ASTM_F_386_-_11.pdf

Designation:F38611Standard Test Method forThickness of Resilient Flooring Materials Having FlatSurfaces1This standard is issued under the fixed designation F386;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 Department of Defense.1.Scope1.1 This test method covers the determination of thicknessof resilient nontextile floor coverings including tile and sheethaving flat surfaces.This test method should not be used onmaterials having a foamed layer.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:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Significance and Use3.1 Measurement of the thickness of the product may berequired for quality control purposes or to ensure compliancewith applicable specifications.4.Apparatus4.1 The apparatus shall consist of a comparator stand havinga flat anvil base at least 6 in.(15 cm)square,equipped with athickness gage graduated to 0.001 in.(0.02 mm).The gageshall be equipped with a flat presser foot 0.2506 0.01 in.(6.356 0.5 mm)in diameter.The foot shall exert a force of 16 6 0.1ozf(4.45 6 0.03 N)maximum.4.1.1 The contact surfaces of the anvil and the thicknessgage presser foot shall be parallel within 0.0001 in.(0.003mm).4.1.2 Before placing the micrometer into operation,thesurfaces shall be cleaned so the gage zeros properly.5.Test Specimens5.1 The test specimen shall be a minimum of one tile or a 12by 12-in.(300 by 300-mm)piece of sheet flooring.6.Calibration6.1 Calibrate the gage by means of gage blocks or shimstock of known thickness appropriate to the thickness of thematerial being measured.7.Conditioning7.1 Condition the test specimen at least 24 h at 736 3F(236 2C)and 50 6 5%relative humidity and test in the sameenvironment.8.Procedure8.1 Place the specimen with the wearing surface upward onthe comparator stand anvil,taking care that the specimen is flatagainst the anvil.8.2 Lower the presser foot gently until it contacts thesurface of the specimen.8.3 Upon contact with the surface,take a reading to thenearest 0.001 in.(0.02 mm)from the gage.Take all measure-ments at least 0.75 in.(19 mm)from any edge of the specimen.8.4 Take a total of five measurements on each specimen,atrandomly selected locations unless otherwise specified.9.Calculation9.1 Calculate the average thickness of each specimen.10.Report10.1 Report the average thickness of each specimen to thenearest 0.001 in.(0.02 mm).1This 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 March 15,2011.Published April 2011.Originallyapproved in 1973.Last previous edition approved in 2008 as F386 02(2008).DOI:10.1520/F0386-11.2For 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 10.1.1 Report the minimum or maximum thickness,or bothif required by the specification.11.Precision and Bias11.1 The precision of this test method is based on aninter-laboratory study ofASTM F386-02(2008)Standard TestMethod for Thickness of Resilient Flooring Materials HavingFlat Surfaces,conducted in 2009.Each of five laboratoriestested ten different flooring materials.Every“test result”represents the average of five individual determinations,and allparticipants were asked to report triplicate test results.Exceptfor the limited number of laboratories participating,andmaterials tested,Practice E691 was followed for the design andanalysis of the data;the details are given in anASTM ResearchReport.311.1.1 Repeatability Limit(r)Two test results obtainedwithin one laboratory shall be judged not equivalent if theydiffer by more than the“r”value for that material;“r”is theinterval representing the critical difference between two testresults for the same material,obtained by the same operatorusing the same equi