Car exterior rearview mirrors are generally fixed at the front of the car door, and are 3C parts subject to national compulsory inspection, which expand the driver's field of vision and ensure driving safety. It mainly includes support, mirror housing, base plate, connector, lens, heating sheet, lens adjustment module, turn signal, etc.
Since the rearview mirror is installed outside the car, it is exposed to the sun and rain for a long time, and the weather conditions are harsh, and the car is subject to bumps and shocks during driving. Therefore, the material selection of the rearview mirror should take into account temperature, humidity, strength, impact and bending properties, etc. At the same time, the material is not easy to age, corrosion resistance, injection molding performance and painting performance are good, etc.
1. Selection principle of automobile rearview mirror material
The exterior rearview mirror is generally treated by spraying, and its material has the following requirements:
Good heat resistance and corrosion resistance: prevent deformation, aging, corrosion damage, etc. under high temperature exposure;
Good paint adhesion ability: ensure that the paint cannot fall off or change color;
Good fluidity: meet the requirements of injection molding process;
Good processing performance: it is convenient for injection mold design.
2. Commonly used materials for car rearview mirrors
The commonly used material for rearview mirror housing and base is ASA. In addition, modified PP can also be used as an important material for exterior rearview mirrors.
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