51 31... Notes on window bonding: Hardening

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

The adhesive hardens as it reacts with air humidity (with accelerator also due to mixed-in reaction paste) at room temperature.

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

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 multistory 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

1-day system: Adhesives and their minimum hardening times:

ADHESIVE APPLICATION REFERENCE CHART

Adhesive	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)
Hot working with accelerator	2 hours	3 hours*
Cold processing	9 hours	20 hours*

1-hour system: Adhesives and their minimum hardening times:

ADHESIVE APPLICATION REFERENCE CHART

Adhesive

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)

Cold processing

1 hour

2 hours⁽¹⁾

⁽¹⁾	Vehicles with front passenger airbag:

The vehicle can be handed over to the customer after the hardening time (vehicle can be moved, adhesive-dependent) with the following warning:
Once the windscreen glass has been bonded, all occupants must travel with their seatbelts attached for "... hours"!
The time is taken from the "Minimum hardening time" table for countries where seatbelt use is not required by law.

IMPORTANT: If the minimum hardening time is not adhered to:

the front passenger together with the windscreen may fall out of the vehicle in the event of an accident after the front passenger airbag has been triggered

Locate leaks:

by spraying water underneath sealing lips
with ultrasonic leak detector (sourcing reference: BMW Parts Department)

If necessary, seal leakage with appropriate nozzle.