The optional materials of through-hole rubber parts include natural rubber, neoprene rubber, silicone rubber and EPDM rubber, etc., but EPDM rubber is the most widely used because EPDM rubber has the following characteristics compared with other types of rubber. characteristic.
● In terms of cost: EPDM can be filled with oil and carbon black in a large amount, with a low density (0.865), and the price of the product is lower than that of neoprene and silicone rubber.
● In terms of performance: EPDM rubber has outstanding ozone resistance and excellent aging resistance; it has stable effects on water, ethanol, acetone, sulfuric acid, 20% hypochlorous acid and lye, and has good elasticity. 2 points are more important for the frame parts and the rubber parts connecting the inside and outside of the body. In addition, natural rubber has excellent physical and mechanical properties, but has poor oil and solvent resistance, low temperature resistance, and the operating temperature is generally lower than 100 °C; silicone rubber is currently the best cold-resistant and high-temperature resistant rubber, but its mechanical strength is low. Oil and solvent resistance properties are poor; the physical and mechanical properties of neoprene rubber are not inferior to natural rubber, but the cold resistance is poor, and the electrical insulation properties are not good. In contrast, the comprehensive effect of using EPDM rubber is more ideal.