... ,slight odor, non--toxic Insoluble sulfur (IS series):1.a new rubber vulcanizing agent2.inflammable yellow powder ... --toxic Brief Introduction:Insoluble sulfur is a new rubber vulcanizing agent. It forms IS-series oil - treated and non ... types of superior insoluble sulfur, such as IS-HS8010, IS-HS7520, IS-HS7020, IS-HS6033; IS60, IS90 and so on ... materials. The quality guarantee time is half a year.