Designation:D3746/D3746M−85(Reapproved2022)StandardTestMethodforImpactResistanceofBituminousRoofingSystems1ThisstandardisissuedunderthefixeddesignationD3746/D3746M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheresis-tanceofbituminousroofingsystemstoimpactloadsatanydesiredtemperature,withamissileoftheweight,size,andshapespecifiedherein.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Forspecificprecautionarystatements,seeSection6.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2829/D2829MPracticeforSamplingandAnalysisofEx-istingBuilt-UpRoofSystems3.SummaryofTestMethod3.1Thistestmethodsubjects305by305-mm[12by12-in.]specimensofaroofingsystem(insulationandmembranecompletewithtopsurfacing)toaseriesoffourimpacts,oneineachquadrant,fromastandardmissilefallingfreelyfromapredeterminedheightwithanimpactenergyof30.0J[22lbf·ft].Damagetothemembraneisassessedbyvisualexaminationofthefeltsaftersolventextractionofthebitumen.3.2Theeffectofspecimentemperatureonimpactresistancecanbestudie...
