Designation:B588−88(Reapproved2010)StandardTestMethodforMeasurementofThicknessofTransparentorOpaqueCoatingsbyDouble-BeamInterferenceMicroscopeTechnique1ThisstandardisissuedunderthefixeddesignationB588;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthethick-nessoftransparentmetaloxideandmetalliccoatingsbyutilizingadouble-beaminterferencemicroscope.21.2Thetestmethodrequiresthatthespecimensurfaceorsurfacesbesufficientlymirrorliketoformrecognizablefringes.1.3Thistestmethodcanbeusednondestructivelytomea-sure1to10µmthicktransparentcoatings,suchasanodiccoatingsonaluminum.Thetestmethodisuseddestructivelyfor0.1to10µmthickopaquecoatingsbystrippingaportionofthecoatingandmeasuringthestepheightbetweenthecoatingandtheexposedsubstrate.Thestrippingmethodcanalsobeusedtomeasure0.2to10µmthickanodiccoatingsonaluminum.1.4Thetestmethodisusableasareferencemethodforthemeasurementofthethicknessoftheanodicfilmonaluminumorofmetalliccoatingswhenthetechniqueincludescompletestrippingofaportionofthecoatingwithoutattackofthesubstrate.Foranodicfilmsonaluminum,thethicknessmustbegreaterthan0.4µm;theuncertaintycanbeasgreatas0.2µm.Formetalliccoatings,thethicknessmustbegreaterthan0.25µm;theuncertaintycanbeasgreatas0.1µm.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3B504TestMethodforMeasurementofThicknessofMetal-licCoatingsbytheCoulometricMethod3.SummaryofTestMethod3.1Whileobservingthespecimensurfacethroughthe...
