Designation:D7734/D7734M−13(Reapproved2020)StandardTestMethodforDeterminationofOpenTimeofOxidativePrintingInksandOverprintVarnishesbyaManualMethod1ThisstandardisissuedunderthefixeddesignationD7734/D7734M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversamanualprocedurefordeter-miningthestayopentimeofoxidativedryingprintinginksandoverprintvarnishesbyafingertransfermethod.Openisdefinedasawetink/varnishfilm.1.2Theamountoftimerequiredtoreachtheendpointisrecordedinhours.1.3Typicalinksandoverprintvarnishesthatdrybyoxida-tionareoilbasedsheetfedoffset,letterpress,andscreeninks.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.SummaryofTestMethod2.1Inksandoverprintvarnishesareappliedtoaglasssurfaceusingawetfilmapplicatorandcheckedattimeintervalsusingafingertransfermethodtodeterminethetimethattheink/varnisharenolongeropen.3.SignificanceandUse3.1Whenformulatingprintinginksandoverprintvarnishesthatdryprimarilybyoxidationitisimportanttoknowthestayopentimesothatprematuredryingdoesn...
