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Designation: D7570 − 17Standard Test Method forEvaluation of Dimensional Stability of Pile Yarn FloorCovering 1This standard is issued under the f i xed 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 width-wise direction anddistortion likely to occur when pile f l oor coverings are exposedto various conditions of moisture and heat. This method isapplicable to all pile f l oor coverings including carpet moduleform.1.2 This method is applicable to machine made pile yarnf l oor 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 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: 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 f l oorcovering, f i nished pile yarn f l oor covering, f l oor covering,lengthwise direction, pile yarn f l oor covering, textile f l oorcovering, tufted fabric, widthwise direction3.3 For def i nitions 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 f l oor 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. Signif i cance and Use5.1 The determination of dimensional change of pile yarnf l oor covering is useful in quality and cost control duringmanufacture of pile yarn f l oor covering. The appearance andperformance may be affected by the changes in the dimensionsof pile yarn f l oor 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 signif i cance 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.1 This 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 March 1, 2017. Published March 2017. Originallyapproved in 2009. Last previous edition approved in 2009 as D7570–09. DOI:10.1520/D7570-17.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1 Copyright by ASTM Int'l (all rights reserved); Sat Sep 30 20:05:07 EDT 2017Downloaded/printed byUniversity of Edinburgh (University of Edinburgh) pursuant to License Agreement. No further reproductions authorized.