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  1. Common rubber has the following basic properties 1) very high elasticity. This is the unique property of rubber. The elongation of rubber can reach 100% to 1000%. Rubber has a great amount of deformation at first under load, but with the increase of external force, rubber has a strong resistance to deformation. Therefore, rubber can be used as damping material for manufacturing various parts to reduce impact and absorb vibration. 2) good thermal plasticity. Rubber loses its elasticity at a certain temperature and has plasticity, which is called thermoplasticity. Rubber is easy to be processed into various shapes and sizes when it is in a thermoplastic state, and the shape and size of the deformation can be maintained when the external force is removed. According to this characteristic, the rubber can be processed into products of different shapes. 3) good adhesion. Adhesion refers to the ability of rubber to bond to other materials without being separated. Rubber has a strong adsorption capacity, and can be bonded to other materials as a whole, such as automotive tires are made of rubber and cotton, wool, nylon, etc., firmly bonded together. 4) good insulation. Most of the rubber is insulators, insulation materials such as wires, cables, and other conductors. In addition, the rubber also has good cold resistance, corrosion resistance and water leakage, gas and other properties. The disadvantages of rubber are poor thermal conductivity, low hardness and tensile strength, especially aging. Rubber aging refers to the change of elasticity, hardness, swelling resistance and insulation of rubber during storage and use, which results in discoloration, viscosity, brittleness and cracking. The main causes of rubber aging are fatigue caused by oxygen, ozone oxidation in the air, light (especially ultraviolet radiation), temperature and mechanical deformation. Therefore, in order to slow down the aging of rubber products and prolong their service life, rubber products should avoid contact with acid, alkali, oil and organic solvents in use and storage, and minimize heat, sunshine and rain.