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 specification describes the functional requirements for a sheet form material (either flexible, soft, rigid and/or combination of both) used inside the vehicle door to block the intrusion of water, air, dust and/or noise into the passenger compartment. The intrusion levels of water, air, dust and/or noise shall be specified by the Statement of Requirements (SOR) for each program. The material assemblies, meeting the requirements of this specification, shall function in continuous operating temperatures from (-30 to 80) °C with expected intermittent exposure to automotive industry paint repair cycles. These materials shall not stain fabric surfaces. The three (3) families of material constructions described herein are supplied with an adhesive on one (1) side and a release surface on the opposite side so that they may be stacked for shipping. They may be flat or formed to fit the shape of door components as required by the Vehicle Program Component Technical Specification (CTS) and SOR.

Material Description.

Materials conforming to this specification may be supplied to the assembly plant and applied to the door on the assembly line as one of the types listed in 1.1.1.3.

All families of door sealing systems shall adhere to the door sheet metal with an adhesive which meets or exceeds the requirements in 3.7.

Material Identification. Reference GM Best Practice KPAC WATDEFL-1.

Note: The supplier shall work with the GM Design Release Engineer (DRE) to comprehend this requirement.

Family 1 Materials, (For Level A and Level B Vehicles).

a. Barrier material shall consist of Ethylene Vinyl Acetate (EVA).

b. The EVA materials, prior to forming, shall have mass per unit area as follows:

• Mass per unit area of Level A shall be (1.465 ± 0.7) kg/m².

• Mass per unit area of Level B shall be (0.851 ± 0.4) kg/m².

c. Thickness of EVA barrier shall be 1.00 mm Reference for Level A barrier materials.

d. Thickness of EVA barrier shall be of 0.60 mm Reference for Level B barrier materials.

Note: Variation in thickness may occur due to density tolerances.

e. Barrier material shall be adhered to door sheet metal with non-gassed hot melt adhesive that meets requirements in Table 1. Dispensed bead dimension shall be documented on part drawings, math data files, and all test reports.

Family 2 Materials, (For Level C, Level D, and Level E Vehicles).

a. Barrier material shall consist of Polypropylene (PP) or Polyethylene (PE) film.

b. Both PP and PE barrier materials shall have density of (0.120 ± 0.006) kg/m².

c. The thickness of PP and PE barrier materials shall be (0.15 to 0.25) mm.

Note: Variations in thickness can occur due to density tolerances.

d. Barrier material shall be adhered to door sheet metal by an adhesive which can be spray or gravure applied and meets requirements in Table 1.

Family 3 Materials (For Level C, Level D, and Level E Vehicles).

a. Barrier material shall consist of a PE foam sheet.

b. The PE foam material shall have a density of (0.440 ± 0.022) kg/m².

c. The thickness of the PE shall be 0.6 mm.

Note: Slight variation in thicknesses may occur due to density tolerances.

d. Barrier material shall be adhered to door sheet metal with non-gassed hot melt adhesive that meets requirements in Table 1. Dispensed bead dimension shall be documented on part drawings, math data files, and all test reports.

Note: Data generated for Level A through Level E Vehicles are acoustic performance standards generated from Vehicle Market Segmentation Card.

Symbols.

Not applicable.

Applicability.

Door noise barrier water deflectors.

Remarks.

Changes in part composition or construction shall be approved by the GM DRE and GM Materials Engineer. Any deviation from GM Best Practice KPAC WATERDEFL-1 shall be approved by the Global Subsystem Leadership Team (GSSLT) and Technical Specialist.

The data obtained by these methods are applicable to the material under conditions of the particular test and are not necessarily the same as those obtained in the vehicle. Data obtained may also be used for statistical process control to measure the effectiveness of the production system.