Designation:D1076−21StandardSpecificationforRubber—Concentrated,AmmoniaStabilized,Creamed,andCentrifugedNaturalLatex1ThisstandardisissuedunderthefixeddesignationD1076;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversrequirementsforfirstgradeconcentratednaturalrubberlatex(seeTable1)ofthefollowingcategories:Category1—CentrifugedHeveanaturallatexstabilizedwithammoniaonly.Category2—CreamedHeveanaturallatexstabilizedwithammoniaonly.Category3—CentrifugedHeveanaturallatexstabilizedwithlowammonia.Category4—Centrifuged,orcentrifugedandcreamed,gu-ayulelatex,orothernaturalrubberlatex,containinglessthan200µgtotalproteinpergramdryweightoflatex,withammoniaorotherhydroxide.Category5—CentrifugedHeveanaturallatextreatedwithaluminumhydroxideorbyothermeans,stabilizedwitham-moniaonlycontaininglessthan0.5%non-rubbercontent.1.2Thisspecificationisnotnecessarilyapplicabletolaticesprepared,stabilized,orpreservedbyothermethods,andshallnotbeconstruedaslimitingthedesirabilityorusefulnessofothercategoriesoflatices.ItdoesapplytonaturallatexsourcesotherthanHeveabrasiliensisbutdoesnotapplytocom-poundedlatexconcentrates.1.3Theanalyticalproceduresapplicabletothespecifica-tionsareincludedandappearinthefollowingorder:SectionSampling6and7TotalSolids8DryRubberContent9ProteinContent10TotalAlkalinity11Viscosity12SludgeContent13CoagulumContent14KOHNumber15pH16MechanicalStability17CopperandManganese18Density19–31VolatileFattyAcids32–36BoricAcid37DryFilms38PrecisionforAllTestMethods391.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternatio...
