Designation:C326−09(Reapproved2014)StandardTestMethodforDryingandFiringShrinkagesofCeramicWhitewareClays1ThisstandardisissuedunderthefixeddesignationC326;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoflinearshrinkageofceramicwhitewareclays,bothunfiredandfired.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SignificanceandUse2.1Thepurposeofthistestistoobtainvaluesofshrinkageafterdryingandfiringofclaysorbodiesorboth,undervariousprocessingconditionstoenabledesignerstodeterminethepropersizeofmoldordiesoastoproduceapredeterminedsizeoffiredware.3.TestSpecimens3.1Testspecimensshallberoundbarsapproximately0.75in.(19mm)indiameterby5in.(127mm)inlength.3.2Testspecimensmaybepreparedeitherbycastingorplasticforming,ascircumstancesrequire.Atleasttenspeci-mensshallbeprepared.Forcastspecimensthemoldsmaybeeitherone-piece,ortwo-ormore-partmolds;ineitherinstancesufficientspaceshallbeprovidedtoallowsolidcastingwithoutpiping.Whereplastic-formingisemployed,theclay-watermassshallbebroughttoaconsistencythatpermitsthemakingofspecimensrigidenoughtoallowcarefulhandlingwithoutdistortionimmediatelyafterthetestspecimenismade.Plastic-formedtestspecimensshallbemadeeitherbyextrusionorbypressinginasuitablemetalmold.Whereavacuumpugmillisused,avacuumofnotlessthan25in.(635mm)Hgshallbemaintainedduringtheformingoperation.Wherenovacuumattachmentisused,theplasticclayshallbetho...
