Designation:B762−90(Reapproved2016)StandardTestMethodofVariablesSamplingofMetallicandInorganicCoatings1ThisstandardisissuedunderthefixeddesignationB762;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodprovidessamplingplansthatareintendedforuseintheinspectionofmetallicandinorganiccoatingsonproductsforthepurposeofdecidingwhethersubmittedlotsofcoatedproductscomplywiththespecifica-tionsapplicabletothecoating.1.2Thesamplingplansarevariablesplans.Inplansofthistype,severalarticlesofproductaredrawnfromaproductionlot.Acharacteristicofthecoatingonthedrawnarticlesismeasured.Thevaluesobtainedareusedtoestimatethenumberofarticlesinthelotthatdonotconformtoanumericallimit,forexampleaminimumthickness.Thenumberiscomparedtoamaximumallowable.1.3Variablesplanscanonlybeusedwhenthecharacteristicofinterestismeasurable,thetestmethodgivesanumericalmeasureofthecharacteristic,andthespecificationplacesanumericallimitonthemeasuredvalue.Itisalsonecessarythatthevariationofthecharacteristicfromarticletoarticleinaproductionlotbenormallydistributed(seeAppendixX2).Eacharticlemustbetestedinthesameway(forexample,coatingthicknessmustbemeasuredatthesamelocation,seeX2.7)sothatthevaluesfromarticletoarticlearecomparable.Ifoneormoreoftheseconditionsarenotmet,avariablesplancannotbeused.Instead,anattributesplanmustbeused.ThesearegiveninTestMethodB602andGuideB697.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B602TestMethodforAttributeSamplingofMetallicandInorganicCoatingsB697GuideforSelectionofSamplingPlansforInspectionofElectrodepositedMetallicandIn...
