Specimen No. 0159
CautionMineralheavy metalmaterial
Antimony Trioxide (Polyester Catalyst)
antimony trioxide · sb2o3 · antimony(iii) oxide
A catalyst used in the manufacturing of polyester fibers. Classified as a possible human carcinogen (IARC Group 2B) in inhaled form. Found in 80–85% of virgin polyester; studies show 0.05–2% can be mobilized into artificial sweat during wear — raising concern for prolonged skin contact with synthetic activewear.
medium confidence
Researched April 18, 2026Specimen 0159Antimony Trioxide (Polyester Catalyst)
Concerns
- IARC Group 2B possible carcinogen (occupational inhalation)
- Leaches from polyester fabric under sweat conditions — dermal exposure concern
- Accumulates in aquatic organisms during textile washing
- Occupational exposure limits exist for workers in PET manufacturing
Regulatory flags
- ⚑IARC Group 2B possible carcinogen
- ⚑EU restricts in textiles — max 30 mg/kg in fabrics in skin contact
Commonly found in
Polyester clothingActivewearSynthetic underwearFleeceAthletic wear
Sources & references
Last researched: April 18, 2026
Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.
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