ASTM_D_3210_-_95_2016.pdf

Designation:D321095(Reapproved 2016)Standard Test Method forComparing Colors of Films from Water-Emulsion FloorPolishes1This standard is issued under the fixed designation D3210;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 covers comparing colors of films(orsolids)deposited from the emulsified particles in water emul-sion floor polishes.It is based upon luminous reflectancemeasurements made with tristimulus colorimeters such as theHunter Color Difference Meter.21.2 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3E259 Practice for Preparation of Pressed Powder WhiteReflectance Factor Transfer Standards for Hemisphericaland Bi-Directional Geometries3.Terminology3.1 Definitions:3.1.1 whiteness indexa color measurement calculatedfrom the equation4WI5 L 2 3b(1)where L and b are values measured directly with the ColorDifference Meter.L measures lightness,which is 100 forperfectly white and zero for black;and b measures yellow-ness when plus,blueness when minus,and zero for neutralgray or white.Conversion factors for instruments reading inX,Y,Z units are:L 5 10=Yb 5 7.0Y 2 0.847 Z!/=Y(2)4.Summary of Test Method4.1 Reflectance measurements are made on exaggerated orheavy dried polish films produced by saturating white filterpaper.The color measurement is expressed as whiteness index.5.Significance and Use5.1 Whiteness index obtained from reflectance measure-ments on exaggerated dried polish films on filter paper can beused as a measurement of the color of such films.5.2 Whiteness index may be useful in predicting the poten-tial discoloring effect of polish films on flooring substrates.5.3 Whiteness index should be useful in specifications whencolor comparisons are made with a standard sample polish.6.Apparatus6.1 Tristimulus Colorimeter,which gives reflectance read-ings which in turn are converted by calculations to L,a,and bcolor scale values,or these color scale values may be readdirectly from an instrument that automatically makes thecalculations.Other apparatus is satisfactory if equivalent re-sults are obtained.6.2 Filter Paper,medium flow rate,cut into strips 76.2 by152.4 mm(3 in.by 6 in.).6.3 Spring Clamp,approximately 76 mm(3 in.)wide,twoare required.NOTE1The following instruments are believed to provide colordifference measurements suitable for use with this procedure:(1)Hunter Color Difference Meter.(2)Color Eye Colorimeter.(3)General Electric Recording Spectrophotometer.(4)Colormaster Differential Colorimeter.(5)Gardner Color Difference Meter.7.Reference Standards7.1 Primary StandardThe primary standard for reflec-tance measurement is a layer of freshly prepared magnesiumoxide prepared in accordance with Recommended PracticeE259.1This test method is under the jurisdiction ofASTM Committee D21 on Polishesand is the direct responsibility of Subcommittee D21.04 on Performance TestsCurrent edition approved Oct.1,2016.Published October 2016.Originallyapproved in 1973.Last previous edition approved in 2008 as D3210 95(2008).DOI:10.1520/D3210-95R16.2Hunter,R.S.,“Photoelectric Color Difference Meter,”Journal of the OpticalSociety,Vol.48,1958,p.985.3For 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.4Hunter,R.S.,“Instruments and Test Methods for Control of Whiteness inTextile Mills,”American Dyestuff Reporter,Vol 56,No.25,Dec.4,1967,pp.8087.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.2 Instrument StandardBecause of the difficulty of pre-paring a primary reflectance standard,calibrated pieces ofpanels of white porcelain enamel or white glass known asVitrolite may be used as instrument standards.8.Test Specimen8.1 Fasten a 76.2 by 152.4 mm(3 in.by 6 in.)strip of filterpaper at each end with a spring clamp.Saturate the paper withthe polish to be tested by dipping the paper into a shallow traycontaining the polish.Remove the paper and allow it to dry ina suspended,vertical position for 24 h at ambient conditions ofapproximately 24C(75F)and 50%relative humidity.Detachthe spring clamps and store the filter paper in a clean,drycontainer until reflectance readings are taken.Prepare duplicatepaper strips for each poli