Designation:F548−09(Reapproved2014)StandardTestMethodforIntensityofScratchesonAerospaceTransparentPlastics1ThisstandardisissuedunderthefixeddesignationF548;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthevisualinspectionofshalloworsuperficialscratchesonthesurfaceofaerospacetransparentplasticmaterials.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2F428TestMethodforIntensityofScratchesonAerospaceGlassEnclosures3.SummaryofTestMethod3.1Avisualcomparisonismadebetweenasetofgradedscratchstandardsandthescratchontheplasticmaterialtodeterminetherelativeintensityofthescratch.4.SignificanceandUse4.1Scratchesexistonalltransparentplasticsurfaces.Usu-allytheyareveryfinescratchesfromcleaningoperationsthatarenotvisiblewhenlookingthroughtheplastic.Deeperscratchesmayresultfromcarelesscleaningorhandling.Whilethesemaynotbedeepenoughtoaffectthestructuralintegrityofthepart,theirappearanceincertainlocationsmaybedistractingtotheobserverlookingthroughtheplastic.Therefore,aproceduretodefinethesescratchesisuseful.5.ReferenceMaterialsNOTE1—Adjunctsforscratchesonplasticarenotcurrentlyavailable.However,adjunctsareavailableforscratchesonglasssurfacesandastudyhasbeendonetoequatethetwo(seetheAppendix).RefertoF428forsourcesoftheglassadjuncts.6.Procedure6.1Placethepartinasuitableinspectionposition.Thismaybehorizontalonapaddedtable,verticalagainstaneutralbackground,oratanangle.Thescratchedsurfaceshallbetowardtheobserver.Thelightlevelshallbeaminimumof80lux.Eithernaturalorartificiallightmaybeused.PlacethescratchintheASTMcomparisonst...
