GM-2218M-1994.pdf
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1、m 900637=l 0002394 375 I GENERAL MOTORS ENGINEERING STANDARDS I Materlats and Processes - General I SOUND BARRIERS COMPOSITES GM2218M 1 SCOPE. This specification covers the properties of a composite barrier material of asphalt mastic with layers of cqed hft, antiblocking tissue, and/or polyethykne f
2、ihn lam- ination. 1.1 GENBRAL DESCRIPTION. The materials covered by this specification are heavy weight, flexible, sound deadening sheets having a mastic filkr laminated between paper or plastic sheet facings. These materials with the exception of I $d:py . . . . . . . *. TypeIIIandV . . . . . I. at
3、 10 allothersusca50mmdiaman- dml. Samples will be wrapped around the mandrel with the kraft side out. 3.13 BLOCKING. Four 50 x 50 mm samples will be stacked so that all surface combinations are obtained. The stack will be loaded uniformly with a 3.4 kPa (kilopascal) load 7o C for AUGUST 1994 PAGE 1
4、2218M -,-,- m 700b377 0002375 2OL I . GENERAL MOTORS ENGINEERING sI#NDARDS I Materlals and Processes - General SOUND BARRIERS COMPOSITES GM2218M 16 h and then cookd to room temperature (23 C) before sepa- ration. The layers must separate cleanly without pulling adjacent fibers. Minimal joining of th
5、e mastic due to squeeze out at the edges should be dismgankd. 3.14 cEMElWABlLlTY. 3.14.1 Type I Grade A and Type V. Using production type adhesives such as 9980607, the antiblocking tissue side will be adhexcd to clean steel. When the cement has set, the removal of the deadener from the steel panel
6、must result in delamina- tion of deadener. 3.14.2 Type I Grade B, Type II, Type Iv, l ype VI, and Type VII. Using production-type adhesives such as 9881192, the antiblocking tissue side will be adhexed to clean steeL When the cement has set. the panels will be exposed to 14 days 7o C and to 7 days 3
7、8 C and 100% RH. The removal of the deadener from the panel after exposure must result in delami- nation of the deadener. 3.14.3 Type ICI, Type X, Type XII, and Type XlIL Using production-type adhesives such as 9881192, the creped kraftsi&willbcadheredtockansteel.Whenthcocmnthas set, the panels will
8、 be exposed to 14 days 7o C and to 7 days 38-C and 100% RH. The removal of the deadener from the panel after exposure must result in dekmination of the deadener. 3.14.4 Type VI& rX, XI, or the plastic film side of Type X XJI,andXIUatenottobecement& 4 INlllAL SOURCE APPROVAL No shipment shaU be made
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