Designation:D5672/D5672M−15StandardTestMethodforTestingFlexibleCellularMaterialsMeasurementofIndentationForceDeflectionUsinga25-mm[1-in.]DeflectionTechnique1ThisstandardisissuedunderthefixeddesignationD5672/D5672M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversascreeningtypequalitycontroltestusedtodetermineifflexiblepolyurethanefoamcushionsarewithinthespecifiedgraderangeforfirmness.1.2Thistestmethodislimitedtofoamswiththicknessesthatare75mm[3in.]orgreater.1.3ThistestmethodisbasedonthefactthatthetraditionalindustrystandardthicknessforIndentationForceDeflection(IFD)is100mm[4in.],andthetraditionalpercentdeflectionforIFDacceptanceandproductplanningis25%.Withrespect,then,tothesetraditionalindustryconventions,a25%deflec-tionona100-mm[4-in.]cushionwouldbe25mm[1in.].Thus,deflectingstandardcushions(ofproper100mmthick-ness)25mm[1in.]providesaquickwaytodetermineiftheflexiblepolyurethanefoamiswithinthespecifiedgraderangefor25%IFD.1.4Cushionthicknesseslessthan75mm[3in.]shallnotbetestedforIFDusingthistestmethod.1.5Thistestmethodisintendedtoprovideaquickandsimplemethodtoscreenflexiblepolyurethanefoamsfordeterminationofitsfirmnessgrade.1.6Units—ThevaluesstatedinU.S.CustomaryorSIunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThistestmethodandISO2439addressthesamesubjectmatter,butdifferintechnicalcontent.2.ReferencedDocuments2...
