Tissot · Waterproof Sports Watches
Tissot Seastar 1000 Quartz GMT PRX POWERMATIC 80
Lower PFAS concern for the watch itself; strap material warrants caution if synthetic rubber source unknown.
The Tissot Seastar 1000 is primarily stainless steel and sapphire crystal, inherently lower-PFAS materials. The synthetic rubber strap is a potential exposure point, as some rubber compounds contain PFAS, but Tissot discloses nothing about PFAS or water-repellent coating treatments on this model.
Shop Tissot on Amazon →Material
Stainless steel case, sapphire crystal, synthetic rubber strap
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
other is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Uncoated safe material
Bare, uncoated material (cast iron, stainless, carbon steel, or glass) with no surface treatment to contain PFAS.
The full breakdown
What it's made of and why it matters
The Seastar 1000 PRX case is stainless steel (typically 316L), which is corrosion-resistant and does not leach nickel or other metals into skin or food under normal wear. The sapphire crystal is synthetic (lab-grown aluminum oxide), chemically inert and free of lead or cadmium. The synthetic rubber strap is the variable: composition depends on the supplier and manufacturing process, which Tissot does not publicly disclose in detail, making sourcing of plasticizers and vulcanization agents impossible to verify from available information.
The brand's record and disclosure
Tissot (Swatch Group subsidiary) does not publish detailed material safety disclosures or PFAS reduction commitments on this model. No product-specific recalls or safety violations are on public record for the Seastar 1000 PRX. The brand maintains ISO certifications for water resistance and watch manufacturing but does not highlight consumer chemical testing results. Transparency on strap material sourcing is limited, typical of the luxury watch industry.
How it compares in its category
Sports watches in this price tier (EUR 600-1000) rarely disclose strap chemistry; most competitors use similar stainless steel cases and synthetic rubber. Watches with metal bracelets eliminate strap leachable risk entirely but are more expensive and less sporty. Fabric nato-style straps or certified hypoallergenic rubber would represent a safer alternative if chemical transparency is a priority. Tissot's positioning is mainstream for materials without differentiation on chemical safety.
If you buy it
Rinse the strap with cool water after prolonged saltwater or sweat exposure to reduce skin irritation from accumulated salts and potential trace contaminants. Avoid prolonged heat exposure above 60 degrees Celsius to minimize any volatile release from the synthetic rubber. Replace the strap every 3-5 years of heavy wear, as elastomers degrade over time and may shed microparticles. Clean under the strap monthly if worn daily to prevent bacterial growth in the rubber-skin interface.
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.”
Nickel leaching from stainless steel
316L stainless steel used in watch cases is high-nickel-resistant. No recalls or reported skin sensitization linked to this model are on public record. People with severe nickel allergy should patch-test any watch before extended wear.
Synthetic rubber strap degradation and microplastic shedding
Synthetic rubber compositions (likely nitrile or neoprene blend) are not disclosed by Tissot. Over 3-5 years of heavy use, elastomers can crack and shed microparticles; no accelerated testing data for this specific strap is available. Replacement is the standard mitigation.
Plasticizer or vulcanization chemical skin contact
Synthetic rubber straps may contain residual phthalates, bisphenols, or sulfur-based vulcanization agents depending on supplier and curing process. Tissot provides no material safety data sheets for the strap. Sweat and heat can facilitate migration of trace compounds, though at levels unlikely to cause acute toxicity in normal wear.
Sapphire crystal safety (low risk)
Synthetic sapphire is chemically stable and contains no lead, cadmium, or toxic coatings. No hazard is identified for this component.
Water filter or internal sealing compound leachables
The watch uses mechanical seals and gaskets (typically elastomeric) rated to 1000m. No public data on gasket material composition or leachables are available, but internal contact with wrist skin is minimal and risk is theoretical.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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.
More waterproof sports watches 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.