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1、SEMIC3.58-0600SPECIFICATIONFOROCTAFLUOROCYLOBUTANE,C4F8,ELECTRONICGRADEINCYLINDERSThisspecificationwastechnicallyapprovedbytheGlobalGasesCommitteeandisthedirectresponsibilityoftheEuropeanGasesCommittee.CurrenteditionapprovedbytheEuropeanRegionalStandardsCommitteeonApril4,2000.I
2、nitiallyavailableonSEMIOnLineMay2000;tobepublishedJune2000.5.1.2.1Three8Xoneinchflatbottomedtesttubes,1Descriptionflexibletubing,flowmeter,pressureregulator.1.1Octafluorocyclobutane,alsoknownas5.1.2.2Reagents—0.02%methylredsolution,0.01Nperfluorocyclobutane,isagasundernormalhyd
3、rochloricacid,freshlydistilledordeionizedwateratmosphericconditions(15°Cand760mmHg).boiledtoremovecarbondioxide.1.2Thegasisanon-flammable,non-toxic,colorless5.1.2.2.10.02%methylred:methylredis1-andodorlessgaswhichisstableundernormalcarboxybenzeneazodimethylaniline.Thisistheacid
4、orconditions.alcoholsolubleformwhichshallbeused.Dissolve20mgofmethylred(acidform)inamixtureof7.44mL2Specificationsof0.01Msodiumhydroxideand70mLofalcoholandPurity:99.99%diluteto100mLwithwater.Thealcoholmustcontainnotlessthan95%v/vethanol.ImpuritiesMaximumAcceptableLevel5.1.2.2.2
5、0.01Mhydrochloricacid:dilute103.0gofNitrogen/Oxygen50ppmhydrochloricacidsolution(SG1.18)to1000.0mLwithMoisture5ppmwatertogive1Msolution.Otherhalocarbons*40ppmAcidity(asHF)1ppmmole5.1.2.2.3Dilute10.0mLofthissolutionto1000.0mLwithwatertogive0.01Msolution.*R13,R23,R114,R113,R11,an
6、dR1165.1.2.2.4Alternativelypreparebythedilutionofa3ReferencedStandardscommerciallyavailablestandardsolution.None.5.1.3OperatingProcedure4PhysicalConstants(forinformationonly)5.1.3.1Attachasuitableregulatortothecylinderoutlet.FormulaC4F8orCF2•CF2•CF2•CF2Molecularweight2005.1.3.2
7、ConnecttheflowmetertotheregulatorusingMeltingpoint-40.2°Cflexibletubing.Boilingpoint115°C5.1.3.3OpenthecylindervalveandpurgetheRelativedensity,gas6.9(air=1)flowmeterwithoctafluorocyclobutane.Relativedensity,liquid1.6(water=1)5.1.3.4Pour50mLofcarbondioxidefreewaterintoVaporpress
8、ure20°C2.7bareachofthree8Xoneinchflatbottomedtesttubes
