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Science Channel
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The interior panels of car doors are attached to the door frames by clips and adhesives and can be removed for maintenance. The panels protect all kinds of wires and motors for such things as power windows and locks. They also provide protection for windows that are rolled down, and are designed to reduce noise from the outside. The panels can vary in appearance from utilitarian plastic to fancier materials. The material used may reflect the consumer's preference for a certain look, or it may accentuate the style of a luxury vehicle. The panels are usually composed of plastic, metal, wood, leather or a combination of those materials. Materials may be chosen for technological or environmental reasons: to enable easy access to the inner electrical parts, to reduce the weight of the car and thus increase fuel efficiency or to comply with governmental regulations (some European countries require that new cars be 85 percent recyclable).
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