ASTM D6644-01(2013)

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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 31-Dec-2012
• ICS: 19.060 - Mechanical testing
• ICS: 59.020 - Processes of the textile industry
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.54 - Subassemblies

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D6644 − 01 (Reapproved 2013)
Standard Test Method for
1
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 resistance of the bridge of the button to a strain which can
cause it to fall off a garment to which it is attached.
1.1 Thistestmethodmeasurestheresistanceofthebridgeof
a sew-through button to a steadily increasing strain.
5.2 If there are differences of practical significance between
the reported test results for two laboratories (or more), com-
1.2 The values stated in either SI units or inch-pound units
parative tests should be performed to determine if there is a
are to be regarded separately as standard. The values stated in
statistical bias between them, using competent statistical assis-
each system may not be exact equivalents; therefore, each
tance. As a minimum, test samples should be used that are as
system shall be used independently of the other. Combining
homogeneous as possible, that are drawn from the material
values from the two systems may result in non-conformance
from which the disparate test results were obtained, and that
with the standard.
are randomly assigned in equal numbers to each laboratory for
1.3 This standard does not purport to address all of the
testing, Other materials with established test values may be
safety concerns, if any, associated with its use. It is the
used for this purpose. The test results for the two laboratories
responsibility of the user of this standard to establish appro-
should be compared using a statistical test for unpaired data, at
priate safety and health practices and determine the applica-
a probability level chosen prior to the testing series. If a bias is
bility of regulatory limitations prior to use.
found, either its cause must be found and corrected, or future
test results must be adjusted in consideration of the known
2. Referenced Documents
bias.
2
2.1 ASTM Standards:
3
D5497 Terminology Relating to Buttons (Withdrawn 2011)
6. Apparatus
3. Terminology
6.1 Force Gauge—One capable of measuring 20 kg (44 lb)
3.1 For button definitions, refer to Terminology D5497.
of tension or compression with an accuracy of 6 0.1 kg (6
0.22 lb). The gauge may be hand held or specially mounted.
4. Summary of Test Method
6.2 Testing Machine—A constant rate of extension (CRE)
4.1 The sew-through flange button is sewn onto fabric and
Tester shall be used. The capacity of the machine must be
positioned in a clamping fixture. The combination is subjected
selected for the break position on the gauge to fall within
to a strain recorded on a force gauge.
20-90 % of full scale.
4.2 Tests are made on sew through flange buttons before
6.3 Jaw Clamping Fixture—One capable of firmly holding
launderingordrycleaningwiththeoptionoftestingagainafter
the button, such as a long nose locking wrench or a 3-pronged
a predetermined number of launderings or dry cleanings.
clamping device.
5. Significance and Use
6.4 Commercial Sewing Machine—One capable of auto-
5.1 This test measures an important property to users of sew
matically sewing the button to. two or more layers of fabric.
through flange buttons. This is a means of determining the
7. Sampling
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
7.1 Laboratory Sample—Randomly select quantity of
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
buttons, approximately 100-200, from the same carton and
Current edition approved Jan. 1, 2013. Published February 2013. Originally
approved in 2001. Last previous edition approved in 2007 as D6644–01(2007). from boxes within that carton that adequately represent the
DOI: 10.1520/D6644-01R13.
material from which test specimens may be chosen.
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
7.2 Test Specimens—Randomly select 15-25 buttons from
Standards volume information, refer to the standard’s Document Summary page on
the laboratory sample for testing, if test specimens are submit-
the ASTM website.
3 ted for preproduction approval, testing 15 buttons is accept-
The last approved version of this historical standard is referenced on
www.astm.org. able.
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D6644 − 01 (2013)
10. Procedure
10.1 Select a set of buttons sewn onto fabric and pos
...