ASTM_D_6038_-_14.pdf

Designation:D603814Standard Test Methods forDetermining the Compatibility of Resin/Solvent Mixtures byPrecipitation Temperature(Cloud Point)1This standard is issued under the fixed designation D6038;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 These test methods cover the manual and automaticprocedures for testing the compatibility of lithographic inkresins in high boiling ink solvents by precipitation temperature(cloud point)in a range from 35 to 210C.1.2 The manual procedure in this test method uses labora-tory equipment generally available in a normal,well-equippedlaboratory.The automated procedure uses a programmablecloudpoint tester.1.3 This test method is for use with ink resins intendedmainly for oil-based offset and letterpress inks.The type ofresins are typically,but not limited to C9aromatic hydrocarbonresins,modified dicyclopentadiene resins,rosin pentaerythritolor glycerol esters,phenolic modified rosin esters,maleicanhydride modified-rosin esters,and naturally occurring resinssuch as gilsonite.1.4 A resin solution or ink vehicle could also be used in thistest instead of the resin.1.5 The typical high boiling solvents to be used are C12toC16petroleum distillates.1.6 To avoid fire or injury,or both,to the operator,this testmethod should not be used with low flash point solvents suchas toluene or xylene.The minimum flash point of the solventsused should be 60C as determined by Test Method D56.NOTE1Users of this test method should be aware that the flash pointof many solvents used for this test(as defined in Test Methods D56 andD1310)is exceeded in the heating cycle of this test method.Safetyprecautions should be taken since there is the potential for vapor ignition.The method outlined should be done in a shielded exhaust hood,wherethere is access to a fire extinguisher if needed.1.7 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D56 Test Method for Flash Point by Tag Closed Cup TesterD1310 Test Method for Flash Point and Fire Point of Liquidsby Tag Open-Cup ApparatusE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions:3.1.1 cloud point,n(precipitation temperature)the tem-perature at which a resin/solvent mixture changes from clear toturbid and opaque.3.1.2 compatibility,nresin and solvent mixture forms aclear,homogeneous,and stable solution at room temperature.3.1.3 incompatibility,nresin and solvent mixture does notform a uniform solution and may be in two phases or opaque.3.1.4 precipitation,nresin separates from the resin/solventmixture.3.1.5 solubility,nthe degree of resin compatibility in agiven solution.4.Summary of Test Method4.1 A 10%by weight mixture of the resin(or ink vehicle)to be tested in the reference solvent(or vice versa)is heated ina test tube and stirred until a clear solution is obtained.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.37 on Ink Vehicles.Current edition approved Jan.1,2014.Published January 2014.Originallyapproved in 1996.Last previous edition approved in 2005 as D6038 051.DOI:10.1520/D6038-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2 The solution is allowed to cool.The cloud point is thelowest temperature that can be read on a thermometer,posi-tioned at the back wall of the test tube,or in the case of theautomated tester,before the solution reaches the preset turbid-ity level.4.3 If the solution remains clear at room temperature,thetest tube is cooled(cold water,ice water,or dry ice/acetonebath)until the cloud point can be recorded.(Cooling belowambient temperature can only be done in the manual method.)5.Significance and Use5.1 These te