With outstanding aging resistance, antioxidant performance is more than 10 times higher than that of unsaturated rubber, such as natural rubber. It can be exposed to sunlight and air for a long time and is not easy to oxidize. It is resistant to low temperature -40 and high temperature 120.has the best air tightness and watertightness. Its air permeability is about 1/20 of natural rubber. It has excellent acid and alkali resistance and excellent insulation performance, it is a special product used in underground waterproofing works.A environment-friendly product, no pollution, no flammable, especially suitable for colored steel tiles, color steel sheet waterproof and other metal roofing waterproof, old roof maintenance, the original waterproof layer need not be dismantledone of the best waterproof materials at present, and it has been used for over 10 years.