ASTM_F_970_-_07_2011.pdf

Designation:F97007(Reapproved 2011)Standard Test Method forStatic Load Limit1This standard is issued under the fixed designation F970;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.1.Scope1.1 This test method is intended for use in determining therecovery properties of resilient floor covering after long-termindentation test,24 h under the load specified in the detailspecification.The reported value,residual indentation,is thedepth of the depression remaining 24 h after removal of thespecified load.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:2E171 Practice for Conditioning and Testing Flexible BarrierPackagingE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodF386 Test Method for Thickness of Resilient Flooring Ma-terials Having Flat SurfacesF387 Test Method for Measuring Thickness of ResilientFloor Covering With Foam LayerF1914 Test Methods for Short-Term Indentation and Re-sidual Indentation of Resilient Floor Covering3.Significance and Use3.1 This test method is a meaningful test for determining theindentation recovery properties of resilient floor covering.33.2 As testing is conducted on uninstalled flooring,resultsare not necessarily an indicator of the floor coverings installedperformance.34.Apparatus4.1 The following apparatus shall be used:4.2 Conditioning Room,providing the standard laboratoryatmosphere of 50 6 5%relative humidity at a temperature of73.4 6 3.6F(23 6 2.0C).4.3 Indentation Machine,as described in Section 12 andpictured in Fig.2 of Test Method F1914.4.4 Indentor Plates,each constructed of a piece of 2-in.(50.8 mm)square stainless steel,0.240 6 0.005 in.(6.1 6 0.1mm)thick,with one side turned to 1.125 in.(28.6 mm)indiameter(one square inch area)to depth of 0.150 in.(3.8 mm)(see Fig.1).4.5 Dial Micrometer,as described in Test Method F386when measuring resilient floor coverings containing a foamlayer as part of the construction or as described in Test MethodF387 when measuring all other resilient floor coverings.4.6 Template of Poly(methyl Methacrylate)(PMMA),or ofother transparent material,2 by 2 in.(50.8 by 50.8 mm)withround scratch line centered on the template that is 1.125 in.(28.58 mm)in diameter,defining the test area,and with a12in.(12.7 mm)diameter hole at the center of the template to drawa circle on the specimen where thickness will be measured.4.7 Die,2 by 2 in.(50.8 by 50.8 mm)and press,papercutter,or equivalent to cut specimens to 2 by 2 in.size(50.8 by 50.8mm).1This test method is under the jurisdiction ofASTM Committee F06 on ResilientFloor Coverings and is the direct responsibility of Subcommittee F06.30 on TestMethods-Performance.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 1987.Last previous edition approved in 2007 as F97007.DOI:10.1520/F0970-07R11.2For 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.3For additional information,see Resilient Floor Covering Institute(RFCI)document,Static Limit Testing of Resilient Flooring Products,available from RFCI,401 E.Jefferson,Suite 102,Rockville,MD 20850,Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.8 OptionalOpen box without spring clips for 2 by 2 in.(50.8 by 50.8 mm)photographic slides,or equivalent,toseparate specimens during conditioning and recovery periods.5.Sampling,Test Specimens and Test Units5.1 The specimens shall be 2 by 2 in.(50.8 by 50.8 mm).The test unit shall consist of three specimens.5.2 The central one square inch test area of each specimenshould be free of mortar lines or other embossing lines,ifpossible.If not possible,the largest flat,raised area should becentered on the specimen.5.3 If the sample is nubble embossed,the specimen shouldbe cut so that a nub is at the center of the specimen where thespecimen will be measured.5.4 A circle slightly larger than the 0.250 in.(6.35 mm)diameter foot of the thickness gauge(4.5)is drawn on the wearlayer at the center of the specimen,using the PMMA template(4.6),to ensure that thickness measurements are made at thesame sp