GMNA-9985718-1994.pdf
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1、9006379 0000493 535 I GENERAL MOTORS ENG IN EERI NG STAN DARDS I Materials and Processes - Adhesives 1 ADHESIVE, HOT MELT, PRESSURE SENSITIVE 998571 8 1 SCOPE. This specification describes the requirements of an extrudable pressure sensitive hot melt adhesive for bond- ing reclaimed cotton fiber (sh
2、oddy pad) sound deadening material to ABS polypropylene, fiber board and painted metal. 1.1 The adhesive must be capable of being dispensed with conventional hot melt equipment and must exhibit sufficient open time for proper surface wet out and good bond forma- tion. 1.2 The adhesive is amber in co
3、lor and shaii be a smooth homogeneous product free fiom foreign paaicles that are detri- mental to production operations. It must be capable of being dispensed at temperatures of 162 to 1WC without oxidizing or charring in the dispensing equipment at the application tem- peratures. 2 REFERENCED STAN
4、DARDS. GMlOOOM GM9763P GM9010P GM9832P 3 REQUIREMENTS. See Table 1. 3.1 RESTRICTED AND REPORTABLE CHEMICALS (GMloOOM). By 1997 start of saleable vehicles, a i l materiais supplied to this specification must comply with the require- ments listed in GMlOOOM, “Restricted and Reportable Chemicals.“ 3.2
5、180 peel strength and heat resistance samples are pre- pared for testing as follows: 3.2.1 Extrude 6.4 mm bead to base substrate (plastic, metai). 3.2.2 Utilize 15 to 30 s open time before combining shoddy pad to base substrate. 3.2.3 Condition samples for 24 h a t room temperature prior to testing.
6、 3.3 Bonded parts are tested for heat resistance by placing the assembly in an air circulating oven at 40C for 1 h then increasing the temperature WC/h until failure (delamination of shoddy pad to base substrate in vertical position) occurs. 4 INITIAL SOURCE APPROVAL No shipment shall be made by any
7、 supplier until representative initial production samples have been approved by engineering as meeting the requirements of this specification. 4.1 Completed copies of the GM Material Safety D a t a Sheet and Critical Material Register (available h m the engineering department or laboratory), or equi
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