51 31... Notes on window bonding: Hardening

The adhesive hardens by reacting with air humidity at room temperature.

Minimum hardening time (table) is obtained from 22 °C and 38 % relative air humidity.

A relative humidity of < 30% significantly slows hardening.

At ambient temperatures above 23 °C and 50 % relative air humidity (hot countries), the adhesive open time is shortened to approx. 5 minutes (skin formation time).

The adhesive hardening process is interrupted completely at ambient temperatures below 5 °C. In this event, there will be no increase in the strength of the bonded connection.

Do not subject the vehicle to load on one side during the minimum hardening time (see table, without front passenger airbag), such as e.g.:

• one wheel on curb
• vehicle hoist
• etc.

Maneuvering inside garage/workshop:

• only permitted on level ground
• do not under any circumstances drive over approach ramps, e.g. into multi-storey car parks

Remove adhesive tapes after hardening time.

If you fail to adhere to the minimum hardening times (see table, without front passenger airbag):

• Leaks and/or wind noises may occur at the window glass

Minimum hardening time:

Minimum hardening time "without front passenger airbag" (after which vehicle can be moved)	Minimum hardening time "with front passenger airbag" (countries where seatbelt use is not required by law)
1 hour	2 hours (1)
NOTE: (1) Vehicles with front passenger airbag: The vehicle can be transferred to the customer after a 1-hour hardening time with the following warning: Once the windscreen glass has been bonded, all occupants must travel with their seat belts attached for 1 hour.