What material is the lower trim of the rear bumper of a car made of
The material of the lower trim plate (deflector plate) of the rear bumper of a car is mainly polyester and polypropylene plastics , and some high-end models will use polyester-based plastics.
Material characteristics
Youdaoplaceholder0 polyester-based plastic : It has high strength and good impact resistance, and is often used for the outer panels of car bumpers.
Youdaoplaceholder0 polypropylene series plastics : light in weight and low in cost, they are widely used in the bumpers of ordinary cars.
Youdaoplaceholder0 polycarbon-based plastics : higher strength, weldable, suitable for scenarios with higher strength requirements.
Special material
Some models (such as Pajero Sport) use ABS engineering plastic , which has more outstanding heat resistance and impact resistance.
Material selection
Modern car designs tend to be lightweight, with plastic bumpers accounting for over 90%. However, some car owners will switch to manganese steel, stainless steel or aluminum alloy materials to enhance protection.
The plastic plate under the rear bumper of a car (the rear bumper lower trim) is usually called a deflector , and its core functions are as follows:
Aerodynamic optimization
The deflector plate, through its unique design, guides the orderly flow of air under the vehicle, which can significantly reduce the lift generated during high-speed driving, prevent the rear wheels from floating, enhance driving stability and reduce wind resistance, and indirectly improve fuel economy.
Protection and Safety
During a collision, the deflector can absorb and disperse the impact force, reducing damage to the vehicle body and pedestrians. For instance, in the event of a high-speed impact, it can reduce the harm of the impact force to the driver and passengers.
Appearance beautification
Its styling design is often in harmony with the overall style of the vehicle, enhancing the visual dynamism and fashion sense, and improving the vehicle's recognition.
Structural reinforcement
Some of the deflector plates are made of high-strength plastic, which can enhance the impact resistance of the rear bumper and act as a buffer in minor collisions.
The repair method for the damaged rear bumper lower trim of a car depends on the extent of the damage:
Repair of minor cracks
Youdaoplaceholder0 Clean the damaged area : Wash with soapy water to ensure there are no impurities on the surface.
Youdaoplaceholder0 Paste new trim panels : Select plastic panels of the same color and texture as the original vehicle, apply glue to the back and stick them to the damaged area. Make sure the glue is completely dry before driving.
Youdaoplaceholder0 Edge treatment : If the edge is sharp, it can be sanded smooth with sandpaper and then glue can be applied to enhance the strength.
Treatment of severe damage
Youdaoplaceholder0 assessment and replacement : If cracks cause the plastic plate to be unable to restore its original cushioning function (such as fragments falling off and being irreparable), it is recommended to replace the entire rear bumper lower guard plate or rear bumper.
Youdaoplaceholder0 Professional repair : It should be handled at a 4S store or a professional auto repair shop to avoid color difference issues.
Precautions
Self-repair may cause color differences. It is recommended to give priority to professional maintenance.
If metal parts (such as stainless steel guard plates) are involved, attention should be paid to the matching of screw hole positions and installation strength.
The lower trim panel of the rear bumper of a car (usually referring to the plastic guard plate below the bumper) has fallen off. The main impacts are as follows:
Aerodynamic performance
If it is a spoiler (commonly found under the bumper), its damage may lead to increased wind resistance during high-speed driving, affecting fuel economy and driving stability.
Chassis protection
If the guard plate falls off, it will lose its protective function for the chassis components. Road debris (such as stones and branches) may come into direct contact with the engine or chassis, increasing the risk of component damage.
Noise and abnormal sounds
The absence of a guard plate may lead to increased noise in the engine compartment, affecting driving comfort.
Sediment accumulation
The fallen guard plate cannot prevent mud and sand from entering the chassis, which may cause rust on the internal components.
Appearance and Maintenance
Damaged guard plates may affect the vehicle's appearance, but they are usually located at the bottom and not easily noticeable.
It is recommended to repair or replace in a timely manner to protect the chassis components and maintain vehicle performance.
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