Determining the material type of plastic parts in automotive exteriors can be achieved through a comprehensive approach, including observing the appearance and texture, understanding the vehicle's positioning, combining component function with professional testing methods. Different materials exhibit significant differences in gloss, weight, sound, and texture.
Preliminary Judgment Through Sensory Observation
Steel/Metal: Smooth and flat surface with a distinct metallic luster; produces a crisp, resonant sound when tapped; feels heavy.
Aluminum Alloy: Bright and soft luster; fine texture; relatively lightweight; produces a duller sound when tapped than steel.
Carbon Fiber: Features a unique woven texture with a regularly interwoven structure; hard yet lightweight; a typical hallmark of high-performance vehicles.
Reinforced Plastics (e.g., ABS, PP, PC):
ABS Resin: Commonly used in bumpers and body panels; has a good surface gloss, moderate hardness, and strong impact resistance.
Polycarbonate (PC): Primarily used in lights and windows; high transparency; strong impact resistance; not easily broken.
Polypropylene (PP): Commonly used in interior parts, it has a soft feel and good heat resistance, but its weather resistance is relatively low.
Analysis based on vehicle positioning and component usage:
Ordinary family cars: Mostly use low-carbon steel plates + ABS/PP plastic, with controllable costs, meeting daily usage needs.
Mid-to-high-end models (e.g., Audi, NIO): Components such as the front grille and fenders may use aluminum alloy or PC/ABS alloy, balancing lightweight and corrosion resistance.
New energy intelligent vehicles: Illuminated grilles and intelligent front-end modules often use high-transmittance materials such as M-PMMA and PC, supporting lighting interaction functions.
Rugged SUVs (e.g., Hummer H2): Impact-prone areas such as the hood use reinforced plastics to improve scratch resistance and impact resistance.
