Designation:E1293−02(Reapproved2012)StandardSpecificationforGlassMeasuringPipets1ThisstandardisissuedunderthefixeddesignationE1293;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrequirementsforglassmeasur-ingpipetsofprecisionandgeneralpurposegrades,usedinmeasuringvolumesofliquids.2.ReferencedDocuments2.1ASTMStandards:2E438SpecificationforGlassesinLaboratoryApparatusE542PracticeforCalibrationofLaboratoryVolumetricApparatusE671SpecificationforMaximumPermissibleThermalRe-sidualStressinAnnealedGlassLaboratoryApparatusE694SpecificationforLaboratoryGlassVolumetricAppa-ratusE920SpecificationforCommerciallyPackagedLaboratoryApparatusE921SpecificationforExportPackagedLaboratoryAppa-ratusE1133PracticeforPerformanceTestingofPackagedLabo-ratoryApparatusforUnitedStatesGovernmentProcure-mentsE1157SpecificationforSamplingandTestingofReusableLaboratoryGlasswareE1273SpecificationforColorCodingofReusableLabora-toryPipets3.Classification3.1Style,ClassandCapacity—Pipetscoveredbythisspeci-ficationshallbeofthefollowingstyles,classes,andcapacities:3.1.1Style1—Standardtapertip.3.1.1.1ClassA—Eachpipetofprecisiongradeshallbemarkedwiththeletter“A”tosignifycompliancewithappli-cableconstructionandaccuracyrequirementsinTable1.Eachpipetmaybemarkedwithapermanentserialnumberattheoptionofthemanufacturer.3.1.1.2ClassB—GeneralpurposepipetsareofthesamebasicdesignasClassApipets.VolumetrictolerancesforClassBpipetsshallbewithintwicethespecifiedrangeallowedforClassApipets.Thesepipetsneednotbemarkedwiththeirclassdesignationorserialnumber.SeeTable1fortolerancesanddimensionalrequirements.3.1.2Style2—Longtapertip(ClassBonly).3.1.3Capacities,(mL)—0.1,0.2,0.5,1,2,5,10,25,and50.4.Design4.1Shape—Thepipetsshallbestraightandofone-piececonstruction.Anycrosssectionof...
