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(1) a wide range of hardness. And in the high hardness still has a good rubber elasticity and elongation. (2) high strength. Much higher rubber hardness at their tensile strength and tear strength than common rubbers. In plastic hardness, their impact strength and flexural strength is much higher than the plastic. (3) Wear. There are "wearable rubber" the best known. Especially with the presence of water and other moist medium, working conditions, the wear resistance is often several times the ordinary rubber material. Metallic materials such as steel, although hard, but not necessarily wear. Yellow River irrigation area as large pumps, the overcurrent protection components metal mouth ring and ring after a lot of sediment erosion, does not take hundreds of hours on severely worn leakage, and the use of the polyurethane elastomer coating of the mouth ring and continuous protection ring running 1800 hours still wear. (4) shock-absorbing, anti-radiation and anti-permeability. The advantage of this polyurethane elastomer obtained official reason is widely used in the aerospace, water, mining and other fields. But polyurethane elastomers are also inadequate. (1) heat large. High temperature performance in general. Especially good heat resistance properties. Normal temperature requires less than 120 degrees. If long-term work in the high-frequency oscillation condition, must be used where there is sufficient cooling medium. (2) resistant to highly polar solvent and strong acid medium. At a certain temperature, alcohols, acids, ketones cause swelling and degradation of the polyurethane elastomer. Methylene chloride, trichlorethylene at room temperature causes swelling polyurethane elastomer.