SEMI G11-88 RECOMMENDED PRACTICE FOR RAM FOLLOWER GEL TIME

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1、SEMIG11-88N/A©SEMI1981,1996RECOMMENDEDPRACTICEFORRAMFOLLOWERGELTIMEANDSPIRALFLOWOFTHERMALSETTINGMOLDINGCOMPOUNDS1Scopesmallthatflashingdoesnotoccurabovethefirstseal-inggrooveontheram.Thismethoddescribesaprocedureformeasuringtheßowandgelcharacteristicsofsemiconductorgrade4.2Standa

2、rdSpiralFlowMoldÑPerASTMDtransfermoldingcompoundsusingaramfollower3123.device.4.3RamFollowingApparatusÑConsistingofadis-placementtransducerattachedtothetransferramof2ApplicableDocument1thepressinsuchawayastoaccuratelyrecorditsASTMD3123ÑPlastics,Molding,andExtrusionsmovement,suita

3、blepowersupplyforthedisplacementtransducer,andarecordercapableofrecordingthesig-3SigniÞcancenalfromthedisplacementtransducerandpreferablyhavingachartspeedofatleast10mmpersecond.An3.1Theßowofamoldingcompounddependsontheoptionalvelocitytransducercanalsobeusedasainteractionofseveral

4、variables,andisameasureofthemeansofdirectlymeasuringramvelocityandverify-combinedcharacteristicsofspeedofgelationandmeltingthestartingandendingoftheflowprocess.Inthisviscosityoftheparticularcompoundunderthespeci-case,a2-channelrecorderisneeded.Þedconditions.Thetestisnotavalidmeth

5、odforcom-paringthemoldabilityofdifferentcompoundssincea4.4ThermocoupleandPotentiometerÑCalibratedspiralßowtestcannotduplicateactualmoldingcondi-inthe149¡to177¡C(300¡to350¡F)range.(Calibra-tionsindifferenttypesofmolds.tiontobecheckedeverysixmonths.)3.2Themoldabilityofthermosetting

6、moldingcom-5TestConditionspoundshasgenerallybeendeÞnedbyasinglespiralßownumber.Theramfollowerdevicefollowsgraphi-5.1MoldingCompoundÑRefrigeratedshipmentcallythemoldingcompoundasitmeltsandtherateofandstorageofsomemoldingcompoundsisnecessary.ßowincreases,asviscositybuildsupduetores

7、inpoly-Themoldingcompoundistobeatroomtemperaturemerization,andastheßowofthecompoundceases.beforethecontainerisopened.OncethecompoundThus,itmeasuresthegelationpointofthecompound,hasequilibratedtoroomtemperature,thetestshouldorthepointwherethematerialceasestoßow.Thisberunwithin16ho

8、urs.Caremustbetakentopreserveinformation