Antimony oxide is a heavy powder employed in the plastic industry on mixing recipe's as a fire retardent meaning the(pvc) plastic will have a higher ignition temp for combustion. I commonly used antimony oxide at work for many years. But I was allergic to the powder form resulting in skin irritations similar to poisin ivy. Only some people(30- 50%? )are allergic to antimony oxide, and the rash that developes on those skin specimens has been refered to as antimony measles. I have also heard the the production of antimony oxide always has a trace of arsenic compounds. HDN
