Common materials for automotive exterior plastic parts include PP (polypropylene), PC/ABS alloy, ASA (acrylonitrile-styrene-propylene rubber), PBT, PC (polycarbonate), and TPO (thermoplastic polyolefin). These materials are widely used in various components due to their excellent properties.
1. PP (Polypropylene)
Applications: Bumper skins, mudguards, wheel covers
Characteristics: Low density, lightweight, chemically resistant, low cost. Often modified (e.g., PP/EPDM) to improve impact resistance and weather resistance.
Advantages: Contributes to overall vehicle weight reduction, significantly improving fuel economy.
2. PC/ABS Alloy
Applications: Bumpers, grilles, rearview mirror housings, taillight covers
Characteristics: Combines the high impact resistance of PC with the easy processing of ABS, possessing good rigidity, heat resistance, and surface gloss.
Advantages: Suitable for spray painting and electroplating, widely used in exterior parts of mid-to-high-end vehicles.
3. ASA (Acrylonitrile-Styrene-Acrylic Rubber)
Applications: Rearview mirror housings, roof racks, outdoor exposed parts
Characteristics: Strong resistance to UV aging; does not discolor or chalk after long-term sun exposure.
Advantages: Superior weather resistance compared to ABS, ideal for outdoor parts requiring high durability.
4. PBT (Polybutylene Terephthalate)
Applications: Bumpers, spoilers, ignition housings
Characteristics: High strength, heat resistance, dimensional stability; glass fiber reinforcement (PBT+GF) can be added to improve mechanical properties.
Advantages: Suitable for structural parts in high-temperature environments.
