Tissot · Waterproof Sports Watches
Tissot Men's PRX Watch
Lower PFAS concern, traditional watch metals pose minimal risk, but brand transparency is absent.
The Tissot PRX is a mechanical watch made primarily of stainless steel and sapphire crystal, materials not known to require PFAS coatings. Tissot (Swatch Group) makes no public PFAS disclosures or claims.
Shop Tissot on Amazon →Material
Stainless steel case, sapphire crystal, standard watch components
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 PRX case is 316L stainless steel, a corrosion-resistant alloy commonly used in medical implants and marine applications. The crystal is sapphire, a synthetic aluminum oxide that is chemically inert and does not leach. The movement contains standard mechanical watch components (steel, brass, jewels) with no known off-gassing or leaching concerns. Overall material selection reflects low chemical risk for skin contact or ingestion pathways.
The brand's record and disclosure
Tissot (part of Swatch Group) does not publish detailed chemical composition or manufacturing safety certifications for individual watches. The brand has not faced public recalls or controversies tied to material contamination in watches. Transparency on heavy metals, coatings, or supply-chain chemical testing is absent from public documentation. For a luxury sports watch, disclosure lags behind industry best practice but does not indicate known problems.
How it compares in its category
The PRX uses materials (stainless steel, sapphire) that are standard across mid-to-premium waterproof watches and carry no higher risk than competitors like Omega, Tudor, or Seiko. Watches are lower-risk products than cookware or textiles because they have minimal contact with food, skin microabrasion, or heat exposure. The PRX's material choices are conservative and typical for the sports watch segment.
If you buy it
Clean the case and bracelet periodically with mild soap and water to prevent salt or sweat buildup, which can accelerate corrosion of any microscopic defects in the steel finish. Avoid prolonged exposure to extreme heat (above 60°C/140°F), as this can affect lubricants in the movement, though the case itself is stable. If the sapphire crystal cracks, have it replaced by an authorized service center to maintain water resistance. The stainless steel bracelet may show micro-scratching over time; this is cosmetic and does not affect safety.
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 typically contains 8-12% nickel. Individuals with nickel sensitization may experience contact dermatitis from prolonged bracelet wear, particularly if skin is sweaty or scratched. This is a known issue across all steel watches and not specific to the PRX.
Sapphire crystal integrity
Synthetic sapphire does not chemically leach or off-gas. However, a cracked or chipped crystal compromises water resistance and could allow moisture ingress into the movement, risking mold or corrosion inside the case.
Cadmium or lead in plating or coating
No public recalls or testing data suggest heavy metals in the PRX's case finishing or decorative coatings. Modern stainless steel watches rarely use problematic plating; Tissot's manufacturing standards are consistent with industry norms.
Allergenic metals from bracelet links
The stainless steel bracelet may harbor bacteria or skin irritants if not cleaned regularly, particularly in the spaces between links where sweat and debris accumulate. This is a hygiene issue, not a manufacturing defect.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 82% 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.