Designation:D4942−11StandardTestMethodsforWaterPickupofLithographicPrintingInksandVehiclesinaLaboratoryMixer1ThisstandardisissuedunderthefixeddesignationD4942;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thesetestmethodscovertwoproceduresfordetermin-ingtheamountofwaterpickedupbylithographicprintinginksinalaboratorymixer.1.2TestMethodAcoverssingle-pointwaterpickup;TestMethodBcoverstherateofwaterpickup.Bothtestmethodsareapplicabletoanyprintinginkandvehicleintendedforthelithographicprintingprocess.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SummaryofTestMethods2.1Thesetestmethodsutilizealaboratorymixerforbeatingwaterorotheragreeduponfluidintothetestink.2.2Forsingle-pointwaterpickup(TestMethodA),50mLofwaterisnormallyaddedto50gofinkandmixedinfor5min.Thewaterpickedupisdeterminedfromvolumetricmeasurementsoffreewater.2.3Forrateofwaterpickup(TestMethodB),waterisaddedto50gofinkinincrementsof20mLandmixedinfor1minormoreoveracumulativetimeperiodtotaling10min.Thewatertakenupbytheinkaftereachmixingintervalisdeterminedgravimetrically.3.SignificanceandUse3.1Thelithographicprintingprocessrequiresthatsomedampeningsolutionbeemulsifiedintotheink.Thesetestmethodsprovidearapidmeansfordeterminingwaterpickupunderlaboratoryconditions.Testresultsmaybeusefulforspecificationacceptancebetweenthesupplierandthecus-tomer.3.2Inorderthatresultsbecomparable,thetestsmustberunatthesametemperatureandwiththesametypeandquantityofliquidaddedpriortomixing.3.3Theemulsionsobtainedinthesete...
