Designation:D1825–03AnAmericanNationalStandardStandardPracticeforEtchingandCleaningCopper-CladElectricalInsulatingMaterialsandThermosettingLaminatesforElectricalTesting1ThisstandardisissuedunderthefixeddesignationD1825;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticedescribesaprocedureforetchingandcleaningcopper-cladelectricalinsulatingmaterialsandther-mosettinglaminatesforelectricaltesting.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecificwarningstatementssee6.3and6.4.2.ReferencedDocuments2.1ASTMStandards:2D1867SpecificationforCopper-CladThermosettingLami-natesforPrintedWiring3.SignificanceandUse3.1Theprocedureusedforetchingthecopperfoilfromthebaseinsulatingmaterialsmaysignificantlyaffecttheresultsofelectricaltests.Thisistrueprimarilyfortworeasons.First,thegeometryofthecopperwhichremainsandformstheelectrodesisinpartdeterminedbytheetchingprocedure;thisisparticu-larlytrueofcloselyspacedelectrodesonthesamesurfacewhenthepropertytobemeasureddependsontheelectrodegeometry.Second,electricalconductanceinthematerial,particularlysurfaceconductance,maybeaffectedbythechemicalsusedtoetchthecopper,thelengthoftimeofetching,andthemannerinwhichthespecimeniscleanedafteretching.3.2Thispracticestandardizestheetchingprocedureinordertoprovideabasisforcomparisonofelectricalpropertiesofcopper-cladelectricalinsulatingmaterialsandthermosettinglaminates.Experiencehasshownthatthetestcircuitcanbeaccuratelypreparedusingthisprocedure,andthatthespecimenwillbesubstantiallyfreeofetching-induced,electrically-conductivecontaminants.3.3Itisrecognizedthatcommercialprocessesu...
