GMW GMW18656 PDF

This specification details the physical and performance requirements for preformed (non-pumpable) sealer materials. The parts are installed manually and will be used as a sealer to prevent water leaking past a mechanical fastener (see Appendix A, Figure A1). The material shall include the sealing substrate itself (non-baked), plus ceramic beads to prevent torque loss of the fastener. The sealer material can be applied in body shop and be cured in the Paint Shop Electrocoat or Electrodeposition (ELPO) oven. This material also can be applied in General Assembly (GA) and therefore will not require bake. Torque requirement will be specified by GM Design Responsible Engineer (DRE).

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.

Materials approved to this standard may be either Tacky or Non-Tacky.

Tacky (T).

Tacky sealer materials may be formed into parts which are applied directly to oily metal. The parts shall remain in position in the uncured state up to and throughout the pretreatment and ELPO processes.

Non-Tacky.

Non-Tacky sealer materials generally require a carrier or fastener to hold sealer materials in place in the uncured state, up to and throughout the pretreatment and electrocoat processes. Parts made from these materials shall allow sufficient clearance between the uncured part and the adjacent metal to enable electrocoat coverage behind the part and therefore prevent corrosion.

Symbols.

Not applicable.

Applicability.

These materials are applied manually in the Body Shop or General Assembly (GA).

Remarks.

These materials are not intended to be weldable or fuel resistant.

Submission Package.

A submission package shall be submitted for final approval of a material to this specification. The submission package shall contain a submission letter, product data sheet, panel preparation data, test data and results, bake charts, and Production Part Approval Process (PPAP) warrant data. Test panel performance shall be photographically documented, able to be transferred electronically, and retained with the submission package.