Designation:D2755–90(Reapproved1997)e1AnAmericanNationalStandardStandardTestMethodofSamplingandReductiontoTestWeightofElectricalGradeMagnesiumOxide1ThisstandardisissuedunderthefixeddesignationD2755;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.e1NOTE—KeywordswereaddedinOctober1997.1.Scope1.1Thistestmethodcoverstechniquesforsamplinglargelotsofmagnesiumoxide(MgO)andreducingrepresentativesamplestotestweight.1.2Thevaluesstatedinacceptablemetricunitsaretoberegardedasthestandard.Thevaluesinparenthesesmaybeapproximate.1.3Thisstandarddoesnotpurporttoaddressthesafetyproblemsassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.2.ReferencedDocuments2.1ASTMStandards:D2772TestMethodforSieveAnalysisofElectricalGradeMagnesiumOxide23.Apparatus3.1Splitter,consistingofaseriesofchutesfedbyasinglehopper.Thechutesaresoplacedthateachalternatechutedischargestothesamesideofthesampler.Thespacingofplatesmustremain1.6to3.2mm(1⁄16to1⁄8in.).Thesplittershouldbecapableofobtaininghomogeneoussplits.33.2Scoop.3.3Blender—Anycommerciallyacceptableblenderwitha45kg(100lb)minimumcapacity.44.Procedure4.1ForReductionofBulk(—Approximately45kg(100lb))Quantities:4.1.1Blendtheentirecontentofoneormorestandardcontainersforaminimumof15mininasuitablesizedblender.4.1.2Remove1Lofmaterialinaminimumoffivescoopsfromthevariouspartsoftheblender.4.2ForReductionof1LSamples:4.2.1Pourthesampleevenlyintothesplitter,acrossthesplitteropening.4.2.2Whentheentiresamplehasbeenpouredthrough,tapthesideofthesplittertomakesurenobuild-uphasoccurred.Discardthecontentofonepan.4.2.3Ifasmallersampleisrequired,repeatthesplittingprocess.5.Precision5.1Whensamplesfrombothsidesofthesplitteraretestedinaccordancew...
