ASTM_D_869_-_21.pdf

Designation:D86921Standard Test Method forEvaluating Degree of Settling of Paint1This standard is issued under the fixed designation D869;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.1.Scope1.1 This test method covers the determination of the degreeof pigment suspension and ease of remixing a shelf-agedsample of paint to a homogeneous condition suitable for theintended use.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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Documents2.1 ASTM Standards:2D1309 Test Method for Settling Properties of Traffic PaintsDuring Storage(Withdrawn 2020)33.Significance and Use3.1 Paints,if not formulated or processed properly maysettle excessively.Paint that settles excessively is difficult toreincorporate into the paint system causing time delays orvaluable pigment being left in the drum.This test method is anattempt to evaluate the degree of settling caused by theaccelerated Test Method D1309.This very subjective methodof evaluation in conjunction with the variables of Test MethodD1309 raises questions as to the usefulness of the results forspecification compliance.4.Apparatus4.1 Container,standard 500-mL(1-pt)friction-top can paintcontainer,85.5 6 1.5 mm(3386116in.)in diameter,and 98.56 1.5 mm(3786116in.)in height.4.2 Spatula,stainless-steel blade with a handle with a127 mm(5 in.)long blade and approximately 20 mm(1316in.)in width.Approximately 2 mm of the end shall be cut off suchthat the end is square.For comparative testing it is recom-mended to use the indicated spatula parameters as variancesmay show different results.Other specifications may be accept-able and should be decided on between purchaser and seller.5.Procedure5.1 Place the specimen to be tested for pigment suspensionin a 500-mL(1-pt)container,filling the can to within 13 mm(12in.)of the top.Close the can tightly and hold undisturbedfor shelf aging for 6 months or for such other periods of timeagreed upon between the purchaser and the seller.5.2 Open the can holding the shelf-aged sample withoutshaking or agitation,and examine the sample without removalof supernatant vehicle.Use the spatula to determine the extentand character of portions of the paint that may have separatedduring storage.Hold the spatula perpendicular to and in thecenter area of the paint at a height whereby the bottom edge ofthe spatula is level with the top of the can.Drop the spatulafrom that position.Rate the condition of the sample inaccordance with 5.4.5.3 After examination of the entire specimen as described in5.2,if a portion of the pigment has separated out to form a firmcake at the bottom of the container pour the supernatant portionof the liquid off into a clean container and hold for subsequentuse.Reincorporate the separate cake by hand stirring with thespatula,adding back the liquid in small amounts until thepigment has been reincorporated to form a homogeneous paintsuitable for the intended use or until it is determined that thepigment cake cannot be reincorporated by hand stirring.Ratethe condition of the specimen in accordance with 5.4.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints&Paint Materials.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 1946.Last previous edition approved in 2015 as D869 85(2015).DOI:10.1520/D0869-21.2For 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.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 standardizat