ASTM_D_4400_-_18.pdf

Designation:D440018Standard Test Method forSag Resistance of Paints Using a Multinotch Applicator1This standard is issued under the fixed designation D4400;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.This standard has been approved for use by agencies of the U.S.Department of Defense.INTRODUCTIONThe multinotch applicator used in this test method is a drawdown blade with a series of notches ofsuccessively higher clearance,referred to as the Anti-Sag Meter.See Fig.1 and Fig.2 for arepresentative diagram and photograph.The numerical value for sag resistance obtained with thisinstrument is referred to as the Anti-Sag Index.Anti-Sag Meters are made with several clearance ranges for different types of coatings(see 5.1 andTable 1).In developing this standard the task group used an instrument with a range from 4 to 24 mils,but the method is applicable to any clearance range,and results using instruments with overlappingranges correlate and have equal validity.The basic method was developed in 19622and is referenced in U.S.Federal specificationsTT-E-508,TT-E-506,and TT-P-1511.Apreshear program is essential for a drawdown sag test to duplicate the breakdown in structure thatoccurs when thixotropic paints are applied by brushout or other practical application methods.Theprocedures therefore include the preshearing of paints just prior to making test applications.1.Scope1.1 This test method covers the laboratory determination ofthe sag resistance of aqueous and nonaqueous liquid coatings atany level of sag resistance.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.NOTE1Because the only manufacturer of the applicator know to thecommittee manufactures to inch-pound units,inch-pound units will beregarded as the standard when referring to the applicator.1.3 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.1.4 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:3D2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer2.2 U.S.Federal Specifications:4Fed.Spec.TT-E-508 Alkyd semi-gloss enamelFed.Spec.TT-E-506 Alkyd gloss enamelFed.Spec.TT-P-1511 Interior latex gloss and semi-glossfinishes3.Summary of Test Method3.1 After preshearing,the coating is applied to a test chartwith a multinotch applicator.The charts are immediately hung1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Sept.15,2018.Published October 2018.Originallyapproved in 1984.Last previous edition approved in 2012 as D4400 99(2012)1.DOI:10.1520/D4400-18.2“Design of an Improved Sag Tester,”Offcial Digest,Vol 34,No.453,October1962.3For 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.4Available from DLA Document Services,Building 4/D,700 Robbins Ave.,Philadelphia,PA 19111-5094,http:/quicksearch.dla.mil.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.1 vertically with the drawdown stripes horizontal,similar torungs of a ladder,with the thinnest stripe at the top.Afterdrying in this position,the drawdown is examined and rated forsagging.A typical sag pattern obtained by this procedure isshown in Fig.3.4.Significance and Use4.1 Evaluation of sag resistance is essential in qualitycontrol for both producers and purchasers of coatings.Practicalapplication tests are poor in re