ASTM_D_8008_-_15.pdf

Designation:D800815Standard Practice forRepresentative Field Sampling of Traffic Paints1This standard is issued under the fixed designation D8008;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 practice covers procedures for obtaining represen-tative field samples of mixed or unmixed waterborne,solventborne,or other liquid traffic paints from drums,totes,ormachine striping tanks.Traffic paint samples are often takenfrom storage containers in the field by paint suppliers orgovernment agencies for laboratory testing to determine prod-uct quality and/or for approvals prior to striping.It is importantthat the samples taken are“representative”(have a compositionreflecting the overall composition in the container).Althoughtraffic paints can remain homogeneous for weeks or months,some will stratify over time and become non-homogeneous.Obtaining a representative sample can be challenging particu-larly in a field environment.The desired method for obtaininga liquid sample is to thoroughly mix the sample until homo-geneous and then sample the mixture from the top.If completemixing cant be verified then an alternative practice is to obtaina sample using a liquid tube sampling device.These deviceshave the ability to capture a top-to-bottom core of paint fromthe container.Inner or outer rod tube samplers are recom-mended for sample extraction.The inner rod tube sampler isthe preferred sampler.1.2 The practice selected for representative sampling shouldhave written agreement between the parties providing theproduct and those testing the product.1.3 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.1.4 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eterD1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsD5495 Practice for Sampling With a Composite LiquidWaste Sampler(COLIWASA)2.2 ISO Documents:3ISO 1513 Paints and varnishes Examination and prepa-ration of test samplesISO 15528 Paints,varnishes,and raw materials for paintsand varnishes Sampling3.Terminology3.1 The following terms apply to this practice:3.1.1 COLIWASA(composite liquid waste sampler),natube type device that is typically used as a zone sampler formany types of liquids.3.1.2 composite core sampler,na compartmented tubetype sampler that is potentially capable of obtaining a repre-sentative core sample.3.1.3 core sample,na sample extracted from a containertop-to-bottom with a tube type device.3.1.4 liquid scoop,na type of liquid thief sampler withcompartments and slide closure that potentially can be used toobtain a representative core sample3.1.5 liquid thief sampler,na tube or scoop device used toextract a liquid sample.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.44 on Traffic Coatings.Current edition approved July 1,2015.Published August 2015.DOI:10.1520/D8008-15.2For 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 3.1.6 pigment settling/pigment sedimentation,nincreasein pigment concentration toward the bottom of a container overtime mainly due to the effects of gravity.3.1.7 representative sample,na paint sample taken from athoroughly mixed container,or a paint sample taken by suitablemeans from a partially mixed or unmixed container that has acomposite composition equivalent to that of a thoroughlymixed container.3.1.8 stratification,nseparation of a mixture of materialsinto layers based on density.3.1.9 syneresis,na clear liquid separation at the top of apaint typically resulting from movement of lower densitycontinuous phase components upward in a paint.3.1.10 uniform sample,nsee representative sample.3.1.11 water float,nsmall amount of water added to t