Vulcanization is a chemical process in which the rubber is heated with sulphur, accelerator and activator at 140–160°C. This improves elasticity, resilience, tensile strength, viscosity, hardness and weather resistance in rubber. The best chemicals used are Deovulc EG 3, Deovulc 7P4 75V, Deovulc BG 187V etc. The products are REACH and ROHS compliant.