ASTM_D_3925_-_02_2015.pdf

Designation:D392502(Reapproved 2015)Standard Practice forSampling Liquid Paints and Related Pigmented Coatings1This standard is issued under the fixed designation D3925;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 practice describes methods of taking representativesamples of fluid paint or pigmented coating products fromcontainers of any type.1.2 Two ISO standards,ISO 1513 and ISO 15528,cover thedetails and equipment for sampling of liquid paints andassociated materials in much greater detail than this standard.The reader is referred to those standards for more information.1.3 The sampling of dry powder paints,clear coatings,mixed solvents,and nonpigmented materials of any type is notcovered in this procedure.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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:2D1475 Test Method For Density of Liquid Coatings,Inks,and Related Products2.2 ISO Documents:ISO 1513 Paints and varnishesExamination and prepara-tion of samples for testing3ISO 15528 Paints,varnishes and raw materials for paints andvarnishesSampling33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 batch,nthe quantity of liquid paint or coatingproduced in the final mixing operation after all productionprocesses are complete.For example,when a number ofpigment dispersions are reduced with additional vehicle to-gether in a large tank,the resulting final mixture is one batch.4.Significance and Use4.1 Samples are taken from batches,lots,and shipments ofpaint in order to determine their uniformity and compliancewith specification requirements.It is very important that thesesamples be of convenient and economical size and that they berepresentative of the batch of paint at the time it was filled intoshipping or storage containers.4.2 The time and effort necessary to ensure that the sampleis representative of the original material will be repaid inreduction of laboratory work and elimination of possiblerejections of acceptable material.5.Sampling Considerations5.1 The use of common sense and good judgment isimportant even in the apparently simple task of taking samples.5.2 Use care to ensure that all containers,agitatingequipment,and sampling apparatus are clean and that they canin no way contaminate the sample being taken.Slight contami-nation of the paint sample may lead to false test results.5.3 The sample container should be dry and not cooler thanthe temperature of the area in which the sample is to be taken.5.4 Because pigmented coatings are dispersions and notsolutions,finely divided pigment particles dispersed in thecoating vehicle may settle upon standing.Consequently,thor-ough and careful agitation before sampling is necessary torestore the paint to its original,uniform condition.The methodof agitating or stirring is therefore of prime importance.5.5 As soon as samples of paint are taken from the shippingor storage container,place them in clean,nonreactive,dry,air-tight containers to prevent evaporation.Do not storesamples in plastic bottles because volatile solvents may diffusethrough the walls.Loss of volatile solvents may introduceerrors in such tests as viscosity,weight per gallon,and1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 1980.Last previous edition approved in 2010 as D3925 02(2010).DOI:10.1520/D3925-02R15.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 nonvolatile content as well as other properties.If cap liners areused,they should also be nonreactive with the material.If thesample is self reactive or highly volatile,appropriate sample