ASTM D6644-01(2021)

Standard Test Method for Tension Strength of Sew-Through Flange Buttons

SIGNIFICANCE AND USE
5.1 This test measures an important property to users of sew through flange buttons. This is a means of determining the resistance of the bridge of the button to a strain which can cause it to fall off a garment to which it is attached.  
5.2 If there are differences of practical significance between the 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, test samples should be used that are as homogeneous as possible, that are drawn from the material from which the disparate test results were obtained, and that are randomly assigned in equal numbers to each laboratory for testing, Other materials with established test values may be used for this purpose. The test results for the two laboratories should be compared using a 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 must be adjusted in consideration of the known bias.
SCOPE
1.1 This test method measures the resistance of the bridge of a sew-through button to a steadily increasing strain.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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: 19.060 - Mechanical testing
• ICS: 59.020 - Processes of the textile industry
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.54 - Subassemblies

Relations

• Refers: ASTM D618-08 - Standard Practice for Conditioning Plastics for Testing
• Effective Date: 01-Nov-2008
• Refers: ASTM D618-05 - Standard Practice for Conditioning Plastics for Testing
• Effective Date: 01-Nov-2005
• Refers: ASTM D618-00 - Standard Practice for Conditioning Plastics for Testing
• Effective Date: 10-Nov-2000
• Refers: ASTM D5497-94c(2000) - Standard Terminology Relating to Buttons
• Effective Date: 01-Jan-1994

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: D6644 − 01 (Reapproved 2021)
Standard Test Method for
Tension Strength of Sew-Through Flange Buttons
This standard is issued under the fixed designation D6644; 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 4.2 Tests are made on sew through flange buttons before
laundering or dry cleaning with the option of testing again after
1.1 Thistestmethodmeasurestheresistanceofthebridgeof
a predetermined number of launderings or dry cleanings.
a sew-through button to a steadily increasing strain.
1.2 The values stated in either SI units or inch-pound units
5. Significance and Use
are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to
5.1 This test measures an important property to users of sew
ensure conformance with the standard, each system shall be
through flange buttons. This is a means of determining the
used independently of the other, and values from the two
resistance of the bridge of the button to a strain which can
systems shall not be combined.
cause it to fall off a garment to which it is attached.
1.3 This standard does not purport to address all of the
5.2 If there are differences of practical significance between
safety concerns, if any, associated with its use. It is the
the reported test results for two laboratories (or more), com-
responsibility of the user of this standard to establish appro-
parative tests should be performed to determine if there is a
priate safety, health, and environmental practices and deter-
statistical bias between them, using competent statistical assis-
mine the applicability of regulatory limitations prior to use.
tance. As a minimum, test samples should be used that are as
1.4 This international standard was developed in accor-
homogeneous as possible, that are drawn from the material
dance with internationally recognized principles on standard-
from which the disparate test results were obtained, and that
ization established in the Decision on Principles for the
are randomly assigned in equal numbers to each laboratory for
Development of International Standards, Guides and Recom-
testing, Other materials with established test values may be
mendations issued by the World Trade Organization Technical
used for this purpose. The test results for the two laboratories
Barriers to Trade (TBT) Committee.
should be compared using a statistical test for unpaired data, at
2. Referenced Documents
a probability level chosen prior to the testing series. If a bias is
2.1 ASTM Standard:
found, either its cause must be found and corrected, or future
D618 Practice for Conditioning Plastics for Testing
test results must be adjusted in consideration of the known
D5497 Terminology Relating to Buttons (Withdrawn 2011)
bias.
3. Terminology
6. Apparatus
3.1 For button definitions, refer to Terminology D5497.
6.1 Force Gauge—One capable of measuring 20 kg [44 lb]
4. Summary of Test Method
of tension or compression with an accuracy of 60.1 kg
4.1 The sew-through flange button is sewn onto fabric and
[60.22 lb]. The gauge may be hand held or specially mounted.
positioned in a clamping fixture. The combination is subjected
to a strain recorded on a force gauge. 6.2 Testing Machine—A constant rate of extension (CRE)
Tester shall be used. The capacity of the machine must be
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
selected for the break position on the gauge to fall within 20 %
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
to 90 % of full scale.
Current edition approved July 1, 2021. Published August 2021. Originally
approved in 2001. Last previous edition approved in 2013 as D6644–01 (2013).
6.3 Jaw Clamping Fixture—One capable of firmly holding
DOI: 10.1520/D6644-01R21.
the button, such as a long nose locking wrench or a 3-pronged
For referenced ASTM sta
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