Designation:E2786−10(Reapproved2015)StandardTestMethodsforMeasuringExpansionofIntumescentMaterialsUsedinFirestopandJointSystems1ThisstandardisissuedunderthefixeddesignationE2786;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodsdetermine,bymeasurement,theexpansionofintumescentmaterialsusedinfirestopandjointsystemsunderspecifiedconditions.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thetextofthesetestmethodsreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthefiretestresponsestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E176TerminologyofFireStandardsE631TerminologyofBuildingConstructions3.Terminology3.1Definitions—Definitionsinthefollowingstandardswillprevailfortermsnotdefinedinthesetestmethods.3.1.1Fordefinitionsofgeneraltermsusedinthesetestmethodsrelatedtobuildingconstruction,refertoTerminologyE631.3.1.2Fordefinitionsofgeneraltermsusedinthesetestmethodsrelatedtofirestandards,refertoTerminologyE176.3.2DefinitionsofTermsSpecifictoThisStandard:3.3expansion,n—anincreaseinthedimensionsastheresultofheating.3.4expansionfactor,n—theratioofthematerialheightbeforeandafterheating,undertestconditionsthatallowexpansiononlyintheverticaldirection.3.5intumescent,adj—characterizedbyswellingwhenex-posedtohighsurfacetemperaturesorflames.4.SummaryofTestMethod4.1Thesetest...
