The rubber material of the automobile seal strip has three kinds: dense glue, sponge rubber and hard rubber.
The hardness of the hard rubber can reach the Shaw A95. The rubber of the sealing strip is more resistant to aging, low temperature, water resistance and chemical corrosion, especially three EPDM, which is resistant to ozone aging. EPDM can be combined with steel belt, wire braided belt, TPE, flannelette, flocking, PU coating, and silicone coating to ensure the indoor and outdoor and its own waterproof, dustproof, sound insulation, insulation, vibration damping, anti-wear and decoration.
In general, EPDM seals can be used for more than ten years. CR can also be selected with good ozone resistance and good aging resistance. In view of the technical properties of common adhesives, it is sometimes necessary to choose and use three rubber, such as natural rubber (NR) and CR and styrene butadiene rubber (SBR), and to improve the ozone resistance by using or polyethylene (PE), EPDM and NR rubber.
With the development and maturity of thermoplastic elastomer (TPE) technology, applications are expanding. In manufacturing raw materials for sealing strips, the main raw materials used in the past three yuan ethylene propylene rubber are also constantly updated and developed.
A new type of EPDM with good physical properties and good processability can control long chain branching in the molecule, make its vulcanization performance better, and improve the extrusion speed and the production of the product. New types of thermoplastic elastomers, such as TPO and TPV, are used more and more in automotive seals. These materials not only have excellent engineering properties of elastic bodies, but also have excellent properties of plastics. They are both convenient for processing and recyclable. These materials are gradually replacing EPDM products.
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