SEMI C39-0699 SPECIFICATION FOR POTASSIUM HYDROXIDE PELLETS

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1、SEMIC39-0699SPECIFICATIONFORPOTASSIUMHYDROXIDEPELLETSThisspecificationwastechnicallyapprovedbytheGlobalProcessChemicalsCommitteeandisthedirectresponsibilityoftheNorthAmericanProcessChemicalsCommittee.CurrenteditionapprovedbytheNorthAmericanRegionalStandardsCommitteeonApril23

2、,1999.InitiallyavailableonSEMIOnLineMay1999;tobepublishedJune1999.ThisdocumentreplacesSEMIC1.14initsentirety.Originallypublishedin1978.acid.(Savethissolutionforthepotassiumcarbonate1Purposetest.)1.1ThepurposeofthisdocumentistostandardizemL´NofHCl´112.2%Assay=requirementsforp

3、otassiumhydroxidepelletsusedinWeightofsampleg()thesemiconductorindustryandtestingprocedurestosupportthosestandards.Testmethodshavebeenshown8.2PotassiumCarbonate(K2CO3)—Totheaboveti-togivestatisticallyvalidresults.Thisdocumentalsotratedsolution,add0.15mLofmethylorangeindicato

4、rprovidesguidelinesforgradesofpotassiumhydroxidesolutionandcontinuethetitrationwith1Nhydro-pelletsforwhichaneedhasbeenidentified.Inthecasechloricacid.Theadditionalhydrochloricacidisequiv-oftheguidelines,thetestmethodsmaynothavebeenalenttothatconsumedbythepotassiumcarbonate.s

5、tatisticallyvalidatedyet.mL´N´HCl´138.2%KCO=23Weightofsampleg()2Scope8.3AmmoniumHydroxidePrecipitate—Weighabout2.1Thescopeofthisdocumentisallgradesof10gofsampleanddissolveinabout100mLofwater.potassiumhydroxidepelletsusedinthesemiconductorindustry.8.3.1Cautiouslyadd12mLofsulf

6、uricacidto15mLofwater,cool,thencautiouslyaddthemixturetothe3Limitationssolutionofthesampleandevaporatetodensefumes.Cool,dissolvetheresiduein130mLofhotwater,and3.1None.addammoniumhydroxideuntilthesolutionisjustbasictomethylred.4ReferencedDocumentsSEMIC1—SpecificationsforReage

7、nts8.3.2Heattoboiling,filter,washwithhotwater,andignite.Theweightoftheresidueshouldnotexceed25Terminologymg.5.1None.8.4InsolubleMatter—Dissolve50gofsamplein250mLofcarbondioxide-freewaterina500mL6PhysicalProperty(forinformationonly)stopperedflaskandcoolto25°C.Thesolutionshoul

8、dbeclearandcolorless.Filterthroughatared,medium-6.1Notapplicable.porosityfi