Natural rubber sheets are mainly used in substations, power plants, and other places. They are mainly made of rubber insulation materials and should have no harmful irregularities such as small holes, cracks, etc. There are various specifications based on voltage level, color, and thickness, such as 5kV, 10kV, 20kV, etc. The colors include black, red, and green, and the thickness ranges from 2mm to 12mm. When storing, it should be placed in a dry and ventilated place, away from heat sources and acid and alkali, and kept dry.