ASTM_F_410_-_08_2013.pdf

Designation:F41008(Reapproved 2013)Standard Test Method forWear Layer Thickness of Resilient Floor Coverings byOptical Measurement1This standard is issued under the fixed designation F410;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()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 thick-ness of the wear layer of resilient non-textile floor coverings,intile or sheet form,with or without felt backing or foam layer,by optical measurement.1.2 This test method is applicable for wear layers with aminimum thickness of 0.0004 in.(0.01 mm)to a maximumthickness of 0.1 in.(2.54 mm),where measurements within0.0001 in.or 0.0025 mm are tolerable.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:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Significance and Use3.1 This test method is applicable for wear layers with aminimum thickness of 0.001 in.(0.02 mm)to a maximumthickness of 0.1 in.(2.54 mm),where measurements within0.0005 in.or 0.01 mm are tolerable.4.Apparatus4.1 Compound Microscope,having a magnification of atleast 40,equipped with an eyepiece micrometer of the ruleddisk or filar type.The scale shall cover approximately 0.1 in.(2.54 mm)and each division shall be equal to approximately0.0004 in.(0.01 mm)at the object.Either a binocular orstandard microscope may be used.4.2 Vertical Illuminator(recommended),to illuminate thespecimen.If another source is used,the light should fall on thespecimen from as nearly vertical direction as possible.4.3 Stage Micrometer,for calibrating the eyepiece microm-eter.The scale shall have the smallest division equal to 0.0004in.(0.01 mm)and shall cover at least 0.1 in.(2.54 mm).Thereference standard used for calibration shall be traceable to aNational Standard.4.4 HolderA means for holding the specimen,withoutdistortion,so that the cut edge is perpendicular to the opticalaxis of the microscope.4.5 Sharp Knife,or razor blade in a holder,for cutting thespecimen.4.6 Cutting Board of plastic,hardboard or fine-grainedhardwood.4.7 Straightedge,for guiding the cutting edge.5.Test Specimen5.1 The specimen shall be cut from a properly selectedsample,representing the area to be measured.It shall beapproximately 2 in.(50 mm)long on the edge to be measuredby about 0.5 in.(13 mm)in width.6.Procedure6.1 Preparation of SpecimenPlace the sample on thecutting board with the face side up.Hold the cutting instrumentso that the plane of the blade is perpendicular to the face of thesample.The cutting edge of the blade should be at an angle tothe horizontal that produces a clean cut.It is essential that thecut is perpendicular to the face of the sample.Apply sufficientpressure so that a clean cut can be made completely through thesample in one stroke,being careful not to distort the sample or1This test method is under the jurisdiction ofASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.20 on TestMethods-Products Construction/Materials.Current edition approved Dec.1,2013.Published January 2014.Originallyapproved in 1975.Last previous edition approved in 2008 as F41008.DOI:10.1520/F0410-08R13.2For 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 turn the knife from the perpendicular.The cut should bestraight,and at least 2 in.(50 mm)long.Make a similar cutparallel to the first cut,about 0.5 in.(13 mm)apart.Cut eachend,so the specimen can be removed from the sample.6.2 Thickness Measurement:6.2.1 Mount the specimen with the long edge up,the cutsurface perpendicular to the optical axis of the microscope(seeAppendix X1).6.2.2 CalibrationCalibrate the eyepiece micrometeragainst the stage micrometer,and record the calibration factor.If a variable magnification(zoom)instrument,or one withadjustable tube length is used,be sure that these adjustmentsare not disturbed between calibration and measurement of thesample.6.