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ASTM D7142-05(2021)

(Test Method)

Standard Test Method for Holding Strength of Prong-Ring Attached Snap Fasteners

Standard Test Method for Holding Strength of Prong-Ring Attached Snap Fasteners

SIGNIFICANCE AND USE
5.1 Both test methods are considered satisfactory for acceptance testing of commercial shipments of garments with prong-ring type snap fasteners.  
5.1.1 In case of dispute arising from differences in reported test results when using this test method for acceptance of commercial shipment, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using appropriate statistical analysis and an acceptable probability level chosen by the parties before testing is begun. If a bias is found, either the cause must be determined and corrected, or the purchaser and supplier must agree to interpret future test results with consideration to the known bias.  
5.2 Comparison of results from test equipment operating on different principles is not recommended. In cases of conflict between the test results achieved with manual test equipment (Option 2) and motorized CRE (constant rate of extension) tensile testing machine (Option 1), the results from the motorized equipment shall take precedence.  
5.3 This test method may be used to determine the compatibility of prong-ring type snap fasteners and fabrics for use in apparel. In which case, the fasteners are attached to the fabric in the manner in which they will be used and the combined units tested. See Annex A1.
SCOPE
1.1 This test method covers the determination of the holding strength of a prong-ring to the socket or stud of a snap fastener using a tensile testing machine (Option 1) or a manual test stand and force-measuring gage (Option 2).  
1.2 This test method is applicable to prong-ring type snap fasteners in garments or to be attached to fabrics intended for use in apparel (see Annex A1).  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as 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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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
21.060.99 - Other fasteners
Technical Committee
D13 - Textiles
Drafting Committee
D13.54 - Subassemblies
Current Stage
Ref Project

Relations

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

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ASTM D7142-05(2021) - Standard Test Method for Holding Strength of Prong-Ring Attached Snap FastenersASTM D7142-05(2021) - Standard Test Method for Holding Strength of Prong-Ring Attached Snap Fasteners
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ASTM D7142-05(2021) - Standard Test Method for Holding Strength of Prong-Ring Attached Snap Fasteners
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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: D7142 − 05 (Reapproved 2021)
Standard Test Method for
1
Holding Strength of Prong-Ring Attached Snap Fasteners
This standard is issued under the fixed designation D7142; 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 2.2 Federal Document:
16 CFR Parts 1500.48-1500.53 and 1501.4 Engineering Test
1.1 Thistestmethodcoversthedeterminationoftheholding
3
Manual for Children’s Toys
strength of a prong-ring to the socket or stud of a snap fastener
using a tensile testing machine (Option 1) or a manual test
3. Terminology
stand and force-measuring gage (Option 2).
3.1 Definitions:
1.2 This test method is applicable to prong-ring type snap
3.1.1 force, n—a physical influence exerted by one body on
fasteners in garments or to be attached to fabrics intended for
another which produces acceleration of bodies that are free to
use in apparel (see Annex A1).
move and deformation of bodies that are not free to move.
1.3 The values stated in either SI units or inch-pound units
3.1.2 holding strength, n—in snap fasteners, the force re-
are to be regarded separately as standard. Within the text, the
quired to separate the prong-ring from its attached mating part
inch-pound units are shown in parentheses. The values stated
(socket or stud).
in each system are not exact equivalents; therefore, each
3.1.2.1 Discussion—In this test method, a diametric force is
system shall be used independently of the other. Combining
applied which simulates the diametric biting or pinching of a
values from the two systems may result in non-conformance
child; however, in practice, the disengaging force used to
with the standard.
unsnap a snap fastener is usually applied at the edge of the
1.4 This standard does not purport to address all of the
fastener.
safety concerns, if any, associated with its use. It is the
3.1.3 prong-ring type fastener, n—generic name for snap
responsibility of the user of this standard to establish appro-
fasteners which use a multi-pronged ring to penetrate through
priate safety, health, and environmental practices and deter-
fabric to mechanically set a matching socket on one side of a
mine the applicability of regulatory limitations prior to use.
closure and to set a matching stud on the facing closure
1.5 This international standard was developed in accor-
allowing the outer and inner closure facings to be snapped
dance with internationally recognized principles on standard-
together. (See Fig. 1.)
ization established in the Decision on Principles for the
3.1.4 socket, n—insnapfasteners,thefemalefunctionalpart
Development of International Standards, Guides and Recom-
of the fastener which engages with the stud part of the fastener
mendations issued by the World Trade Organization Technical
to form the closure of two parts of the item on which the
Barriers to Trade (TBT) Committee.
fastener is used. (See Fig. 1.)
2. Referenced Documents
3.1.4.1 Discussion—Prong-ringattachedsocketorstudsnap
2 fasteners are designed to be mechanically attached to garments
2.1 ASTM Standards:
or other items through the deformation interaction of the
D76/D76M Specification for Tensile Testing Machines for
prong-ring with the socket or stud. Other forms of snap
Textiles
fasteners exist which may be attached to the foundation of the
D123 Terminology Relating to Textiles
garment or other item by means of sewn threads or adhesive
D1776/D1776M Practice for Conditioning and Testing Tex-
bonding.
tiles
3.1.5 strength, n—the property of a material that resists
deformation induced by external forces.
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
3.1.5.1 Discussion—In this standard, the deformation is the
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
separation of the prong-ring from the socket or stud of a snap
Current edition approved July 1, 2021. Published August 2021. Originally
approved in 2005. Last previous edition approved in 2016 as D7142 – 05 (2016). fastener.
DOI: 10.1520/D7142-05R21.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from Federal Register, Vol 44, No. 117, June 1979, Consumer
the ASTM website. Product Commission, 16 CFR Parts 1500 and 1501.
Copyright © ASTM International, 100 Barr Harbor Drive
...

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1.2 The MIM components covered by this specification may have been densified beyond their as-sintered density by post-sinter processing.  
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 nonconformance with the standard.  
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.

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