ASTM D6770-21

Standard Test Method for Abrasion Resistance of Textile Webbing (Hex Bar Method)

SIGNIFICANCE AND USE
5.1 The measurement of the resistance to abrasion of textile webbing is very complex. The resistance to abrasion is affected by many factors that include the inherent mechanical properties of the fibers; the dimensions of the fibers; the structure of the yarns; the construction of the webbing; the type, kind, and amount of treatment added to the fibers, yarns, or webbing; the nature of the abradant; the variable action of the abradant over the specimen area abraded; the tension on the specimen; the pressure between the specimen and the abradant; and the dimensional changes in the specimen.  
5.2 The resistance of textile webbing to abrasion as measured by this test method does not include all the factors which account for wear performance or durability in actual use. While the abrasion resistance stated in terms of the number of cycles and durability (defined as the ability to withstand deterioration or wearing out in use, including the effects of abrasion) are frequently related, the relationship varies with different end uses. Different factors may be necessary in any calculation of predicted durability from specific abrasion data.  
5.3 Laboratory tests may be reliable as an indication of relative end use in cases where the difference in abrasion resistance of various materials is large, but they should not be relied upon where differences in laboratory test findings are small. In general, the results should not be relied upon for prediction of performance during actual wear life for specific end uses unless there are data showing the specific relationship between laboratory abrasion tests and actual wear in the intended end use.  
5.4 These general observations apply to most webbings that are used in automotive, aerospace, industrial, and military applications.  
5.5 This test method can be used for acceptance testing of commercial shipments but comparisons should be made with caution because estimates of between-laboratory precision are incomplete.  
5.6 I...
SCOPE
1.1 This test method covers the determination of abrasion resistance of textile webbing using a hex bar abrasion tester.  
1.1.1 The resistance is expressed as a percentage of retained breaking strength.  
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units 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.

General Information

• Status: Published
• Publication Date: 30-Jun-2021
• ICS: 59.080.30 - Textile fabrics
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.60 - Fabric Physical Test Methods B

Relations

• Refers: ASTM D1776/D1776M-20 - Standard Practice for Conditioning and Testing Textiles
• Effective Date: 01-Feb-2020

Standards Content (Sample)

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: D6770 − 21
Standard Test Method for
1
Abrasion Resistance of Textile Webbing (Hex Bar Method)
This standard is issued under the fixed designation D6770; 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* 3. Terminology
3.1 For all terminology relating to Fabrics, refer to Termi-
1.1 This test method covers the determination of abrasion
nology D4850.
resistance of textile webbing using a hex bar abrasion tester.
3.2 For all other terminology related to textiles, refer to
1.1.1 The resistance is expressed as a percentage of retained
Terminology D123.
breaking strength.
1.2 The values stated in SI units are to be regarded as
4. Summary of Test Method
standard. The values given in parentheses after SI units are
4.1 Abrasion resistance is measured by subjecting the speci-
provided for information only and are not considered standard.
men to unidirectional reciprocal rubbing over a specific bar
under specified conditions of tension, stroke length and time.
1.3 This standard does not purport to address all of the
Resistance to abrasion is evaluated by determining the percent
safety concerns, if any, associated with its use. It is the
retention of breaking force of an abraded specimen compared
responsibility of the user of this standard to establish appro-
to an unabraded specimen.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 This international standard was developed in accor-
5.1 The measurement of the resistance to abrasion of textile
dance with internationally recognized principles on standard-
webbing is very complex.The resistance to abrasion is affected
ization established in the Decision on Principles for the
bymanyfactorsthatincludetheinherentmechanicalproperties
Development of International Standards, Guides and Recom-
of the fibers; the dimensions of the fibers; the structure of the
mendations issued by the World Trade Organization Technical
yarns; the construction of the webbing; the type, kind, and
Barriers to Trade (TBT) Committee.
amount of treatment added to the fibers, yarns, or webbing; the
nature of the abradant; the variable action of the abradant over
2. Referenced Documents
the specimen area abraded; the tension on the specimen; the
2
pressure between the specimen and the abradant; and the
2.1 ASTM Standards:
dimensional changes in the specimen.
D123 Terminology Relating to Textiles
D1776/D1776M Practice for Conditioning and Testing Tex-
5.2 The resistance of textile webbing to abrasion as mea-
tiles
sured by this test method does not include all the factors which
D4850 Terminology Relating to Fabrics and Fabric Test
accountforwearperformanceordurabilityinactualuse.While
Methods
the abrasion resistance stated in terms of the number of cycles
D6775 TestMethodforBreakingStrengthandElongationof
and durability (defined as the ability to withstand deterioration
Textile Webbing, Tape and Braided Material
or wearing out in use, including the effects of abrasion) are
E177 Practice for Use of the Terms Precision and Bias in
frequently related, the relationship varies with different end
ASTM Test Methods
uses. Different factors may be necessary in any calculation of
predicted durability from specific abrasion data.
5.3 Laboratory tests may be reliable as an indication of
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
relative end use in cases where the difference in abrasion
and is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,
resistance of various materials is large, but they should not be
Specific.
relied upon where differences in laboratory test findings are
Current edition approved July 1, 2021. Published September 2021. Originally
small. In general, the results should not be relied upon for
approved in 2002. Last previous edition approved in 2019 as D6770–07(2019).
DOI: 10.1520/D6770-21.
prediction of performance during actual wear life for specific
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
end uses unless there are data showing the specific relationship
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
between laboratory abrasion tests and actual wear in the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. intended end use.
*A Summary of Changes section appears
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6770 − 07 (Reapproved 2019) D6770 − 21
Standard Test Method for
1
Abrasion Resistance of Textile Webbing (Hex Bar Method)
This standard is issued under the fixed designation D6770; 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 Scope*
1.1 This test method covers the determination of abrasion resistance of textile webbing using a hex bar abrasion tester.
1.1.1 The resistance is expressed as a percentage of retained breakbreaking strength.
1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units 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
2
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
D1776/D1776M Practice for Conditioning and Testing Textiles
D4850 Terminology Relating to Fabrics and Fabric Test Methods
D6775 Test Method for Breaking Strength and Elongation of Textile Webbing, Tape and Braided Material
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
2.2 Other Standard:
3
Federal Standard 191A, Method 4108 “Strength and Elongation, Breaking; Textile Webbing, Tape and Braided Items”
3. Terminology
3.1 For all terminology relating to Fabrics, refer to Terminology D4850.
3.2 The following terms are relevant to this standard: abrasion, abrasion cycle, breaking force, standard atmosphere for
preconditioning textiles, standard atmosphere for testing textiles, stroke, in hex bar abrasion testing, webbing.
1
This test method is under the jurisdiction of ASTM Committee D13 on Textiles and is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods, Specific.
Current edition approved Dec. 1, 2019July 1, 2021. Published December 2019September 2021. Originally approved in 2002. Last previous edition approved in 20152019
as D6770–07(2015).D6770–07(2019). DOI: 10.1520/D6770-07R19.10.1520/D6770-21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D6770 − 21
3.2 For all other terminology related to textiles, refer to Terminology D123.
4. Summary of Test Method
4.1 Abrasion resistance is measured by subjecting the specimen to unidirectional reciprocal rubbing over a specific bar under
specified conditions of tension, stroke length and time. Resistance to abrasion is evaluated by determining the percent retention
of breaking force of an abraded specimen compared to an unabraded specimen.
5. Significance and Use
5.1 The measurement of the resistance to abrasion of textile webbing is very complex. The resistance to abrasion is affected by
many factors that include the inherent mechanical properties of the fibers; the dimensions of the fibers; the structure of the yarns;
the construction of the webbing; the type, kind, and amount of treatment added to the fibers, yarns, or webbing; the nature of the
abradant; the variable action of the abradant over the specimen area abraded; the tension on the specimen; the pressure between
the specimen and the abradant; and the dimensional changes in the specimen.
5.2 The resistance of textile webbing to abrasion as measured by this test method does not include all the factors which account
for wear performance or durability in actual use. While the abrasion resistance stated in terms of the numbe
...