GMW-15067-2007.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Material Specification General GMW15067 Vibration Damping Heat Fusible Pads Copyright 2007 General Motors Corporation All Rights Reserved November 2007 Originating Department: North American Engineering Standards Page 1 of 4 1 Scope This specification covers the requ
2、irements for a sheet vibration damping heat fusible material intended for use on inverted vertical or horizontal surfaces. The material may come in the form of a single layer, constrained layer or a multilayer composite. 1.1 Material Description. Heat fusible bitumen pads which are applied on painte
3、d sheet metal in order to provide a damping effect on the body. Before the paint shop oven these mats are to be set on the specific places what generates the following classification. 1.1.1 Type I: A standard bitumen material with a hot melt adhesive and can be applied in the paint shop. 1.1.2 Type
4、II: A magnetic material with a hot melt adhesive and can be applied in the paint shop. The magnetic strength shall not be less than 18 mT. 1.1.3 Type III: A material which comes with a pressure sensitive adhesive on the attaching surface to enhance adhesion for difficult to bond areas. 1.1.4 Type IV
5、: The same as Type I or Type II materials except with an epoxy restraining layer to induce stiffening. 1.2 Typical Applications. Correlation between common panel position forms for part setting on the determined place before entering the paint shop oven for curing and examples of application. See Ta
6、ble A1. 1.3 Deadeners Materials Identification. Heat fusible materials specifications identifications and equivalence between them. See Table A2. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D903 SAE J163
7、7 ISO 845 2.2 GM Standards/Specifications. GM9011P GMW3182 GME 60295 Part 5 GMW3205 GME 60295 Part 6 GMW3221 GME 60295 Part 12 GMW3232 GMW3001 GMW3235 GMW3010 GMW3259 GMW3059 GMW4217 GMW3154 GMW14124 3 Requirements 3.1 Unless otherwise specified, the following requirements must be met, and all tests
8、 shall be performed on materials representative of production processes as defined in GMW3221, Code A. 3.2 Physical Requirements. 3.2.1 Weight. GMW3182. Weight shall be specified on the engineering drawing. Weight per Unit Area. Determined with scales providing an accuracy of 1 g. 3.2.2 Thickness. F
9、ollowing paint bake at the assembly plant, thickness shall be 3.0 mm maximum or as specified on the engineering drawing. Measured with caliper rule. 3.2.3 Specific Gravity, ISO 845. Specific gravity range shall be 2.0 to 2.8. 3.2.4 Tensile Strength, GMW3010. Minimum. 0.5 MPa 3.2.5 Flexibility, GMW31
10、54. There shall be no evidence of cracking when the material is bent around a 100 mm diameter mandrel at room temperature. 3.2.6 Mold Resistance, GMW3259. There shall be no mildew growth. 3.2.7 Blocking Resistance. Ten (10) layers of the material must separate cleanly with no evidence of sticking wh
11、en tested as follows: 50 X 50 mm samples shall be stacked and exposed at 50C for 16 h under a 3.5 kPa load. Allow cooling to room temperature before separating. A release paper may be used to facilitate meeting this requirement. 3.2.8 Magnetic Force. A 400 X 200 mm size test piece shall be prepared
12、extracting it from a magnetic part. A quarter of a test piece shall be fixed by magnetic force on a painted sheet metal GMW15067 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2007 General Motors Corporation All Rights Reserved Page 2 of 4 November 2007 electrodeposition (ELPO). See Figure 1. The test
13、 piece shall not fall down for 25 minutes minimum. This test shall be performed at 23 2C and 55 5% Relative Humidity (RH). Test piece dimension: 400 X 200 mm Figure 1: Magnetic Force 3.2.9 Adhesion. 3.2.9.1 Release Liners. The Type III materials comes with a release liner, which must remain in posit
14、ion throughout shipping and handling. 3.2.9.2 The force required to remove the release liner shall not exceed 2 N/100 mm when tested per ASTM D903. 3.2.9.3 The Types I, II and IV materials measuring 25.4 X 150 mm shall be applied to production intent substrates measuring 30 X 100 mm. The material wi
15、ll not be required to be rolled out. 3.2.9.4 The Type III material measuring 25.4 X 150 mm shall be applied to production intent substrates measuring 30 X 100 mm. The material will then be rolled out using a 500 g roller. 3.2.10 Storage Stability. The shelf life of the materials shall be 90 days at
16、+5 to 35C. Shelf life commences upon receipt of material from the manufacturer. 3.3 Requirements After Baking Process. The material must have good adhesion and exhibit no cracking or other deleterious effects. Standard Baking Condition: 20 3 minutes at +165 5C (e.g., for GME, LAMM, GMNA, GM Holden)
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