ASTM D2646 - 18
Standard Guide for Backing Fabric Characteristics of Pile Yarn Floor Coverings
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Significance and Use
5.1 These test methods may be used for acceptance testing of commercial shipments; however, caution is advised because information about between interlaboratory precision is incomplete. Comparative tests as directed in 5.1.1 may be advisable.
5.1.1 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 statistical bias between them using competent statistical assistance. As a minimum, use test samples for such comparative tests that are as homogeneous as possible, drawn from the same lot of material as the samples that resulted in the disparate results during initial testing, and that are randomly assigned in equal numbers to each laboratory for testing. The test results from the laboratories should be compared using statistical test for unpaired data at 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.
5.2 These test methods are useful to evaluate quality and cost control during the manufacture of pile yarn floor covering.
5.3 The significance and uses of particular properties and test methods are discussed in the appropriate sections of the specified test methods.
1. Scope
1.1 This guide covers the procedures listed as follows for testing woven, knitted and nonwoven backing fabrics designed for use in the manufacture of pile yarn floor coverings. The procedures appear in the following order:
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| Section |
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| Bow and Skewness of Woven Fabrics | 8 |
| Breaking Force of Woven and Nonwoven Fabrics | 15 |
| Breaking Force After Tufting of Woven and Nonwoven Fabrics | 16 |
| Extractable Matter | 9 |
| Fabric Count of Woven Fabrics | 12 |
| Fabric Count of Knitted Fabrics | 13 |
| Length of Woven Fabrics | 11 |
| Mass per Unit Area (Weight) of Woven Fabrics | 14 |
| Width of Woven Fabrics | 10 |
1.2 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.
1.3 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.
1.4 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D123 Terminology Relating to Textiles
D1776 Practice for Conditioning and Testing Textiles
D2257 Test Method for Extractable Matter in Textiles
D3773 Test Methods for Length of Woven Fabric
D3774 Test Method for Width of Textile Fabric
D3775 Test Method for End (Warp) and Pick (Filling) Count of Woven Fabrics
D3776 Test Methods for Mass Per Unit Area (Weight) of Fabric
D3882 Test Method for Bow and Skew in Woven and Knitted Fabrics
D3887 Specification for Tolerance for Knitted Fabrics
D5034 Test Method for Breaking Strength and Elongation of Textile Fabrics (Grab Test)
D5684 Terminology Relating to Pile Floor Coverings
ICS Code
ICS Number Code 59.080.30 (Textile fabrics)
UNSPSC Code
UNSPSC Code 30161719(Carpet or rug underlays)
Referencing This Standard
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DOI: 10.1520/D2646-18
Citation Format
ASTM D2646-18, Standard Guide for Backing Fabric Characteristics of Pile Yarn Floor Coverings, ASTM International, West Conshohocken, PA, 2018, www.astm.org
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