Designation:D1951–86(Reapproved1995)e1StandardTestMethodforAshinDryingOilsandFattyAcids1ThisstandardisissuedunderthefixeddesignationD1951;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.e1NOTE—UnitofmeasurementstatementandKeywordswereaddededitoriallyinMay1995.1.Scope1.1Thistestmethodcoversthedeterminationoftheresidueorashresultingfromignition,underprescribedconditions,ofallnaturalandsyntheticdryingoilsandtheirfattyacids.Thistestmethodisnotapplicabletoboiledoils.NOTE1—Boiledoilsdonotgivereproducibleresults.Leaddriersarepartiallyreducedbythecarbontogivemetallicleadandoxidesofvariablecomposition,andzincoxideisrelativelyvolatileatthemufflefurnacetemperature.Ashdeterminationsonboiledoilsconsequentlyareempiricalandnothighlyreproducible.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityofwhoeverusesthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardstatementsaregiveninSection4.2.SignificanceandUse2.1Mostnaturalandprocessedoilscontainsmallamountsofash,buttheamountisinsignificant.Certain,syntheticdryingoilsmaycontainresidualcatalystorothermaterials,thusgivinglargeramountsofash.Althoughtheashandmetalcontentofboiledoilsmaybespecified,thetrendwithnewandimproveddriersistowardthespecificationofdryingtime,allowingthemanufacturertoobtainthisinanywaydesired.2.2Inthistestmethod,ashisdeterminedbyignitingthespecimenunderspecifiedconditionsandweighingtheresidue.Duetothevolatilityorthereductionofcertainmetaloxides,someinaccuraciesmayresult.Wetashingorextract...
