Sealing strips are classified by material
The rubber material of the automobile sealing strip is three kinds of dense rubber, sponge rubber and hard rubber. Hard rubber has a hardness of up to Shore A95. The sealant is made of anti-aging, low-temperature, moisture-resistant, chemical-resistant, especially ozone-resistant ethylene propylene diene monomer (EPDM). EPDM can be combined with steel strip, steel wire braid, TPE, flannel, flocking, PU coating, silicone coating, etc. to ensure waterproof, dustproof, soundproof, heat insulation, vibration and protection of the interior and exterior of the car. Grinding and decorative effects. In general, EPDM seals can be used stably for more than ten years. Neoprene (CR) with good ozone resistance and good aging resistance can also be selected. Considering the process performance of common rubber compounds, it is sometimes necessary to use a combination of rubber, such as natural rubber (NR) and CR and styrene-butadiene rubber (SBR), or polyethylene (PE), EPDM and NR rubber and plastic. Improve ozone resistance. With the continuous development and maturity of thermoplastic elastomer (TPE) technology, the field of application continues to expand. Among the raw materials for the manufacture of sealing strips, EPDM rubber, the main raw material used in the past, is also constantly being updated and developed. The new EPDM with excellent physical properties and good processing properties can control the long-chain branching of the molecule, which makes it better in vulcanization performance and can increase the extrusion speed and product yield. New thermoplastic elastomers such as TPO and TPV are increasingly used in automotive weather strips. These materials combine the excellent engineering properties of elastomers with the excellent properties of plastics, which are both easy to process and recyclable. These materials are gradually replacing EPDM products.