ASTM_D_6887_-_03_2020.pdf

Designation:D688703(Reapproved 2020)Standard Test Method forTesting Alkyd Compatibility with Resin or Resin Solutions1This standard is issued under the fixed designation D6887;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.Scope1.1 This test method covers the procedure for determiningthe degree of compatibility of an alkyd with a specific resin orresin solution.1.2 The most common use of this method is to test alkydcompatibility with a hydrocarbon resin or a solution of theresin in an aliphatic solvent,for lithographic ink vehicleapplications.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D6038 Test Methods for Determining the Compatibility ofResin/Solvent Mixtures by Precipitation Temperature(Cloud Point)3.Terminology3.1 Definitions:3.1.1 compatibility,nresin and solvent mixture forms aclear,homogenous,and stable solution.D60383.1.2 incompatibility,nresin and solvent mixture does notform a clear,homogenous,and stable solution.4.Summary of Test Method4.1 The required resin to alkyd ratio is mixed into a 150-mLbeaker and heated to 160C until clear and homogenous.4.2 The solution is placed into pre-labeled jars and cooled.4.3 Degree of compatibility is reported at 30 min and 24 hafter cooling to room temperature.5.Significance and Use5.1 Incompatibility of the system can lead to loss of gloss,decreased color strength,rheological problems and grind issuesin the flush or pigment base.5.2 This method is used in the lithographic industry,espe-cially in pigment wetting applications,where the alkyd may ormay not be totally compatible with the resin selected for theapplication.6.Apparatus6.1 Beakers,150 mL(4).6.2 Jars,with lids,4 oz(4).6.3 Balance,capacity of at least 200 g,accurate to 60.1 g.6.4 Hot Plate,capable of heating to a minimum of 200C.6.5 Thermometer,0 to 200C,61C.6.6 Spatula,or stirrer rods.7.Test Samples7.1 Alkyd to be tested.7.2 Resin or resin solution.8.Procedure8.1 Label each jar and beaker with the resin,alkyd and ratiobeing tested.8.2 Weigh into the beaker the following materials:MaterialRatio2:13:14:15:1Resin/Resin Solution16.0g18.0g20.0g20.0gAlkyd8.0g6.0g5.0g4.0g8.3 Place the beakers on the hot plate and heat to 160C.Stirwith spatula or stir rod until clear.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.37 on Ink Vehicles.Current edition approved June 1,2020.Published July 2020.Originally approvedin 2003.Last previous edition approved in 2013 as D6887 03(2013).DOI:1520/D6887-03R20.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.8.4 Pour the blend from each beaker into the appropriatelylabeled jar then cool to room temperature.8.5 Wait 30 min then visually observe degree of clarity ofeach test sample.NOTE1Some applications may require a longer waiting time such as24 h.If this is the case,record compatibility of the solution after 24 h.9.Report9.1 Report the highest ratio where the blend remained clearafter 30 min or 24 h(time should be agreed upon by user of thistest method and application).9.2 If the mixtures are clear at all ratios tested,then the resincan be considered compatible to the highest ratio tested.10.Precision and Bias310.1 An inter-laboratory study was conducted in which sixlaboratories tested the compatibility of two hydrocarbon resinswith two alkyds.All laboratories agreed on the compatibility/inco