Under the skin: How acoustic glass makes car conversation easier
Back in the day, windscreen glass was made safe for use in cars by subjecting it to a high-temperature process to produce ‘toughened’ or ‘tempered’ glass. The heat treatment puts an end to shards of glass lacerating occupants when it pops, but the inside of the car is showered with small chunks of glass, many of which would remain hidden under carpets and in crevices for the rest of the car’s life.
Acoustic glass is a fancy form of laminated glass but still based on the same principle of laminating two sheets of glass either side of a single, thin sheet of polymer. Noise is controlled in a couple of ways, one by reflecting it back towards the source and the other by absorbing the sound energy within the polymer and glass package. Its use in a car means the side windows and windscreen are fitted with it, giving the added safety and security advantage of laminated glass all round.
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