Designation:D4953−15StandardTestMethodforVaporPressureofGasolineandGasoline-OxygenateBlends(DryMethod)1ThisstandardisissuedunderthefixeddesignationD4953;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversandisapplicabletogasolinesandgasoline-oxygenateblendswithavaporpressurerangefrom35kPato100kPa(5psito15psi)(seeNote2).Thistestmethod,amodificationofTestMethodD323(ReidMethod),providestwoprocedurestodeterminethevaporpressure(Note1)ofgasolineandgasoline-oxygenateblends.NOTE1—Becausetheexternalatmosphericpressureiscounteractedbytheatmosphericpressureinitiallypresentintheairchamber,thisvaporpressureisanabsolutepressureat37.8°C(100°F)inkilopascals(pounds-forcepersquareinch).Thisvaporpressurediffersfromthetruevaporpressureofthesampleduetosomesmallvaporizationofthesampleandairintheconfinedspace.NOTE2—Vaporpressureofgasolineorgasoline-oxygenateblendsbelow35kPa(5psi)orgreaterthan100kPa(15psi)canbedeterminedwiththistestmethodbuttheprecisionandbias(Section11)donotapply.Formaterialswithavaporpressuregreaterthan100kPa(15psi),usea0kPato200kPa(0psito30psi)gaugeasspecifiedintheannexofTestMethodD323.1.2Somegasoline-oxygenateblendsmayshowahazewhencooledto0°Cto1°C.Ifahazeisobservedin9.4,itshallbeindicatedinthereportingofresults.Theprecisionandbiasstatementsforhazysampleshavenotbeendetermined(seeNote7).1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Specificwarningsaregivenin7.5,8.4.1,8.5.1,9.1,A1.1,andA1.1.3.2.ReferencedDocuments2.1ASTMStandards:2D323Te...
