Designation:B926−09StandardMethodforPinholeDeterminationinAluminumandAluminumAlloyPlainFoilbyMeansofaLightTable1ThisstandardisissuedunderthefixeddesignationB926;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thismethodcoverstheidentificationandcountingofpinholes,includingrollholes,inplainfoilusingalighttable,andinspectorwithnormal20/20orcorrected20/20vision,andadarkenedinspectionarea.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thismethodmayinvolvehazardousmaterials,operations,andequipment.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B881TerminologyRelatingtoAluminum-andMagnesium-AlloyProducts3.Terminology3.1Definitions—RefertoTerminologyB881fordefinitionsofproducttermsusedinthisspecification.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1calibration—determinationofthevaluesofthesig-nificantparameter(s)bycomparisonwithavalue(s)indicatedbyareferenceinstrumentorbyasetofreferencestandards.3.2.2pinhole—anysmallvoidinthefoilthatwillpermitthetransmissionoflight.Classificationcriteriaforpinholeslimitsthesevoidstothosethataretoosmallinsizetobeclearlyvisibletotheunaidedeye(1×visualinspection).3.2.3rollhole—theproducer’sclassificationofapinholecausedbyanimperfectiononanytypeofrollthefoilcontactsduringproduction.Thedistinguishingfeatureofarollhole(s)istherepeatabilityofthisvoidonaregularinterval.Thisintervalisdirectlyproportionaltothecircumferenceoftherollcausingthevoid(thisinterva...
