GMNA-9981321-1993.pdf
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1、I GENERAL MOTORS ENGINEERING STANDARDS I Materials and Processes - Adhesives I ADHESIVE, CONTACT, RUBBER, WEATHERSTRIP 9981 321 1 SCOPE. This specification covers a solvent borne adhesive suitable for bonding weatherstrips to painted body panels. It can also be used in applications that require gaso
2、line resistance. 1.1 This system must be capable of being dispensed with cur- rent production equipment. It shall be compatible with weatherstrips and paint systems. 1.2 KEY WORDS: Adhesive, trim, contact, rubber, weather- h P 2 REFERENCED STANDARDS. GMlOOOM GW63P ASTM Dl 875 GM9OlOP GM9832P SAE J15
3、24 GM9505P ASTM D471 3 REQUIREMENTS. 3.1 TOXICITY. The toxicity shall be disclosed in kind and magnitude, as required, by the GM Material Safety Data Sheet. In addition, the material must have full approval of the appro- priate d c a l department prior to production use. 3.2 RESTRICTED MATERIALS (GM
4、lOOOM). Materials approved to t h i s specification must not contain restricted mate- rials, as identified in GMlOOOM. 3.3 STABILITY (GW63P). Material conditioned using potential storage conditions must be capable of passing all the m p i r e m e n t s of this specification. 3.3.1 Elevated Temperatw
5、e Stability. As shipped, the adhe- sive must be capable of withstanding a temperature of 55C for 72 4 without any deleterious effects. 3.3.2 Storage Stability. The shelf life of the adhesive in closed containers shall be 90 days at a temperature not to exceed 35C. Shelf life of the material commence
6、s upon the rtccipt of t h e material from t h e manufactum. 3.4 MATERIAL PROPERTIES - UNCURED A D W I S E . See Table 1. 35 MATERIAL PROPERTIES - CURED ADHESIVE. See Table 2. 4 ADHESIVE PROPERTIES. Test specimns, ptparcd as specified in the designated procedures, must meet the fol- lowing requiremen
7、ts. 4.1 WET STRENGTH. Weatherstrips bonded as follows shall display bond strengths no lower than those specified in Table 3. TABLE 1 - UNCURED ADHESIVE Properties values Color The material shall Odor Uniformly Black have an acceptable odor in either cured or uncured condition. Homogeneity voc Solids
8、 Content Viscosity Material must be homogeneous and free of lumps or air bubbles. 5 0 9 g n f 7 2 48 f 7% by weight 14 - 50 s specific Gravity I 0.87 - 0.94 Test Methods v i s u a l GM9832P GM9010P SAE J1524(Aged per GM9763P), 140 kpa ASTM Dl875 TABLE 2 - CURED ADHESIVE Gasoline ASTM D471 ReSiStanCX
9、, Change in Volume TABLE 3 Open The, minutes min Peel Strength, N/m 1 175 5 88 175 30 525 25 525 20 580 15 230 10 4.1.1 Brush a medium coat (0.005 - 0.010 mm) of adhesive on lengths of weatherstrip. After each of the open times in Table 3, bond a length of weatherstrip to a painted (production base
10、coat/clear coat enamel) steel panel. Use 10 s hand contact pressure to ensure an adequate bond. Imnatdiatcly after bond- i n g , check the adhesion by peeling 9 0 with a Huntcr scale o r equivalent. 4.2 STRENGTH VERSUS DRYING TIME. Using 1 minute open time and bonding as described in 4.1.1, the adhe
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