Designation:F2496−05(Reapproved2011)´1StandardPracticeforDeterminingtheScratchHardnessandScrapeAdhesionofPrintsandCoatings1ThisstandardisissuedunderthefixeddesignationF2496;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.´1NOTE—RevisedtheunitspresentationandaddedaunitsstatementeditoriallyinOctober2011.1.Scope1.1Thispracticedescribesprocedurestoobtainsubjective,butcomparativedataforscratchhardnessandscrapeadhesionofcoatingsandcolorimagesproducedbyprinters,copiesandotherreprographicdevices.1.2Thismethodsimulatesconditionswherethesurfaceofvarioussubstratessuchaspaper,film,cloth,andsoforthmaybesubjecttofailureundermechanicalforce.1.3Thistestmethodcoversthedeterminationofthescratchhardnessandscrapeadhesionofcoatings.Resultsareex-pressedintermsofforce-toscratchcoatingsonsubstratesusedinprinting.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.Terminology2.1Definitions:2.1.1scratchhardness—theforcenecessarytocutthroughthecoatingtothesubstrate.2.1.2scrapeadhesion–scratchresistance—theforcere-quiredtoscrapeapaththroughthecoatingorprint,whenthestylusbeginsitsmotion.Bymovingafreeedgeofthetestcoatingagainstaroundstylusorloopunderavariableloadexpressedingrams,scraperesistanceisdeterminedastheminimumloadingramsrequiredtocutthroughthefilmtothesubstrate.3.SummaryofPractice3.1Thescratchhardnessandscrapeadhesionisdeterminedbypushingthesubstratewithcoatingbeneatharoundedstylusorloopthatisloadedinin...
