GMNA-9985511-1989.pdf
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1、m 9006379 0003765 200 1 GENERAL MOTORS ENGINEERING STANDARDS 1 Matewlals and Processes - General 1 RUBBER, HEAT CURED LIQUID SILICONE 9985511 1 SCOPE. This specification covers a l-component, addition cue liquid silicone rubber, farmalattd for use in gas- ket applications with temperature rangeusage
2、from4OCto +200 c. 1.1 The product requires elevated tempemtures (200 c min) and time (30 minutes min) to reach fully functional properties. c!uxesatothertiJmsand kmpemhms may mult in changed physical properties. Once applied to the part and cured by heat, the silicone rubber will adhere to most clea
3、n meal surfaces withouttheneedforaprimer.Thejointnlaybtsealedby compression to the mating surface. 1.2 CURE CGMpATIBILITY. Cum inhiiition of this prod- uct can be caused by selective reaction between the catalyzed material and certain impurities present in or on a substrate. This reaction or poisoni
4、ng of the rubber can significantly retard or completely stop the crosslinking requited to cum that potion of the rubber in direct contact with the con 9.5 k MERlALz CONDOFs Rs STEEL OR ALL DlmfsloNs IN MM FIGURE Al - FOLLOWER PLATE (PLUNGER) FOR EXIRUSION RATE TEST OF SILICONE A2.6 Controlled pressu
5、re source including a regulator, gage and necessary shut off co i.e. VIP 1443. 83 PROCEDURE. B3.6 Pull the 2 pairs on the Tmius Olsen tester, Jnstron or Monsanto. Conditions: room temperature, slow speed = 13 mm/mifmte, 500 kg scale. Lap shear strength in kPa is the poundmadingonthediaLIf1pairpuUslo
6、wduetoanobvi- ous flaw, report only the good value. Otherwise, report m-W* B3.1 Take4metalpanekcutto25x75mm.C!kanwithtol- uene and trichloroethykne. Let the panels air dry 30 minutes. 84 REPORTING. B3.2 SpreadtheRTVon25mmendofeachof4metalpan- ek, putting on a minimumofO.6mminanevencoating. B3.3 Inse
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