GMNA-9984189-1992.pdf
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1、ii 7006379 0004645 203 1 GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Paint I SEALER - PREFORMED STRIP FLEXIBLE FLOWABLE, EXPANDING 9984189 1 SCOPE. This specification details the requirements of an extruded, flexible, flowable. expanding sealer. This material is intended to seal
2、 body joints against water, dust and air intru- sion. GM98OlP and baked as follows (specified in metal tempera- tures): 1.1 The material must be a smooth and homogeneous mixture free of air, lumps, unmixed particles and foreign materials. High Bake Enamel Systems: 25 min at 157 C + 25 min at 115 C 1
3、.2 The material must adhere to E-coat as detailed on the Sealer Substrate Compatibility Chart for each approving divi- sion. It must have good weatherability. 1.3 Low Bake Enamel Systems: 25 min at 115 C + 25 min at 115 C Type A - Tacky (supercedes 9984203 and 9984204 Type C and D) Type B - Nontaclc
4、y (supercedes 9984202 and 9984204 OP=A=B) Type C - (supercedes 9985663) The sealer must not crack or lose adhesion to the substrate dur- ing or after the following conditions: Initial: After cooling at ambient conditions for 24 h Heat Aging: 336 h at 7o C 2 REFERENCED STANDARDS. Humidity ( GM4465P):
5、 168 h at 38 UlOO % RH GM4298P GM9763P GM9832P GM4465P GM9773P ASTM D792 GM9010P GM9801P GM9037P GM9828P 3 REQUIREMENTS. Specific material requirements and appropriate test methods are listed under properties. All bake schedules are specitled in metal temperatures. Cold Slam (GM9773P): 10 slams at -
6、3OT Exterior Cycle (GM9505P. Cycle P): 6 wks 3.2.2 Corrosion Resistance. Apply 2 beads of sealer 3 mm high x 40 mm wide x 200 mm long to the surface of a phos- phated steel panel (inspect fast to be sure it is free of surface corrosion). Bake 1 h 2OOC. Remove from the oven and allow the panel to coo
7、l to room temperature. 3.1 PHYSICAL PROPERTIES. 3.1.1 Specific Gravity (ASTM D792): 1.1-1.5 typical. However, an individual specific gravity range for each approved source will be set at the time of approval to this specification. The specific gravity range will become a rquire- ment of the material
8、. 3.2.2.1 Initial Adhesion. The material must exhibit good adhesion to the substrate with no cracking, separation or other deleterious effects. Remove one sealer bead from the panel. There must not be any corrosion on the panel surface under- neath the sealer. 3.2.2.2 Humidity (GM4465P). Subject the
9、 panel to 168 h 38 C 100% RI-I. 3.1.2 Solids Content (GM9010P) 97% min. 3.1.3 Odor (GM9832P). The sealer must not have a toxic or noxious odor. 3.2.2.3 Remove the last sealer bead from the surface of the panel after humidity testing. There must not be any corrosion on the panel underneath the sealer
10、 bead. 3.1.4 Toxicity. The material must not adversly affect person- ncl handling it. 3.1.5 Tack (Type A only). Tack is either satisfactory or not satisfactory. Press a piece of material 10 x 25 x 25 mm onto an E-coated metal panel and hold for 2 s. When the finger is lifted off, there shall be no m
11、at&al transfer to the skin nor lifting of the sealer from the panel. 3.2.3 Expansion ( GM9037P). Samples baked according to the appropriate bake schedule in 3.2.lshall have the following expansion: 3.2 PERPORMANCB REQUIREMENTS. Low Bake Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12、 . . . . . . . . . . -. 20-70% High Bake Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70-120% 3.2.4 Bridging. The material shall bridge a 3 mm vertical gap without any sag through when b&cd as described in 3.2.1. 3.2.1 Adhesion. One set of sea
13、ler panels per each substrate as detailed on the Sealer Substrate Compatibility Chart, under this specification for each approving division, shall be prepared per 3.2.5 Plow. Apply a 3 x 100 mm bead of sealer to an E- coated panel and bake per the appropriate bake schedule in 3.2.1. The material mus
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