ASTM D5170-98(2021)
(Test Method)Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners
Standard Test Method for Peel Strength (“T” Method) of Hook and Loop Touch Fasteners
SIGNIFICANCE AND USE
3.1 This test method gives a measure of a key property of hook and loop touch fasteners which is of interest to users of such devices. This is a means of determining the resistance to separation when forces are applied normal to the line of separation of the fastener.
3.2 The force registered in a peel test is irregular, and as a consequence, empirical methods have had to be developed to obtain usable values related to peel strength. In spite of the empirical nature of the reported values, it is believed they reflect comparative performance of similar touch fasteners tested and measured in the same way.
3.3 Two optional methods of calculation are provided: integrator average and average of five highest peaks. These test methods are not equivalent. Generally, the integrator average will be lower than the average of the five highest peaks.
3.4 The highest peaks which reflect the force required to separate a hook and loop closure bear no simple relationship to the average force (integrator average). The average of the five highest peaks better reflect performance but the integrator results may be used to characterize a closure and for quality control purposes. The integrator average is relatively easy to calculate given the proper equipment.
3.5 In the case of a dispute arising from differences in reported test results when using this test method for acceptance testing of commercial shipments, 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 which are as homogenous as possible and which are from a lot of hook and loop 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 Student’s t-test...
SCOPE
1.1 This test method covers the measurement of the peel strength of hook and loop touch fasteners using a recording constant-rate-of-extension tensile testing machine (CRE).
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety problems, 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
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: D5170 − 98 (Reapproved 2021)
Standard Test Method for
Peel Strength (“T” Method) of Hook and Loop Touch
1
Fasteners
This standard is issued under the fixed designation D5170; 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 obtain usable values related to peel strength. In spite of the
empirical nature of the reported values, it is believed they
1.1 This test method covers the measurement of the peel
reflect comparative performance of similar touch fasteners
strength of hook and loop touch fasteners using a recording
tested and measured in the same way.
constant-rate-of-extension tensile testing machine (CRE).
3.3 Two optional methods of calculation are provided:
1.2 The values stated in inch-pound units are to be regarded
integrator average and average of five highest peaks.These test
as standard. The values given in parentheses are mathematical
methods are not equivalent. Generally, the integrator average
conversions to SI units that are provided for information only
will be lower than the average of the five highest peaks.
and are not considered standard.
1.3 This standard does not purport to address all of the 3.4 The highest peaks which reflect the force required to
safety problems, if any, associated with its use. It is the separate a hook and loop closure bear no simple relationship to
responsibility of the user of this standard to establish appro- the average force (integrator average). The average of the five
priate safety, health, and environmental practices and deter- highest peaks better reflect performance but the integrator
results may be used to characterize a closure and for quality
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor- control purposes. The integrator average is relatively easy to
calculate given the proper equipment.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
3.5 In the case of a dispute arising from differences in
Development of International Standards, Guides and Recom-
reported test results when using this test method for acceptance
mendations issued by the World Trade Organization Technical
testing of commercial shipments, the purchaser and the sup-
Barriers to Trade (TBT) Committee.
plier should conduct comparative tests to determine if there is
a statistical bias between their laboratories. Competent statis-
2. Referenced Documents
tical assistance is recommended for the investigation of bias.
2
2.1 ASTM Standards:
As a minimum, the two parties should take a group of test
D618 Practice for Conditioning Plastics for Testing
specimens which are as homogenous as possible and which are
from a lot of hook and loop of the type in question. The test
3. Significance and Use
specimens should then be randomly assigned in equal numbers
3.1 This test method gives a measure of a key property of to each laboratory for testing.The average results from the two
hook and loop touch fasteners which is of interest to users of
laboratories should be compared using Student’s t-test and an
such devices. This is a means of determining the resistance to acceptable probability level chosen by the two parties before
separation when forces are applied normal to the line of
the testing began. If a bias is found, either its cause must be
separation of the fastener. found and corrected or the purchaser and the supplier must
agree to interpret future test results in the light of the known
3.2 The force registered in a peel test is irregular, and as a
bias.
consequence, empirical methods have had to be developed to
4. Apparatus
1
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
4.1 Roller—consisting of a smooth steel surface, approxi-
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
3 1
mately 4 ⁄4 in. (121 mm) in diameter, 2 ⁄4 in. (57 mm) wide,
Current edition approved July 1, 2021. Published July 2021. Originally approved
1
and equipped with a handle, length 4 ⁄8 in. (105 mm), for
in 1991. Last previous edition approved in 2015 as D5170 – 98(2015). DOI:
10.1520/D5170-98R21.
propelling the roller back and forth without adding additional
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
weight to the specimen being rolled (see Fig. 1). The weight of
contact ASTM Customer Service at service@astm.org. For Annua
...
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