Black Rubber which has several advantages over natural rubber, for example in its resistance to work at high temperatures up to 200F without failure or physical damage to the neoprene rubber product. The disadvantage is that when working under a temperature of 40F, this neoprene rubber product will experience failure or damage usually becomes stiff or hardens. Black Rubber which is resistant to oil, temperature or weather, is resistant to water immersion, solvents or solvents, Harijaya Insulation Surabaya Selling Karet Neoprene is used as a raw material for rubber coatings in the lining process to resist corrosion caused by certain chemicals such as oil, oil, solvents or solvents or by water immersion.