Designation:E1379−90(Reapproved2016)StandardSpecificationforLaboratoryGlassDewarFlask1ThisstandardisissuedunderthefixeddesignationE1379;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationprovidesstandardmaterialandper-formancerequirementsforglassDewarflaskssuitableforgenerallaboratoryuse.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.2.ReferencedDocuments2.1ASTMStandards:2B85SpecificationforAluminum-AlloyDieCastingsE438SpecificationforGlassesinLaboratoryApparatusE671SpecificationforMaximumPermissibleThermalRe-sidualStressinAnnealedGlassLaboratoryApparatus3.Classification3.1GlassDewarflasksshallbeofthefollowingsizes:265mL,665mL,1000mL,1900mL,4300mLNOTE1—Thetermmillilitre(mL)iscommonlyusedasaspecialnameforthecubiccentimetre(cm3)andsimilarlythelitre(L)for1000cubiccentimetres,inaccordancewiththeInternationalSystemofUnits(SI).4.MaterialandAnnealing4.1FlasksshallbemadeofborosilicateglassconformingtotherequirementofTypeI,ClassA,SpecificationE438.4.2MaximumresidualthermalstressshallconformtoSpecificationE671.4.3AluminumbasealloymetalshallconformtoAlloyNumberA380ofSpecificationB85.5.Appearance5.1ThegeneralappearanceoftheflasksshallconformtoFig.1.6.Design6.1Flasksshallbecylindricallyshapedandhavedoublewallssilveredontheinside.Thespacebetweenthewallsshallbeevacuatedtoavacuumlevelof5×10−7Torrandsealed.Temperaturesaretobeheldinexcessof500°Cduringevacuation.6.2Flasksshallbefirmlycementedintothebasetoprotectthesealingtip.6.3Flasksshallhaveaprotectiveplasticmesh,orshallbecoatedwithabaked-onplastisoloverexposedglasssurface.7.CapacityandDimensions7.1StandardDewarflasksforgovernmentuseshallcon-formtotherequirementsofTable1.7.2OtherDewarflasks(notfoundinTable1)areapprovedforuseiftheymeetalloft...
