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December 2018 Regulatory Update

US NTP Publishes Final RoC Monograph on Antimony Trioxide


On October 19, 2018, the National Toxicology Program (NTP) under the US Department of Health and Human Services published a Final Report on Carcinogens (RoC) Monograph on Antimony Trioxide. The monograph concludes that antimony trioxide is a potential public health concern.

Antimony Trioxide is the most commercially significant form of antimony and is primarily used as a synergist for halogenated flame retardants in plastics, rubber and textiles, which are used in a wide variety of consumer products. It is also used in polyethylene terephthalate (PET) plastics, in glass and ceramic products additives and as a catalyst in the chemical industry. People may be exposed to antimony trioxide in the workplace, in consumer products, or by breathing contaminated air. NTP conducted a cancer hazard assessment of antimony trioxide for possible listing in the RoC which is a document mandated by the US Congress to provide information on cancer hazards for people residing in the United States. The NTP concluded antimony trioxide to be reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies with experimental animals and supporting evidence from mechanistic studies.


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