Designation:D4846−96(Reapproved2011)StandardTestMethodforResistancetoUnsnappingofSnapFasteners1ThisstandardisissuedunderthefixeddesignationD4846;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheforcerequiredtodisengagesnapfastenersbyapullperpendiculartoandparallelwiththeplaneofthesnapfastener.1.2Thistestmethodrequiresattachmentofsnapstospeci-mensusingspecificationsprovidedbytheproducersofthesnaps.1.3Thistestmethodisusedtoestablishcorrelationtowearconditionsandforcomparingdifferentbrandsandtypesofsnapfasteners.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesstatedintheparenthesesareforinforma-tiononly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D76SpecificationforTensileTestingMachinesforTextilesD123TerminologyRelatingtoTextilesD1776PracticeforConditioningandTestingTextiles3.Definitions3.1lateralholdingstrength,n—theforcerequiredtodisen-gageasnapfastenerresultingfromapullintheplaneparalleltothematerialtowhichthesnapfastenerisattached.3.2snapaction,n—theforcerequiredtodisengageasnapfastenerresultingfromapullexertedperpendiculartotheplaneofmaterialtowhichthesnapfastenerisattached.3.3snapfastener,n—adeviceforattachingonematerialtoanotherconsistingofmatchingmaleandfemaleparts,eachofwhichisattachedtoaseparatematerialsothatthepartscanbejoinedbyalowcompressiveforceandseparatedbyalowperpendiculartensileforce.3.4Fordefinitionsofothertextiletermsusedinthistestmethod,refertoTerminologyD123.4.SummaryofTestMethod4.1Snapfastenersmountedonstripsofmaterialneartheendaretest...
