ISO-PAS 18940-1 2025.docx

ISOPubliclyAvailableSpecificationISO/PAS18940-1Secondedition2025-05ImagingmaterialsImagepermanencespecificationofreflectionphotographicprintsforindoorapplications一Part1:TestmethodsMateriauxpourimageSpecificationrelativealapermanencedeimagedestiragesphotographiquesparreflexionpourapplicationsinterieuresPartie1:Methodesd,essaiReferencenumberISO/PAS18940-l:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+4122749Ol11Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv1 Scope12 Normativereferences13 Terms,definitionsandabbreviations23.1 Termsanddefinitions23.2 Abbreviations24 Requirements25 Testprocedures25.1 Outline25.2 Testtarget25.3 Lightstabilitytest45.4 Ozonegasstabilitytest45.5 Thermalstabilitytest45.6 Humidityfastnesstestinhighhumiditycondition46 Measurement47 Dataprocessingandgraphcreation57.1 Dataprocessing57.2 Calculationofcolourdifference57.3 Graphreporting67.3.1 General67.3.2 Lightstability77.3.3 Ozonegasstability87.3.4 Thermalstability97.3.5 Humidityfastnessinhighhumidityconditions108 Reporting118.1 Internalrecording118.2 Reportingforexternalcommunications12Bibliography14ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmentabinliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentshouldbenoted.ThisdocumentwasdraftedinaccordancewiththeeditorialrulesoftheISO/IECDirectives,Part2(seewww.iso.org/directives).ISOdrawsattentiontothepossibilitythattheimplementationofthisdocumentmayinvolvetheuseof（八）patent(三).ISOtakesnopositionconcerningtheevidence,validityorapplicabilityofanyclaimedpatentrightsinrespectthereof.Asofthedateofpublicationofthisdocument,ISOhadnotreceivednoticeof（八）patent(三)whichmayberequiredtoimplementthisdocument.However,implementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatwww.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTo)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW.isoQrgisoforeword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC42,Photography.Thissecondeditioncancelsandreplacesthefirstedition(ISO/PAS18940-1:2023),whichhasbeentechnicallyrevised.Themainchangesareasfollows:一editorialmodificationsforclarificationbasedonthecommentsontheDPASofthefirstedition.AlistofallpartsintheISO18940seriescanbefoundontheISOwebsite.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.Acompletelistingofthesebodiescanbefoundatwww.iso.org/membnrs.htmLIntroductionTestmethodsformeasurementoftheimagepermanenceforfourimportantenvironmentalstressfactorsforindooruseofphotographsaredescribedinthefollowingInternationalStandards:一ISO18936forthermalstability;一ISO18937(allparts)forlightstability;一ISO18941forozonegasstability;一ISO18946forhumidityfastness;ISO18949forlowhumiditytesting.HumiditytestingaccordingtoISO18946specifieshighhumiditytestconditionstotestforimagefastness(resistancetocolorantmigration).HumiditytestingaccordingtoISO18949specifieslowhumiditytestconditions,whichcanbeobservedinhotaridclimatesandduringwinterincontinentalclimates.Theimportanceoflowhumiditydependsontheenvironmentalconditionsofthespecificusagecase.TestingaccordingtoISO18949isoptional.NOTEItisacknowledgedthatotherenvironmentalstressfactorscanbepresentduringindooruseofphotographsthanthefourmentionedbefore.Examplesareotheratmosphericgases,includingSOandNO,thepresenceofwhichdependsonlocalfactorssuchastraffic,industryandheating.Mec