ASTM D6644-01(2007)

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

SIGNIFICANCE AND USE
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.
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 the standard. Within the text, the inch-pound units are shown in parentheses. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the practice.
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: 30-Jun-2007
• ICS: 19.060 - Mechanical testing
• ICS: 59.020 - Processes of the textile industry
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.54 - Subassemblies

Relations

• Replaces: ASTM D6644-01(2002) - Standard Test Method for Tension Strength of Sew-Through Flange Buttons
• Effective Date: 01-Jul-2007

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 2007)
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 5. Significance and Use
1.1 Thistestmethodmeasurestheresistanceofthebridgeof
5.1 This test measures an important property to users of sew
a sew-through button to a steadily increasing strain.
through flange buttons. This is a means of determining the
resistance of the bridge of the button to a strain which can
1.2 The values stated in either SI units or inch-pound units
cause it to fall off a garment to which it is attached.
are to be regarded separately as the standard. Within the text,
the inch-pound units are shown in parentheses. The values
5.2 If there are differences of practical significance between
stated in each system are not exact equivalents; therefore, each
the reported test results for two laboratories (or more), com-
system shall be used independently of the other. Combining
parative tests should be performed to determine if there is a
values from the two systems may result in nonconformance
statistical bias between them, using competent statistical assis-
with the practice.
tance. As a minimum, test samples should be used that are as
1.3 This standard does not purport to address all of the homogeneous as possible, that are drawn from the material
safety concerns, if any, associated with its use. It is the from which the disparate test results were obtained, and that
responsibility of the user of this standard to establish appro- are randomly assigned in equal numbers to each laboratory for
priate safety and health practices and determine the applica-
testing, Other materials with established test values may be
bility of regulatory limitations prior to use. used for this purpose. The test results for the two laboratories
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 found, either its cause must be found and corrected, or future
2.1 ASTM Standards:
3 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 lbs)
of tension or compression with an accuracy of 6 0.1 kg (6
4. Summary of Test Method
0.22 lbs). The gauge may be hand held or specially mounted.
4.1 The sew-through flange button is sewn onto fabric and
6.2 Testing Machine—A constant rate of extension (CRE)
positioned in a clamping fixture. The combination is subjected
Tester shall be used. The capacity of the machine must be
to a strain recorded on a force gauge.
selected for the break position on the gauge to fall within
4.2 Tests are made on sew through flange buttons before
20-90 % of full scale.
launderingordrycleaningwiththeoptionoftestingagainafter
a predetermined number of launderings or dry cleanings. 6.3 Jaw Clamping Fixture—One capable of firmly holding
the button, such as a long nose locking wrench or a 3-pronged
clamping device.
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
6.4 Commercial Sewing Machine—One capable of auto-
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
matically sewing the button to. two or more layers of fabric.
Current edition approved July 1, 2007. Published August 2007. Originally
approved in 2001. Last previous edition approved in 2002 as D6644–01(2002).
DOI: 10.1520/D6644-01R07.
7. Sampling
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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