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MIL-C-675C22August1980SUPERSEDINGMIL-C-675A6January1964MIL-C-00675B(MU)22January1976MILITARYSPECIFICATIONCOATINGOFGLASSOPTICALELEMENTS(ANTI-REFLECTION)ThisspecificationisapprovedforusebyallDepartmentsandAgenciesoftheDepartmentofDefense.1.SCOPE1.1Scope.Thisspecificationestablishestheminimumopticalanddurabilityrequirementsformagnesiumfluorideinterferencefilmsusedasanti-reflectioncoatingsonopticalmaterials.2.APPLICABLEDOCUMENTS2.1Thefollowingdocuments,oftheissueineffectondateofinvi-tationforbidsorrequestforproposal,formapartofthisspecificationtotheextentspecifiedherein:SPECIFICATIONSFederalL-T-90CCC-C-440MilitaryMIL-E-12397MIL-O-13830MIL-I-45607Tape,Pressure-SensitiveAdhesiveCellophaneandCelluloseAcetateCloth,Cheesecloth,CottonBleachandUnbleachedEraser,Rubber-PumiceforTestingCoatedOpticalElementsOpticalComponentsforFireControlInstruments;GeneralSpecificationGoverningtheManufacture,AssemblyandInspectionofInspectionEquipme(,t,Acquisition,MaintenanceandDispositionofBeneficialcomments(recommendations,additions,deletions),andanypertinentdatawhichmaybeofuseinimprovingthisdocument,shouldbeaddressedto:Commander,USArmyArmamentResearchandDevelopmentCommand,ATTN:DRDAR-TST-S,Dover,NewJersey07801,byusingtheself-addressedStandardizationDocumentImprovementProposal(DDForm1426),appearingattheendofthisdocument,orbyletter.FSC-6650MIL-C-675CSTANDARDSMilitaryMIL-STD-105SamplingProcedureandTablesforInspectionbyAttributesMIL-STD-109QualityAssuranceTermsandDefinitionsMIL-STD-1241OpticalTermsandDefinitionsDRAWINGSU.S.ArmyArmamentCommandC7641866SurfaceQualityComparisonStandardsD7680600CoatingQualityComparisonStandardsD7608606Coating,EraserAbraslimTester(Copiesofspecifications,standards,drawingsandpublicationsrequiredbysuppliersinconnectionwithspecificprocurementfunctionsshouldbeobtainedfromtheprocuringactivityorasdirectedbythecontractingofficer.).‘t’-2.2Otherpublication.:Thefollowingjdocu~ntformsapartof-...-.-thisspecificationtothe~xtentspecified-herein=Unlessotherwisein-dicated,theissueineffectondateofinvitationforbidsorrequestforproposalshallapply:”AMERICANSOCIETYFORTESTINGANDMATERIALS(ASTM)ASTMBl17-73-StandardMethodofSaltSpray(fog)Testing(Applicationsforcopies‘shouldbeadd;essedtotheAmericanSocietyforTestingandMaterials,1916Race,Street,,.Philadelphia,PA,19103.Tech-nicalsocietyandtechnicalassociationspecificationsandstandardsaregenerallyavailableforreferencefromlibraries.Theyarealsodis-tributedamongtechnicalgroupsandusingFederalAgencies.)3.REQUIREMENTS3.1Opticaltermsanddefinitions.-TermsanddefinitionspeculiartothegeneralfieldofopticsasusedhereinaredefinedinMIL-STD-1241andSection6.3ofthisspecification.3.2Materials.-ThematerialusedforcoatingshallbeapuregradeofMagnesiumFluorideadequatetomeetallrequirementsofthisspecifi-cation.,/-)3.3Coatedarea.-Opticalcomponentsshallbecoatedovertheiren-tireclearaperture.Inthoseinstanceswheretheclearapertureisnotspecifiedonthecomponentdrawingorprocurementdocumentthefollowingallowableuncoatedholdingareashallapply:MIL-C-675CDiameterorMaximumDiagonalDimensionofODticalElementMaximumWidthofUncoatedAreaupto2“Greaterthan2“0.040”0.040”plusadditionalwidthof0.015”foreachinchindiagonalgreaterthan2“ORORUpto5CM1MMGreaterthan5CM1MMplusadditionalwidthincreasingattherateof0.15MMforeachCMover5CMInthoseinstanceswheretheclearapertureisspecified,areasoutsidetheclearaperturemaybecoatedatthediscretionofthecontractor.3.4Coatingquality.-Thecoatingshallbeuniforminqualityandconditionandshallconformtothefollowing:3.4.1Physical.-Thecoatingshallshownoevidenceofdeterioration....-suchasflaking,peeling,crackingorblistering.3.4.2Cosmetic.-Nostains,smears,streaks,orcloudinessshallbepermittedonopticalcomponentslyinginafocalplanebeyondthoseper-mittedbythecomponentdrawing.Unlessotherwfsespecifiedonthecom-ponentdrawingorprocurementdocument,visualdiscolorationssuchasstains,smears,streaks,cloudiness,etc.onopticalcomponentswhichlieoutsideafocalplaneinanopticalsystemshallbeacceptablewhenthestainedareaofthecoatedcomponentconformstothefollowing:a.Thetransmissionand/orreflectionrequirementsof3.5and3.7.b.Theadhesionrequirementof3.8.5.c.Thesevereabrasionresistancerequirement20f3.8.4.1forsubstrateshavingaKnoophardnessgreaterthan450kg/mm;ortheabra-sionresistancerequirement9f3.8.4.2forsubstrateshavingaKnoophardnesslessthan450kg/mm.NOTE:Forpurposesofthisspecification,shouldaquestionariseastowhetheranopticalcomponentliesatoroutsidethefocalplane,itwillbeassumedthatitliesatthefocalplane.3.4.3Spatterandholes.-Coatingspatterandholesshallbecon-sideredasadigandshallnotexceedtheallowabledigsizeandqualitystatedonthecomponentdrawingorprocurementdocument.3.4.4Surfacedefects(scratchanddig).-Coatingscratchesanddigsshallnotexceedthevaluesspecifiedforthesubstrateonthecom-ponentdrawingorprocurementdocument.(k)dtingscratchesanddigsshall3MIL-C-675C3.5Transmission.-Theincreaseintransmissionofanelementaftercoatingatthewavelengththatcorrespondstoacoatingwithaquarterwaveopticalthickness(QWOT)(See6.3)shallbeequaltoorgreaterthanthevaluespecifiedinFigure1,asapplicabletothesubstr