Designation:D1652−11´1StandardTestMethodforEpoxyContentofEpoxyResins1ThisstandardisissuedunderthefixeddesignationD1652;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.´1NOTE—EditorialcorrectionsweremadethroughoutinMay2012.1.Scope*1.1Thistestmethodcoverstheprocedureformanualandautomatictitrationofepoxyresinsforthequantitativedeter-minationofthepercentepoxidecontentfrom0.1to26%epoxide.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection6.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater2.2OtherDocuments:OSHARegulations,29CFRparagraphs1910.1000and1910.120033.SummaryofTestMethod3.1Theresinisdissolvedinasuitablesolventandtheresultingsolutionistitratedwithhydrogenbromideeitherdirectlyorinsitu.Thehydrogenbromidereactsstoichiometri-callywithepoxygroupstoformbromohydrins;therefore,thequantityofacidconsumedisameasureoftheepoxycontent.3.1.1IntheManualTitrationMethod,thetitrationiswithstandardperchloricacidinthepresenceofanexcessoftetraethylammoniumbromide.Hydrogenbromidegeneratedinsitubytheadditionofperchloricacidtothequaternaryammoniumhaliderapidlyopenstheoxiranering.3.1.2IntheAutomaticTitrationMethod,thereactionismeasuringthemillivolt(MV)potentialasperchloricacidisadded,whichcombineswiththebromidetoformthehydro-bromicacid,whichreactswiththeepoxidegroup.Asthereactionprogresses,thepotentialwillgraduallyincreaseuntilthereactionnearscompletionatwhichp...
