ISO 23649 2025.docx

InternationalStandardISO23649IULTCSIUC444Firstedition2025-02ChemicalsfortheleathertanningindustryDeterminationofcyclosiloxanesProduitschimiquespourindustriedutannageducuir一DeterminationdescyclosiloxanesReferencenumbersISO23649:2025(en)IULTCS/IUC444:2025(en)COPYRIGHTPROTECTEDDOCUMENT©ISO2025Allrightsreserved.Unlessotherwisespecified,orrequiredinthecontextofitsimplementation,nopartofthispublicationmaybereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orpostingontheinternetoranintranet,withoutpriorwrittenpermission.PermissioncanberequestedfromeitherISOattheaddressbeloworISO,smemberbodyinthecountryoftherequester.ISOcopyrightofficeCP401Ch.deBlandonnet8CH-1214Vernier,GenevaPhone:+4122749Ol11Email:copyrightiso.orgWebsite:www.iso.orgPublishedinSwitzerlandContentsPageForewordivIntroductionv1 Scope12 Normativereferences13 Termsanddefinitions14 Principle15 Apparatus16 Reagents27 Samplingandsamplepreparation38 Procedure38.1 Samplesolutionpreparation38.2 Liquid-liquidextraction38.3 Instrumentalanalysis49 Expressionofresults410 Precision411 Testreport4Annex A (informative)ChromatographicanalysisoperatingparametersforGC-MS6Annex B (informative)Precision:reliabilityofthemethod7Annex C (normative)Samplepreparationfornon-water-solublechemicals8Bibliography9ForewordISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies(ISOmemberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhastherighttoberepresentedonthatcommittee.Internationalorganizations,governmentalandnon-governmentatinliaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnicalCommission(IEC)onallmattersofelectrotechnicalstandardization.TheproceduresusedtodevelopthisdocumentandthoseintendedforitsfurthermaintenancearedescribedintheISO/IECDirectives,Part1.Inparticular,thedifferentapprovalcriterianeededforthedifferenttypesofISOdocumentsshouldbenoted.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.iso.org/iso/foreword.htmLIULTCS1originallyformedin1897,isaworld-wideorganizationofprofessionalleathersocietiestofurthertheadvancementofleatherscienceandtechnology.IULTCShasthreeCommissions,whichareresponsibleforestablishinginternationalmethodsforthesamplingandtestingofleather.ISOrecognizesIULTCSasaninternationalstandardizingbodyforthepreparationoftestmethodsforleather.ThisdocumentwaspreparedbytheChemicalTestCommissionoftheInternationalUnionofLeatherTechnologistsandChemistsSocieties(IUCCommission,IULTCS),incollaborationwiththeEuropeanCommitteeforStandardization(CEN)TechnicalCommitteeCEN/TC289,Leather,inaccordancewiththeAgreementontechnicalcooperationbetweenISOandCEN(ViennaAgreement).Anyfeedbackorquestionsonthisdocumentshouldbedirectedtotheuser'snationalstandardsbody.AcompletelistingofthesebodiescanbefoundatWWW.iso.org/members.html.IntroductionThisdocumentincludesaprocedureforanalysingcertaincyclosiloxanesusinggaschromatography(GC)withmassspectrometer(MS)equipment.WiththisanalyticalmethodOctamethylcyclotetrasiloxane(D4),decamethylcyclopentasiloxane(D5)anddodecamethylcyclohexasiloxane(D6)canbedetermined.Intheleatherindustrycyclosiloxanes(D4),(D5and(D6)areusedinthemanufactureofsilicone-basedwaterproofingfatliquorsandcanalsobeusedintheproductionofsilicone-basedfinishingchemicalsespeciallyashandlemodifiers.Atpresent,theofficialclassificationrecognisedintheEUisthefollowing. Octamethylcyclotetrasiloxane(D4isclassifiedaspersistent,bioaccumulativeandtoxic.t1l Decamethylcyclopentasiloxane(D5)isclassifiedaspersistent,bioaccumulativeandtoxic.H Dodecamethylcyclohexasiloxane(D6)isclassifiedaspersistent,bioaccumulativeandtoxic.BlInternationalStandardIS023649:2025(en)IULTCSIUC÷202S(en)ChemicalsfortheleathertanningindustryDeterminationofcy