Designation:C693−93(Reapproved2013)StandardTestMethodforDensityofGlassbyBuoyancy1ThisstandardisissuedunderthefixeddesignationC693;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthedensityofglassesatornear25°C,bybuoyancy.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:E12TerminologyRelatingtoDensityandSpecificGravityofSolids,Liquids,andGases(Withdrawn1996)23.Terminology3.1Definitions:3.1.1densityofsolids—themassofaunitvolumeofamaterialataspecifiedtemperature.Theunitsshallbestatedasgramspercubiccentimetre(seeTerminologyE12).4.SignificanceandUse4.1Densityasafundamentalpropertyofglasshasbasicsignificance.Itisusefulinthephysicaldescriptionoftheglassandasessentialdataforresearch,development,engineering,andproduction.5.Apparatus5.1AnalyticalBalance,withsensitivityandaccuracyof0.1mg.5.2Beaker,ofconvenientcapacity(250to750cm3)tofitinsidethebalancechamberandallowimmersionofthebasketorwireloopspecimenholderindistilledwater.5.3Thermometers,calibrated(20to30°C),sensitiveto0.1°Cfordeterminingairandwatertemperatures.5.4Nickel-Chromium-IronorPlatinum-AlloyWire,lessthan0.2-mmdiameterforsuspendingthespecimeneitherinabasketoraloopmadeofthesamewire.Thesuspensionwireshallbecleanedbydegreasingorheatinginavacuum.3Anacceptablealternativemethodofcleaningtheplatinum-alloywireistoheatinanoxidizinggasflameuntilthereisnolongeranycoloremittedfromthegasespassingaroundthewire.5.5Weights,withaccuracyof0.1mg.5.6Barometer,withsensitivityof1-mmHg(optional,seeNote3).6.Reagent6.1DistilledWater,fresh,boiled,andusedw...
