Designation:C621−09(Reapproved2014)StandardTestMethodforIsothermalCorrosionResistanceofRefractoriestoMoltenGlass1ThisstandardisissuedunderthefixeddesignationC621;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthecorro-sionresistanceofrefractoriesincontactwithmoltenglassunderstatic,isothermalconditions.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E220TestMethodforCalibrationofThermocouplesByComparisonTechniques3.SignificanceandUse3.1Thistestmethodprovidesarapid,inexpensivemethodforcomparingthecorrosionresistanceofrefractories.Theisothermalconditionsofthistestmethodrepresentthemostseverestaticcorrosionenvironmentpossibleatthespecifiedtesttemperature.Thistestmethodissuitableforqualitycontrol,researchanddevelopmentapplications,andforprod-uctvaluestudiesonsimilarmaterials.Testsrunataseriesoftemperaturesareoftenhelpfulindeterminingtheusetempera-turelimitationsofaparticularmaterial.Melt-linecorrosionresultsarealsoausefulindicationofrelativeresistancetobothupwardanddownwarddrillingcorrosionmechanisms.Exami-nationoftestspecimensalsoprovidesinformationaboutthetendencyforaparticularrefractorytoformstonesorotherglassdefects.3.2Becausethistestmethodisbothisothermalandstaticandsincemostglass-contactrefractoriesoperateinadynamicsystemwithathermalgradient,testresultsdonotdirectlypredictserviceinafurnace.Theeffect...
