GMW15921

Description / Abstract: GMW15921, 5th Edition, February 2020 - Adhesion Requirements for Bonding Exterior Fiber Reinforced and Non-Fiber Reinforced Plastics

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose/Material Description.

This standard is intended to cover the material and performance requirements of structural adhesive candidates that are used to bond plastic automotive body substrates. These substrates include thermoset Fiber Reinforced Plastics (FRP) such as Sheet Molding Compound (SMC) and Structural Reaction Injection Molded (SRIM), and non-fiber reinforced plastics in structural exterior applications.

Symbols.

Not applicable.

Applicability.

Exterior structural applications of all vehicles.

Remarks.

It is anticipated that assemblies bonded with these types of adhesives will incorporate a mechanical means of attachment or special fixturing to maintain dimensional accuracy of the assembly until the adhesive has attained enough strength for handling.

It is further anticipated that this specification shall cover “true” structural bonding applications, that is cases where substrates are joined primarily by adhesives and the joint must maintain an acceptable strength level throughout the life of the vehicle.

For bonding performed at a tier supplier, the supplier is responsible for evaluating in-house approved adhesives on production intent substrates for compliance to this specification.