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ISO 7010 safe condition sign indicating the location of an emergency hammer. An emergency hammer is a type of glass breaker shaped like a hammer. Emergency hammers are also known under various names, such as bus mallets, dotty hammers, safety mallets, and bus hammers. Many are attached to a cable or an alarm device to deter theft or vandalism.
Automobile windshield with "spider web" cracking typical of laminated safety glass. Laminated glass is a type of safety glass consisting of two or more layers of glass with one or more thin polymer interlayers between them which prevent the glass from breaking into large sharp pieces. [1]
They require adhesive to bond the glass with the vehicle frame. US Federal Motor Vehicle Safety Standard 212/208 ensures reliability of adhesives used in US vehicles. For a bonded glass, replacement can take up to an hour. Time must be allowed to allow the adhesive to cure. This is known as "Safe Drive Away Time" or "Minimum Drive Away Time".
Safety glass is glass with additional safety features that make it less likely to break, or less likely to pose a threat when broken. Common designs include toughened glass (also known as tempered glass), laminated glass , and wire mesh glass (also known as wired glass).
The windscreen or windshield is instead made of laminated glass, which will not shatter into pieces when broken while side windows and the rear windshield have historically been made of tempered glass. Some newer luxury vehicles have laminated side windows to meet occupant retention regulations, anti-theft purposes, or sound-deadening purposes.
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Polyvinyl butyral (or PVB) is a resin mostly used for applications that require strong binding, optical clarity, adhesion to many surfaces, toughness and flexibility. It is prepared from polyvinyl alcohol by reaction with butyraldehyde.
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