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ASTM D7241-22

(Test Method)

Standard Test Method for Pile Thickness of Finished Multilevel Pile Yarn Floor Covering

Standard Test Method for Pile Thickness of Finished Multilevel Pile Yarn Floor Covering

SIGNIFICANCE AND USE
5.1 The determination of pile thickness of multilevel pile yarn floor covering is useful in quality and cost control during manufacture of pile yarn floor covering. The appearance and performance may be affected by changes in pile thickness of pile yarn floor coverings. This test method is considered satisfactory for acceptance testing of commercial shipments because current estimates of between laboratory precision are acceptable, and this test method is commonly used in the trade for acceptance testing.  
5.2 If there are differences of practical significance between reported test results for two laboratories (or more), comparative tests should be performed to determine if there is a statistical bias between them, using competent statistical assistance. As a minimum, use the samples for such comparative tests that are as homogenous as possible, drawn from the same lot of material as the samples that resulted in disparate results during initial testing and randomly assigned in equal numbers to each laboratory. The test results from the laboratories involved should be compared using a statistical test for unpaired data, a probability level chosen prior to the testing series. If a bias is found either its cause must be found and corrected, or future test results for that material must be adjusted in consideration of the known bias.
SCOPE
1.1 This test method covers the determination of pile thickness of finished multilevel pile yarn floor covering using a thickness measuring instrument having a stationary surface (platen), a circular pressure foot under specified force, and capable of being moved vertically above the platen.  
1.2 This test method is applicable only to finished multilevel loop pile constructions.
Note 1: Determination of pile thickness of multilevel pile yarn floor coverings was previously contained within Test Method D418. For user convenience, Subcommittee D13.21 subdivided Test Method D418 into separate standards of which this test method is one.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Mar-2022
ICS
97.150 - Floor coverings
Technical Committee
D13 - Textiles
Drafting Committee
D13.21 - Pile Floor Coverings
Current Stage
Ref Project

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ASTM D7241-22 - Standard Test Method for Pile Thickness of Finished Multilevel Pile Yarn Floor CoveringASTM D7241-22 - Standard Test Method for Pile Thickness of Finished Multilevel Pile Yarn Floor Covering
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ASTM D7241-22 - Standard Test Method for Pile Thickness of Finished Multilevel Pile Yarn Floor Covering
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7241 − 22
Standard Test Method for
Pile Thickness of Finished Multilevel Pile Yarn Floor
1
Covering
This standard is issued under the fixed designation D7241; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D5823 Test Method for Tuft Height of Pile Floor Coverings
E122 Practice for Calculating Sample Size to Estimate,With
1.1 This test method covers the determination of pile
Specified Precision, the Average for a Characteristic of a
thickness of finished multilevel pile yarn floor covering using
Lot or Process
a thickness measuring instrument having a stationary surface
(platen), a circular pressure foot under specified force, and
3. Terminology
capable of being moved vertically above the platen.
3.1 For definitions of terms relating to Pile Floor Coverings,
1.2 Thistestmethodisapplicableonlytofinishedmultilevel
refer to the Terminology D5684.
loop pile constructions.
NOTE 1—Determination of pile thickness of multilevel pile yarn floor 3.2 Thefollowingtermsarerelevanttothisstandard:carpet,
coverings was previously contained within Test Method D418. For user
cut pile yarn floor covering, finished, finished pile yarn floor
convenience, Subcommittee D13.21 subdivided Test Method D418 into
covering, floor covering, pile, pile thickness, pile yarn floor
separate standards of which this test method is one.
covering, pitch, primary backing, shorn pile stubble, stubble
1.3 The values stated in inch-pound units are to be regarded
height, textile floor covering, tufted fabric.
as standard. The values given in parentheses are mathematical
3.3 For definitions of other terms related to textiles, refer to
conversions to SI units that are provided for information only
Terminology D123.
and are not considered standard.
3.4 For discussion of terminology specific to this standard,
1.4 This standard does not purport to address all of the
see Annex A1.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4.1 The thickness and mass are measured on each selected
1.5 This international standard was developed in accor- strip specimen in the unsheared condition and after removing
dance with internationally recognized principles on standard-
approximately 25, 50, 75 % and all of the pile down to a
ization established in the Decision on Principles for the stubble by shearing. The net pile thicknesses at the 25, 50, and
Development of International Standards, Guides and Recom-
75 % levels are calculated by subtracting the stubble specimen
mendations issued by the World Trade Organization Technical thickness from the thicknesses measured at each of the other
Barriers to Trade (TBT) Committee.
stages. The net pile masses are calculated by subtracting the
mass of the stubble specimen from the four other weighings.
2. Referenced Documents
The 25, 50, and 75 % net masses are expressed as a percent of
2
thenetpilemassoftheunshearedspecimenandthe25,50,and
2.1 ASTM Standards:
75 % net thicknesses are plotted against these net mass
D123 Terminology Relating to Textiles
percentages.Asmooth curve is drawn through the three plotted
D1776 Practice for Conditioning and Testing Textiles
points. The net pile thickness corresponding to 50 % net mass
D5684 Terminology Relating to Pile Floor Coverings
is read from the smooth curve and doubled to obtain the
average pile thickness.
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
and is the direct responsibility of Subcommittee D13.21 on Pile Floor Coverings.
5. Significance and Use
Current edition approved April 1, 2022. Published May 2022. Originally
5.1 The determination of pile thickness of multilevel pile
approved in 2006. Last previous edition approved in 2013 as D7241-13 which was
withdrawn in January 2022 and reinstated in April 2022. DOI: 10.1520/D7241-22.
yarn floor covering is useful in quality and cost control during
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
manufacture of pile yarn floor covering. The appearance and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
performance may be affected by changes in pile thickness of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. pile
...

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4.1 This guide is useful to select test methods or practices, or both, that are commonly used in industry for evaluating pile yarn floor covering. Refer to the test method or practice cited for the property of interest for significance and use statements.
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1.1 This test method covers the measurement of the resistance to delamination of the secondary backing applied to some pile yarn floor coverings.  
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Standard Test Method for Tuft Bind of Pile Yarn Floor Coverings

SIGNIFICANCE AND USE
5.1 Test Method D1335 for tuft bind of pile yarn floor coverings is being used for acceptance testing of commercial shipments. Comparative tests as directed in 5.1.1 may be advisable.  
5.1.1 In case of a dispute arising from differences in reported test results using this test method, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended from the investigation of bias. As a minimum, the two parties should take a group of test samples that are homogeneous as possible and are from a lot of material of the type in question. The test samples should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using appropriate statistical analysis, and a probability level chosen by the two parties before testing begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results with consideration to the known bias.  
5.2 The satisfactory performance of a pile yarn floor covering depends to a considerable extent on the maintenance of its original appearance. In a cut pile yarn floor covering an inadequate tuft bind may result in complete loss of pile in areas exposed to severe wear. In a looped pile yarn floor covering with inadequate tuft bind the pile loops may be pulled out to form unsightly long loops which may be hazardous.
SCOPE
1.1 This test method covers the measurement of force required to pull or break a tuft from a pile floor covering sample.  
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5.1 The determination of the tuft length of pile yarn floor covering is useful in quality and cost control during the manufacture of pile yarn floor covering. Both appearance and performance can be affected by changes in this characteristic.  
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SCOPE
1.1 This test method covers the measurement of tuft length and pile yarn length of uncoated pile floor coverings.  
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1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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