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Its low weight and high impact resistance have made polycarbonate the dominant material for automotive headlamp lenses. However, automotive headlamps require outer surface coatings because of its low scratch resistance and susceptibility to ultraviolet degradation (yellowing).
Headlight restoration or plastic headlight restoration is the act of restoring aged headlight lenses that have become discolored or dull due the original factory UV protective coating degrading primarily due to UV light and other environmental factors such as road debris impact (stones, sand, etc.) rain, and exposure to caustic chemicals.
Headlamp aim must be properly checked and adjusted frequently, for misaimed lamps are dangerous and ineffective. [54] Over time, the headlamp lens can deteriorate. It can become pitted due to abrasion of road sand and pebbles and can crack, admitting water into the headlamp. "Plastic" (polycarbonate) lenses can become cloudy and discoloured ...
They also produces polycarbonate compounds and blends primarily used in automotive applications, medical devices and LED lighting. [44] The company's LGF polypropylene resin was instrumental in Ford Motor Company's development of an innovative headlamp bracket, which was awarded a 2012 Society of Plastics Engineers Innovation for Safety Award.
Polycarbonates do not have a unique resin identification code. Items made from polycarbonate can contain the precursor monomer bisphenol A (BPA). Susceptible to UV light, exposure results in yellowing (degradation is especially visible in headlamps that lost or didn't have proper protective coating).
Several key mistakes could throw off the accuracy of blood pressure readings for people who take them at home. The average "normal" blood pressure is 120/80, according to the American Heart ...