Designation:C773−88(Reapproved2016)StandardTestMethodforCompressive(Crushing)StrengthofFiredWhitewareMaterials1ThisstandardisissuedunderthefixeddesignationC773;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstwotestprocedures(AandB)forthedeterminationofthecompressivestrengthoffiredwhitewarematerials.1.2ProcedureAisgenerallyapplicabletowhitewareprod-uctsoflow-tomoderatelyhigh-strengthlevels(upto150000psior1030MPa).1.3ProcedureBisspecificallydevisedfortestingofhigh-strengthceramics(over100000psior690MPa).1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E4PracticesforForceVerificationofTestingMachinesE6TerminologyRelatingtoMethodsofMechanicalTestingE165PracticeforLiquidPenetrantExaminationforGeneralIndustry3.SignificanceandUse3.1Resistancetocompressionisthemeasureofthegreateststrengthofaceramicmaterial.Ideally,ceramicsshouldbestressedthiswayinuse.Thistestisameasureofthepotentialload-bearingusefulnessofaceramic.PROCEDUREA4.Apparatus4.1TestingMachine—AnytestingmachineconformingtoPracticesE4andtotherequirementsforspeedoftestingprescribedinSections5and12ofthistestmethod,maybeused.4.2SphericalBearingBlock—Inverticaltestingmachines,thesphericalbearingblockshallbespringsuspendedfromtheupperheadofthemachineinsuchamannerthattheupperplatenofthemachine(lowerfaceofthesphericalbearingblock)remainsinacentralposition(sphericalsurfacesinfullcontact)whennotloaded.Thesphericalsurfacesshallbewelllubricated,andthecenterofcurvatureshalllieonthelowerfaceoftheplaten.Thediagonalordiameteroftheplatenshallbeonlyslightlygreater...
