... .inflammable yellow powder 3.eco-friendly,slight odor, non--toxic Insoluble sulfur (IS series):1.a new rubber vulcanizing agent2.inflammable yellow ... powder 3.eco-friendly,slight odor, non--toxic Brief Introduction:Insoluble sulfur is a new rubber vulcanizing agent. It forms IS-series ... product. We are able to offer all types of superior insoluble sulfur, such as IS-HS8010, IS-HS7520, IS-HS7020, IS- ...