Safe drive-away time

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The Safe Drive Away Time ( English safe drive away time , SDAT) or minimum drive-away ( English minimum drive away time , MDAT) refers to the waiting time which is necessary for example to a windshield replacement glazing after the installation of a windshield to ensure that the The vehicle is operationally safe again after installation.

Technical background

The use of adhesives to bond windshields and rear windows is standard in automotive engineering today. Compared to all other previously used methods, gluing established itself very early around the world. Gluing in the panes makes a not insignificant contribution to the structural strength of the vehicle.

Airbags explode at speeds of up to 340 km / h and place heavy loads on the vehicle's windshield. The occupants of the vehicle hit the airbag 50 milliseconds after the explosion. This is why most of the stress on the windshield in a road traffic accident comes mainly from the occupants. In order to protect the occupants, the windshield, which is usually glued in, must withstand these forces. In the case of replacement glazing, this bonding may have taken place a short time before the accident. For this reason it is important that the safe drive-away time of the window adhesive is known. This safe drive-away time refers to the waiting time that must be observed after replacement glazing until the vehicle is again considered safe to operate. The criteria for ensuring the safety of the adhesive system are specified for the US market in the Federal Motor Vehicle Safety Standards (FMVSS) 212/208 of the National Highway Traffic Safety Administration . The SDAT is usually determined by means of a crash test or high-speed laboratory test .

The forces acting on the window by the occupants are of course lower when the occupants are belted . This is why adhesive manufacturers usually inform their customers about the level of security that has been achieved.

Examples

  • FMVSS 212/208 meets the standard with belted crash test dummies
  • FMVSS 212/208 meets the standard with a crash test dummy not wearing a seat belt

Individual evidence

  1. ↑ Hans F. Huber: Permanently sticking, 1994, ISBN 3-87870-423-2 , pages 159 ff.
  2. ^ Bob Stenzel: Determining SDAT, AGRR Magazine, March / April 2012, pages 29-30.
  3. ^ Philippe Cognard: Handbook of Adhesives and Sealants . Elsevier, 2006, ISBN 978-0-08-044708-7 (Retrieved May 27, 2012).
  4. ↑ Premium Adhesive Systems, AGRR Magazine, March / April 2012 Page 15th