Anti-sticking agents, sealants and related products play a very important and irreplaceable role in the automotive manufacturing industry. They are widely applied in the powertrain, interior and exterior components, as well as in the three major vehicle manufacturing workshops including the welding, painting and final assembly workshops. They serve functions such as bonding and sealing of components, anti-corrosion of the vehicle body, structural reinforcement, heat insulation and vibration reduction, improvement of riding comfort, and enhancement of the vehicle body's aesthetics.
        Adhesives and sealants used in the automotive industry have their own particularities. On the one hand, they need to meet the requirements of industry-wide general development. In terms of performance, they should meet the quality and service life requirements of automobiles. On the other hand, they must also meet the needs of large-scale and fast-paced production operations in the automotive industry, and should have good construction processability and wide compatibility with process materials.
In addition, many automobile manufacturers have their own standards for adhesive products and process requirements, and there are often customized demands for the use of adhesives.

1. General Performance Requirements
   ① The service life must be consistent with the average expected service life of automobiles (10 to 15 years).
   ② The operating temperature range is from -40°C to 90°C, which can ensure the normal operation of automobiles in both cold and tropical regions. For special components such as brake shoe adhesives, higher temperature resistance requirements are needed (able to withstand short-term high temperatures of 250 to 300°C).
   ③ It must have the properties of resistance to moisture, salt corrosion and various media (such as oil, water, gasoline, diesel, weak acids and alkalis, etc.).
   ④ Most adhesives must have a certain degree of fatigue resistance, always maintain a certain degree of elasticity and extensibility, have good anti-aging properties, and be able to withstand various stresses and vibrations generated during the operation of the automobile, and the bonded and sealed parts are not easily damaged.
   ⑤ In some bonding cases, such as the bonding of fiber plastic products, the solvent components of the adhesive will not cause the migration of plasticizers, resulting in discoloration or deformation of the fiber products or plastic decorative parts.
   ⑥ For structural adhesives used to bond automotive components, their bonding strength can ensure the reliability of the bonding and the absolute safety during the operation of the automobile.
   ⑦ According to different application fields, adhesives must meet the environmental protection and performance requirements specified by the state, the industry and automobile manufacturers.
   
   
2. Usage Requirements on the Production Line
   ① According to the requirements of the usage points on the production line, corresponding construction methods such as brushing, spraying, dipping or extrusion can be adopted.
   ② The adhesive must be adapted to the time rhythm of the production line, with a moderate gel time, and be able to ensure sufficient initial bonding strength or a certain instantaneous bonding effect.
   ③ If the adhesive needs to be cured by heating, the temperature control needs to take into account the temperature tolerance of other materials at the same time.
   ④ It has a certain tolerance for the surface treatment of bonded parts, such as cleanliness. The existence of a small amount of oil stains or slight surface defects will not have a significant impact on its bonding strength.
   ⑤ The adhesive used in the spot welding station cannot affect the welding strength. The adhesive used in the welding workshop must be able to withstand the subsequent processes of cleaning, phosphating and electrocoating, and at the same time, it cannot affect the quality of the phosphating solution and the electrocoating paint.
   ⑥ The safety of the used adhesive needs to be considered, and it should have no harmful effects on the users and the environment.
   ⑦ In the fields where manual fitting is required, it has a certain tolerance for the proficiency of workers, and basically ensures that there is no significant quality difference between the products made by skilled workers and novices.
   ⑧ The storage period should generally be at least half a year.
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