Automotive sealant strip is one of the important parts of the car. It is widely used in doors, windows, body, seats, sunroofs, engine compartments and trunks. It can also produce rubber hinges for installing passenger luggage compartment doors. It has other functions such as waterproofing and sealing. Classification of automotive sealing strips: 1. Vulcanized rubber sealing strips are generally made of EPDM. Excellent comprehensive performance, outstanding ozone resistance, excellent weather resistance, good high temperature resistance, low temperature performance, outstanding chemical resistance, resistance to various polar solutes, and relatively low density. The disadvantage is that it has a large amount of expansion in general mineral oils and lubricating oils, generally dark products. The operating temperature range is -60 to +150 °C. With its wide application range and excellent comprehensive performance, it has been recognized by domestic and foreign industry companies. 2. Silicone rubber sealing strip has outstanding high and low temperature resistance, ozone and weather resistance; excellent hydrophobicity and proper gas permeability; unmatched insulation performance; hygienic level that meets food hygiene requirements. Meet the requirements of various colors. The disadvantage is that the mechanical strength is the worst in rubber materials and is not resistant to oil. The operating temperature range is -100 to +300 °C. It can be applied to high temperature, cold, strong ultraviolet radiation areas and medium and high-rise buildings. 3. Neoprene sealant strip (CR) Compared with other special rubbers, the individual performance is poor, but the overall performance balance is good. It has excellent weather resistance, ozone resistance, heat aging resistance and oil and solvent resistance, good chemical resistance, excellent flame resistance and good adhesion. The storage stability is poor, hardening occurs during storage, and cold resistance is not good. The relative density is large. Generally it is a black product. Used in environments with oil, heat and acid and alkali resistance requirements. The operating temperature range is -30 to +120 °C. 4, nitrile rubber seals The main features are oil and solvent resistant, but not resistant to ketones, esters and chlorinated hydrocarbons, etc., elastic and mechanical properties are very good. The disadvantage is that it is easy to age and crack in ozone and oxidation, and has poor cold resistance and low temperature resistance. 5. Thermoplastic elastomer type sealing strip has good elasticity and excellent wear resistance, good oil resistance, wide adjustable hardness range (Shore A hardness 65-80 degrees), mechanical properties (tensile strength, Excellent elongation at break, excellent cold resistance and chemical resistance to interwoven corrosion, and the price of raw materials is high. It is a material that can be recycled. The operating temperature range is -60 to +80 °C. It is suitable for areas with strong vibrations such as earthquake-prone areas, railways or factories with high-powered cranes, and areas with strong ultraviolet radiation. 6. Thermoplastic vulcanizate (TPV) Sealant strip It has the flexibility and elasticity of rubber. It can be produced by plastic processing method without vulcanization. The waste can be recycled and reused. It is a material with a wide performance range. It has good heat resistance and cold resistance, low relative density, oil resistance and solvent resistance, similar to neoprene, and resistance to compression set and wear resistance. The operating temperature range is -40 to +150 °C. Suitable for cold, medium and high-rise buildings. 7. Plasticized polyvinyl chloride (PPVC) sealing strip material is cheap and easy to obtain. It has corrosion resistance, wear resistance, acid and alkali resistance and various chemical media. It is resistant to combustion and has high mechanical strength. The disadvantage is that it is easy to match plasticizer in the system. Migration, hardening and brittle over time, loss of elasticity, aging resistance, poor weatherability and low temperature performance. Generally dark products. It is suitable for occasions where the illumination is not strong, the temperature does not change much, and the weather conditions are not bad. 8. Surface coating material The surface of the sealing strip is coated with polyurethane, silicone, polytetrafluoroethylene and other materials to replace the surface flocking of the traditional process. The coated sealing strip has good wear resistance and smoothness, especially the sealing strip after coating the silicone surface coating, and the surface friction coefficient is small, which is beneficial to the sliding of the door and window sash. Suitable for doors and windows with sliding doors and window sashes. It is an alternative to traditional siliconized tops. Daily maintenance and use of automotive sealant strips: 1. Check the seals for large cracks and cracks. If the seal is broken, it can be repaired with an adhesive. In particular, it is easy to fill a large crack strip by using a special adhesive for the seal. Of course, if the seal is seriously damaged or has a large degree of aging, it is best to replace it with a new one. 2. After the car owner uses the car detergent to clean the door and window sealing strip, it is better to apply a layer of high permeability protective agent, which can prevent the sealing strip from aging and greatly improve the sealing of the sealing strip. In addition to this, the gap between the seal strips is easily filled with dust and rust. To this end, the dust should be removed with a brush. 3. When replacing the whole body, a layer of sealant should be applied on the overlapping part of the weld. The thickness of the glue layer should be about 1mm, and the glue layer should not have defects such as false stickiness and air bubbles. The entire lower surface of the floor and the lower surface of the front wheel cover should be coated with an elastic coating of 3mm-4mm and an anti-corrosion coating. These measures not only greatly enhance the sealing performance of the vehicle and slow down the rust rate of the vehicle body, but also greatly improve the ride comfort. 4. The sealing of the door and the body is a relatively difficult part. The sealing requirements are relatively strict. The part to be sealed is relatively long, the sectional shape of each sealing part is not the same, and the door is frequently opened and closed. In the limousine, three lanes, four seals, and a four-seal structure for the front pillar and the roof side beam are installed. This multi-channel seal is generally arranged in the front door seam, in addition to the sealing function, there is also the effect of car noise reduction. 5. After the window glass is damaged, the owner should check the seal for damage when changing the glass. Since the window often fails to return to its original shape after repair, it is necessary to pay attention to the sealing around the window glass in addition to ensuring that the window glass can be easily pulled or lifted. If the gap between the glass and the glass slot is not uniform, the rubber strip is in poor contact with the glass and the glass groove, and the owner can easily pull the seal off by hand. 6. When changing the roof of the car, the owner should first apply a layer of conductive sealant at the press-fit around the roof. After welding, apply the folded edge glue in the flow tank and the joint. This will not only help the body. The seal prevents the car from causing early corrosion due to water accumulation at the flanging weld. 7. The car sunroof is the basic configuration of most family cars. When the sunroof of the car is opened, the rubber seal rail is exposed to the air, which inevitably accumulates dust and even runs into small gravel. Prolonged use may cause the sunroof to deform due to wear and block the drain hole. Therefore, it is important to clean the track regularly and apply lubricant to the track. Although the car seal strip is a small part in the body, it can ensure that the door of the switch is stable and heavy, and it can also protect the car from wind and rain, dust, heat and sound, and decorate the edge of the door and window. When subjected to vibration and distortion, the sealing strip also acts to cushion, absorb shock and protect the glass. Therefore, car maintenance is no small matter, and no link can be ignored.