Designation:D4846−96(Reapproved2021)StandardTestMethodforResistancetoUnsnappingofSnapFasteners1ThisstandardisissuedunderthefixeddesignationD4846;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheforcerequiredtodisengagesnapfastenersbyapullperpendiculartoandparallelwiththeplaneofthesnapfastener.1.2Thistestmethodrequiresattachmentofsnapstospeci-mensusingspecificationsprovidedbytheproducersofthesnaps.1.3Thistestmethodisusedtoestablishcorrelationtowearconditionsandforcomparingdifferentbrandsandtypesofsnapfasteners.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D76/D76MSpecificationforTensileTestingMachinesforTextilesD123TerminologyRelatingtoTextilesD1776/D1776MPracticeforConditioningandTestingTex-tiles3.Definitions3.1lateralholdingstrength,n—theforcerequiredtodisen-gageasnapfastenerresultingfromapullintheplaneparalleltothematerialtowhichthesnapfastenerisattached.3.2snapaction,n—theforcerequiredtodisengageasnapfastenerresultingfromapullexertedperpendiculartotheplaneofmaterialtowhichthesnapfastenerisattached.3.3snapfastener,n—adeviceforattach...
