The rubber material of automobile sealing strip has three kinds of dense glue, sponge gum and hard rubber. Hardness of hard rubber can reach Shaw A95. Sealing strip of the rubber material more use anti-aging, low-temperature resistance, water vapor, chemical corrosion resistance, especially ozone aging EPDM (EPDM). EPDM can be combined with steel belt, steel wire braid, TPE, flannel, flocking, PU coating, silicone coating, etc. to ensure the interior and exterior and its own waterproof, dustproof, sound insulation, heat insulation, vibration reduction, anti-wear and decorative role. In general, the EPDM seal can be used stably for more than 10 years. Can also choose to have good ozone resistance and good anti-aging performance of Neoprene (CR). Taking into account the process properties of commonly used rubber, sometimes it is also necessary to use rubber, such as natural rubber (NR) and CR and SBR (SBR) Three kinds of rubber, or polyethylene (PE), EPDM and NR rubber and plastic to improve the ozone-resistance. With the continuous development and maturation of thermoplastic elastomer (TPE) technology, the application field is expanding. In the manufacture of raw materials for sealing strip, the main raw materials used in the past EPDM rubber is also constantly updated and developed. With excellent physical properties and good processability, the new EPDM can control the long chain support of the molecule, which makes the vulcanization performance better, and can increase the extrusion speed and product output. New thermoplastic elastomers, such as TPO and TPV, have been used more and more in automotive sealing strips. These materials not only have excellent engineering properties of elastomers, but also have excellent properties of plastics, which are convenient for processing and reusable, which are replacing EPDM products gradually.
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