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Plastics for automobile parts

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Plastic is a kind of macromolecule material which is produced by complex chemical reactions such as polymerization, resin bonding, resin addition, condensation and so on. Properties: It is a light material (1/8 of steel), high specific strength, good chemical stability, corrosion resistance, good insulation, wear resistance, sound absorption, easy processing and molding.

The main applications are:

Installations: dashboard and gasket, sundries box, steering wheel, joystick, interior trim panel, seat armrest, door lining, various filling materials, etc.

External fittings: sealing strip, bumper panel, fender, skirt edge, trim strip, hose, shock absorber gasket, handle, etc.

Others: air filter housing, fan blades, various sensors, electrical appliances, and some gear.

With the continuous improvement of advanced engineering plastics in performance, it is being developed and applied in automobile engine cover, roof, luggage rack and other parts.

Plastics are divided into thermoplastics and thermosets.

Thermoplastic softens after heating, has plasticity, machinability, and hardens after cooling; if it softens after reheating, hardens after cooling. This process can be repeated and has no effect on its structural properties. For example, polyfluoroethylene, polystyrene, polyamide (also known as nylon) and so on, they have simple molding process, high production efficiency, certain mechanical properties, but low heat resistance and rigidity. Thermoplastics are most widely used in automobiles. Commonly used are: ABS (acrylonitrile butadiene styrene), PP (polypropylene), PE (polyethylene) and so on.

Thermosetting plastics react chemically when heated and harden after solidification; they cannot be softened by reheating. Such as phenolic resin, epoxy resin and so on. They are highly heat-resistant, pressure resistant and difficult to deform, and are relatively inexpensive, but the molding process is complex and the production efficiency is low.


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