ASTM_D_5150_-_92_2013.pdf

Designation:D515092(Reapproved 2013)Standard Test Method forHiding Power of Architectural Paints Applied by Roller1This standard is issued under the fixed designation D5150;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 measures the ability of a paint to hideor obscure a surface to which it has been applied by a practicalapplication procedure.This test method covers the use of apaint roller,but the concept is expected to work equally wellwhen the application tool is a paint brush or paint pad.1.2 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.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D16 Terminology for Paint,Related Coatings,Materials,andApplicationsD1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD3924 Specification for Environment for Conditioning andTesting Paint,Varnish,Lacquer,and Related MaterialsD3925 Practice for Sampling Liquid Paints and RelatedPigmented CoatingsE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus Colorimetry3.Terminology3.1 Definitions:3.1.1 hiding power,nthe ability of a paint or paint materialas used to hide or obscure a surface to which it has beenuniformly applied(see Terminology D16).4.Summary of Test Method4.1 The test paint is applied with a roller at a specifiedspreading rate onto a test chart consisting of a series of light todark grey stripes.After drying,a second coat is applied in thesame manner over half of the chart.After the second coat hasdried,both the single-and double-coated areas are evaluatedfor hiding as judged by the darkest stripe in each area that iscompletely or almost completely obscured.5.Significance and Use5.1 Laboratory hiding power measurements of architecturalcoatings generally employ blade-type applicators that lay downfilms of highly uniform thickness.But practical applicators,such as rollers,pads,and brushes,typically apply films thatlack uniformity due to incomplete leveling,resulting in thepractical hiding power of most paints being less than thatmeasured on films applied with a drawdown blade.This testmethod simulates practical application procedures and condi-tions so as to provide an indication of the actual hidingperformance obtainable when a paint is applied by an experi-enced worker.It is not intended to duplicate painting as doneby the average consumer.5.2 Since the rheological characteristics of a paint and itsinteraction with the applicator are influencing factors,rankorder correlation between this test and one done by drawdownmight not be obtained.6.Apparatus6.1 Balance,accurate to 0.1 g.6.2 A Weight/Gallon Cup,or any other type of pycnometersuitable for determining paint density to 0.1 lb/gal.6.3 Paint Roller,3-in.(75-mm),frame,preferably one perpaint to be tested.6.4 Paint Roller Cover,3-in.(75-mm)length,with a shortnap(316to14in.(4.8 to 6.4 mm)constructed from a wovenfabric.New unused roller covers are preferred but used rollercovers may be used but must be thoroughly cleaned so theresulting appearance is like a new roller cover.When two or1This 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 July 1,2013.Published July 2013.Originally approvedin 1991.Last previous edition approved in 2009 as D5150 92(2009).DOI:10.1520/D5150-92R13.2For 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 States1 more coatings are being tested with the latter type of rollercover,each should have been used approximately the samenumber of times and should be well dried out from previousapplications.6.5 Paint Tray.7.Materials7.1 Practical Opacity ChartsThese are smooth surface,sealed paper test charts on which are printed a 6-step series ofgrey stripes of increasing darkness numbered from 1 to 6.Thetest area is 6 ft2(5575 cm2).For more com