GMW GMW15960 PDF

This specification is intended to cover the adhesion performance of flexible moldings (glass lace, reveal, etc.) which are bonded to automotive glass. The bond is intended to be the primary retention method for attachment of these moldings to glass during the service life of the vehicle.

Material Description. The materials tested to this specification are typically molded Ethylene propylene diene (EPDM), Polyvinyl chloride (PVC), or Thermoplastic elastomer (TPE) trim parts bonded with one or two component, warm or cold temperature applied moisture cure, black polyurethane adhesive sealing compounds or by direct extrusion on glass. These are used in conjunction with compatible primers for bonding to automotive glass.

Typical Applications. Materials and process applications tested to this requirement are typically non-pressure sensitive bonded flexible moldings. For pressure sensitive bonded molding performance, see GMW15671.

General Description.

This specification encompasses two different modes of performance validation. The first is the evaluation of the quality and acceptability of the molding prime operation. A section of molding that has been subjected to the production prime operation is embedded into a fresh bead of representative urethane adhesive and allowed to cure. Upon cure and exposure to the prescribed environmental exposures, the molding section is pulled (or peeled) from the adhesive bead and the separation mode is noted.

The second type of performance requirement covered in this specification is an actual part test (or plaque test) where the representative bonding process and materials are used. After cure, a proof load is applied to the molding to validate acceptable "pull-off" performance of the system. Upon meeting the proof load, the system may be pulled to separation. The mode of separation is observed, evaluated and recorded.