum alloy case, elastomer strap
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Elastomer strap degradation and skin contact
Elastomer straps naturally degrade over 1, 3 years with sweat, UV, and heat exposure. Aged elastomer can occasionally cause contact dermatitis in sensitive individuals, though incidents are uncommon. Xiaomi does not specify elastomer type (silicone vs. other polymers); silicone is preferred but not confirmed here.
Aluminum alloy corrosion in saltwater or high-chlorine environments
Although the device is rated IP68 waterproof, prolonged exposure to saltwater, pool chlorine, or aggressive sweat (high electrolyte content) can pit or corrode the aluminum case if the protective coating is compromised. This is cosmetic and safety-relevant only if the coating fails and metal leaches onto skin, which is rare.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Battery thermal hazard under device malfunction
No recalls or reported incidents of overheating, battery swelling, or thermal runaway for the Xiaomi Band 9 Pro. Sealed device design with embedded lithium battery is standard for smartwatches; risk is low if the device is not physically damaged.
Heavy metals
Smartwatch PCBs and solder may contain lead or cadmium in trace amounts per standard electronics manufacturing. However, the sealed enclosure prevents skin contact and leaching. No public data suggests elevated contamination specific to Xiaomi devices.
Source, FDA ↗Off-gassing or VOC emissions from internal adhesives
Adhesives and potting compounds inside sealed wearables are not in direct contact with skin or breathable air, minimizing inhalation risk. No off-gassing incidents reported for Xiaomi smartbands.
The full breakdown
What it's made of and why it matters
The Xiaomi Smart Band 9 Pro uses an aluminum alloy case paired with an elastomer (rubber/silicone) strap. Aluminum alloy in consumer wearables is generally inert when anodized or powder-coated, which prevents corrosion and leaching into skin contact surfaces. The elastomer strap is the primary material touching skin; if it is silicone-based (typical for Xiaomi bands), it carries minimal chemical leaching risk under normal wear. No decorative glazes, enamel coatings, or ceramic components are involved.
The brand's record and disclosure
Xiaomi does not publicly disclose detailed material safety data, PFAS statements, or third-party certifications for wearables. The brand has no established history of chemical hazard recalls for smartbands or smartwatches. Given the product's sealed electronics design and lack of complex coatings, full transparency on material sourcing is less critical than for cookware or textiles, though transparency gaps remain typical across the smartwatch industry.
How it compares in its category
Smartwatches (wearable electronics) differ fundamentally from waterproof smartphone cases in material risk profile. This device is a sealed wearable with metal and elastomer surfaces, not a case. Compared to typical smartwatch competitors (Apple Watch, Samsung Galaxy Watch), the Xiaomi Band 9 Pro offers similar material simplicity, the elastomer band is not a material linked to PFAS-based flame retardants, and aluminum has a lower concern profile than certain polymer housings that may require flame retardant additives. Elastomer straps across brands generally pose lower chemical risk than textile or leather alternatives.
If you buy it
Rinse the elastomer strap periodically with mild soap and water to remove sweat and skin oils, which can degrade elastomer over time. Store away from direct heat sources and extreme cold, as elastomer can become brittle or sticky in temperature extremes. If the strap shows visible cracking, tearing, or discoloration after 1, 2 years, consider replacement to avoid skin irritation from aged material fragments. Avoid leaving the device in sealed hot environments (car dashboards, direct sunlight in bags) for extended periods, as internal battery management is more sensitive than surface materials.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Xiaomi has made none
Formulations change between production runs, so check the current label. How we grade.
More waterproof smartphone cases 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.