ISO 15715 2025.docx

ISOInternationalStandardISO15715Secondedition2025-06Bindersforpaintsandvarnishes一DeterminationofturbidityLiantspourpeinturesetvernisDeterminationdeIaturbiditeReferencenumberISO15715:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+41227490111Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv2 Normativereferences13 Termsanddefinitions14 Principle14.1 Principleofthemethod14.2 2GeneralprinciplesOftUrbiditymeaSUrement15 Apparatus25.1 Turbidimeter26 Calibration37 Procedure38 Expressionofresults49 Precision410 Testreport4Annex A (normative)Preparationofformazinstandards5Annex B (informative)Useofadditionalmeasurementangles6Bibliography7ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmental,inliaisonwithISO,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.HoweverlImplementersarecautionedthatthismaynotrepresentthelatestinformation,whichmaybeobtainedfromthepatentdatabaseavailableatWWW.iso.org/patents.ISOshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.Anytradenameusedinthisdocumentisinformationgivenfortheconvenienceofusersanddoesnotconstituteanendorsement.Foranexplanationofthevoluntarynatureofstandards,themeaningofISOspecifictermsandexpressionsrelatedtoconformityassessment,aswellasinformationaboutISO'sadherencetotheWorldTradeOrganization(WTO)principlesintheTechnicalBarrierstoTrade(TBT),seeWWW.iso.org/iso/foreword.htmLThisdocumentwaspreparedbyTechnicalCommitteeISO/TC35,Paintsandvarnishes,incollaborationwiththeEuropeanCommitteeforStandardization(CEN)TechnicalCommitteeCEN/TC139,Paintsandvarnishes,inaccordancewiththeAgreementontechnicalcooperationbetweenISOandCEN(ViennaAgreement).Thissecondeditioncancelsandreplacesthefirstedition(ISO15715:2003),whichhasbeentechnicallyrevised.Themainchangesareasfollows: CIaUSe2hasbeenadded; theprinciple(new4.1)hasbeenamendedbyadescriptionofinfluenceswhichcanaffectturbiditymeasurements; formazinturbidityunits(FTU)hasbeenchangedtoformazinnephelometricunits(FNU),tobeinlinewithISO7027-1:2016; theopticalpathlengthofthetubehasbeenchangedin5.2; inClause6tareferencetocommerciallyavailablecalibrationstandardshasbeenaddedaswellasareferencetoroomtemperatureforstoringthecalibrationstandards; areferencetoISO7027-1hasbeenaddedforprecision; theexpressionofresultsinClaUSn8hasbeenreducedtothreeclasses,i.e.theformerclasses10FNUtolessthan100FNUandgreaterorequalto100FNUhavebeencombinedtooneclass,toreporttheresulttothenearest1FNU; thenormativereferenceshavebeenupdated.Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.iso.org/members.htmLIntroductionThemeasurementoftheturbidityofliquidscanbecarriedoutvisuallyorusinganinstrument,butvisualmethodscanbesubjective.Thismethodinstrumentallymeasuresthescatteringoflightbytheinsolublematterinaliquidandthereforegivesanobjectivedeterminationofturbidity.Turbidityinliquidsiscausedbythepresenceofundissolvedmatter(i.e.non-settlingflocculation,gelsorothersuspendedmattersuchasparticlesordroplets).Inthecaseoffinelydispersedundissolvedmatter,theturbiditycanbedeterminedbymeasuringtheintensityofthelightwhichisscatteredbytheparticleswhenabeamoflightispassedthroughtheliquid.BindersforpaintsandvarnishesDeterminationofturbidity1ScopeThisdocumentspecifiesaninstru