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ASTM D7842/D7842M-12

(Test Method)

Standard Test Method for Holding Strength of Tack and Prong Fastener Attached Buttons

Standard Test Method for Holding Strength of Tack and Prong Fastener Attached Buttons

SIGNIFICANCE AND USE
5.1 This test method may be used for acceptance testing of commercial shipments of garments with attached buttons.  
5.2 This test method may be used to determine the compatibility of tack attached buttons or prong fastener attached buttons to fabrics used in apparel. In which case, the buttons are attached to the fabric in the manner in which they will be used and the combined units tested.
SCOPE
1.1 This test method covers the determination of the holding strength of a tack and prong fastener attached button using a tensile testing machine.  
1.2 This test method is applicable to attached buttons in garments or to be attached to fabrics intended for use in apparel (see Annex A1).  
1.3 Units—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.  
1.4 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-Nov-2012
ICS
61.040 - Headgear. Clothing accessories. Fastening of clothing
Technical Committee
D13 - Textiles
Drafting Committee
D13.54 - Subassemblies
Current Stage
Ref Project

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ASTM D7842/D7842M-12 - Standard Test Method for Holding Strength of Tack and Prong Fastener Attached ButtonsASTM D7842/D7842M-12 - Standard Test Method for Holding Strength of Tack and Prong Fastener Attached Buttons
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ASTM D7842/D7842M-12 - Standard Test Method for Holding Strength of Tack and Prong Fastener Attached Buttons
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D7842/D7842M − 12
StandardTest Method for
Holding Strength of Tack and Prong Fastener Attached
Buttons
This standard is issued under the fixed designation D7842/D7842M; 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 3.1.1 force, n—a physical influence exerted by one body on
another which produces acceleration of bodies that are free to
1.1 Thistestmethodcoversthedeterminationoftheholding
move and deformation of bodies that are not free to move.
strength of a tack and prong fastener attached button using a
3.1.2 holding strength, n—in buttons, the force required to
tensile testing machine.
separate the button from its attached mating part or separate
1.2 This test method is applicable to attached buttons in
from the fabric it is attached to, whichever shall fail first.
garmentsortobeattachedtofabricsintendedforuseinapparel
3.1.3 tack attached button, n—any button that is attached by
(see Annex A1).
a single post product (most commonly used to attach a non
1.3 Units—The values stated in either SI units or inch-
metal colleted button). (See Fig. 1.)
pound units are to be regarded separately as standard. The
3.1.4 prong fastener attached button, n—any button that is
values stated in each system may not be exact equivalents;
attached by a product with 2 or more prongs (most commonly
therefore, each system shall be used independently of the other.
used to attach a metal colleted button). (See Fig. 2.)
Combining values from the two systems may result in non-
conformance with the standard.
3.1.5 For definitions of other textile terms used in this
standard, refer to Terminology D123.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Test Method
responsibility of the user of this standard to establish appro-
4.1 A specimen, consisting of a button and tack or prong
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. fastener attached to a fabric, is mounted in a special test fixture
on a tensile testing machine.Aforce is applied perpendicularly
2. Referenced Documents
untilthebuttonseparatesfromthetackorprongfastener,orthe
fabric is torn. The peak force at separation is reported as the
2.1 ASTM Standards:
holding strength. If the fabric tears, the peak force at fabric
D76 Specification for Tensile Testing Machines for Textiles
failure is recorded and the data is reported and considered as a
D123 Terminology Relating to Textiles
different category to be reported separately from the holding
D1776 Practice for Conditioning and Testing Textiles
strength of the fasteners.
2.2 Federal Document:
16 CFR Parts 1500.48-1500.53 and 1501.4 Engineering Test
5. Significance and Use
Manual for Children’s Toys
5.1 This test method may be used for acceptance testing of
commercial shipments of garments with attached buttons.
3. Terminology
5.2 This test method may be used to determine the compat-
3.1 Definitions:
ibility of tack attached buttons or prong fastener attached
buttons to fabrics used in apparel. In which case, the buttons
are attached to the fabric in the manner in which they will be
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
used and the combined units tested.
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
Current edition approved Dec. 1, 2012. Published December 2012. DOI:
10.1520/D7842-12.
6. Apparatus
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Tensile Testing Machine, CRE type, meeting Specifica-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
tion D76. (See Fig. 3.)
the ASTM website.
6.1.1 Upper Test Fixture, Fig. 4, designed as not to malform
Available from U.S. Government Printing Office Superintendent of Documents,
the button specimen with interchangeable bottom plates to test
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
www.access.gpo.gov. a multitude of sizes of buttons.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D7842/D7842M − 12
9. Calibration and Standardization
9.1 Testing equipment should be calibrated on a regular
basis as recommended by manufacturer’s instructions.
10. Conditioning
10.1 Condition the specimens by bringing them from the
dry side to approximate moisture equilibrium for testing in the
standard atmosphere for testing textiles as directed in Practice
FIG. 1 Tack Attached
D1776.
11. Procedure
11.1 The attached button is placed in the test fixture. The
test fixture is clamped to the top jaws of the Tensile Testing
machineandthefabricisclampedtothebottomjaws.(SeeFig.
5.)
11.2 Initiate the test by applying force to the machine until
the button disengages from the fastener or the fabric tears.
FIG. 2 Prong Fastener Attached
11.3 Record the force to disengage the button from the
fastener as the holding force to the nearest 0.1 N [0.5 lbf].
7. Sampling, Test Specimens, and Test Units
12. Calculation or Interpretation of Results
7.1 Lot Sample:
7.1.1 For acceptance testing, randomly select the number of
12.1 If the fabric tears before the fastener and button
shipping cartons or other containers of
...

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5.2 This test method is considered satisfactory for acceptance testing of commercial shipments because the method has been used extensively in the trade for acceptance testing.  
5.2.1 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 a statistical bias between them, using competent statistical assistance. As a minimum, the 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 from the two laboratories should be compared using a statistical test 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.  
5.3 The method(s) in the standard along with those in Test Methods D2051, D2052, D2053, D2054, D2057, D2059, D2060, D2061, and D2062 are a collection of proven test methods. They can be used as aids in the evaluation of zippers without the need for a thorough knowledge of zippers. The enumerated test methods do not provide for the evaluation of all zipper properties. Besides those properties measured by means of the enumerated test methods there are other properties that may be important for the satisfactory performance of a zipper. Test methods for measuring those properties have not been published either because no practical methods have yet been developed or because a valid evaluation of the information resulting from existing unpublished methods requires an intimate and thoroug...
SCOPE
1.1 This test method covers the determination of the durability of the enamel or other decorative coating of zippers when subjected to drycleaning.  
1.2 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.  
1.3 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.

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