ASTM_D_6859_-_11.pdf

Designation:D685911Standard Test Method forPile Thickness of Finished Level Pile Yarn Floor Coverings1This standard is issued under the fixed designation D6859;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 pilethickness of finished level pile yarn floor covering using athickness measuring instrument having a stationary surface(platen),a circular pressure foot under specified force,andcapable of being moved vertically above the platen.1.2 This test method is applicable only to finished levelloop,cutpile and cut&loop constructions with tuft heights lessthan 0.25 in.(6 mm).NOTE1Determination of pile thickness of finished level pile yarnfloor coverings was previously contained within Test Methods D418.Foruser convenience,Subcommittee D13.21 subdivided Test Methods D418into separate standards of which this test method is one.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ASTM Standards:2D123 Terminology Relating to TextilesD418 Test Method for Testing Pile Yarn Floor CoveringConstruction(Withdrawn 1998)3D1776 Practice for Conditioning and Testing TextilesD5684 Terminology Relating to Pile Floor CoveringsD5823 Test Method for Tuft Height of Pile Floor CoveringsE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or Process3.Terminology3.1 For definitions of terms relating to Pile Floor Coverings,D13.21,refer to Terminology D5684.See also Annex A1.3.1.1 The following terms are relevant to this standard:carpet,finished,finished pile yarn floor covering,floorcovering,pile,pile thickness,pile yarn floor covering,pitch.primary backing,shorn pile,stubble,stubble height,textilefloor covering,tufted fabric.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 The total thickness of an unsheared strip specimen ismeasured as the distance between two parallel plates exertinga specified pressure on the test specimen.The pile yarn of thestrip specimen is sheared down to a stubble.The backingthickness of the sheared strip specimen is measured as thedistance between two parallel plates exerting a different speci-fied pressure on the sheared strip specimen.The differencebetween the two measurements is the pile thickness.5.Significance and Use5.1 The determination of pile thickness of level pile yarnfloor covering is useful in quality and cost control during themanufacture of pile yarn floor covering.The appearance andperformance may be affected by changes in pile thickness ofpile yarn floor coverings.This test method is consideredsatisfactory for acceptance testing of commercial shipmentsbecause current estimates of between laboratory precision areacceptable,and this test method is commonly used in the tradefor acceptance 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 and1This 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 Aug.1,2011.Published October 2011.Originallyapproved in 2003.Last previous edition approved in 2005 as D685905.DOI:10.1520/D6859-11.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United