ASTM_D_7570_-_09.pdf

Designation:D757009Standard Test Method forEvaluation of Dimensional Stability of Pile Yarn FloorCovering1This standard is issued under the fixed designation D7570;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 the determination of dimen-sional changes in the lengthwise and widthwise direction anddistortion likely to occur when pile floor coverings are exposedto various conditions of moisture and heat.This method isapplicable to all pile floor coverings including carpet moduleform.1.2 This method is applicable to machine made pile yarnfloor covering.1.3 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversion to SI units that are proveded 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:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD5684 Terminology Relating to Pile Floor CoveringsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 For all terminology relating to D13.21,Pile Yarn FloorCoverings,refer to Terminology D5684.3.2 The following terms are relevant to this standard:backing,carpet,dimensional stability,cut pile yarn floorcovering,finished pile yarn floor covering,floor covering,lengthwise direction,pile yarn floor covering,textile floorcovering,tufted fabric,widthwise direction3.3 For definitions of other terms related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 This test method describes the dimensional stability ofmachine made pile yarn floor coverings when subjected toheat,water and various atmospheric conditions.The dimen-sions of the specimen are measured in the original state andafter each stage of conditioning in the lengthwise and width-wise directions.The change in the dimensions are determinedand reported to the nearest.001 in.(.03 mm).5.Significance and Use5.1 The determination of dimensional change of pile yarnfloor covering is useful in quality and cost control duringmanufacture of pile yarn floor covering.The appearance andperformance may be affected by the changes in the dimensionsof pile yarn floor covering.This test method is consideredsatisfactory for acceptance testing of commercial shipmentbecause current estimates of between laboratory precision areacceptable,and this method is commonly used in the trade foracceptance testing.5.2 If there are differences of practical significance betweenreported test results for two laboratories(or more),compara-tive tests should be performed to determine if there is astatistical bias between them using competent statistical assis-tance.As a minimum use the samples for such comparativetests that are as homogenous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing and randomly assigned in equal numbersto each laboratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,a probability level chosen prior to the testingseries.If a bias is found either its cause must be found andcorrected,or future test results for that material must beadjusted in consideration of the known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.Current edition approved Sept.1,2009.Published February 2010.DOI:10.1520/D7570-09.2For 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 6.Apparatus6.1 Measuring Device,capable of measuring a dimension toan accuracy of 0.001 in.(0.03 mm).A loading plate made ofmetal or glass with dimensions slightly smaller than the testspecimen or any other device capable of keeping the specimenflat during measurement of dimensional change.6.2 Support Plate,with a dimension slightly larger than thetest specimens on which to place specimen during measure-ment.6.3 Laboratory Oven,with forced ventilation capable ofmaintaining a temperature of 140 6 2 F(60 6 1 C)equipped with p