Strontium sulfide a possible health hazard when released as gas
Among various toxic substances reportedly present in some Chinese drywall, is a phosphor known as strontium sulfide. Sometimes used as an additive in firework displays, it produces a bright red flame when ignited. The chemical is specifically required to be labeled by the U.S. Department of Transportation as hazardous when shipped in packages, trucks, or railroads due to its potential risk. Strontium sulfide reacts with acids, and releases a gas which may lead to skin irritation. More disturbingly, the compound possesses an explosion risk and fire hazard.