Vehicle glass other than windshield shatter on impact and hence need replacement. On the other hand, any impact that is more than 3 inches need replacing the windscreen. For most of the vehicle body glass i.e. Door Glass, Vent Glass are non bonded and doesn't require adhesive for installation. But windscreen, sunroof and rear window glass are generally bonded in most of the cars. They require adhesive to bond the glass with car frame. US Federal Motor Vehicle Safety Standard 212/208 ensures reliability of adhesives used in vehicle across US. For a bonded glass replacement can take up to an hour. One of the important thing that ensure a safe installation is the time require for the adhesive to cure. This is known as Safe Drive Away Time or Minimum Drive Away Time. Complete adhesive curing is necessary to ensure that your car glass can withstand any sort of impact during a mishap or accident.
