ASTM D5170-98(2004)
(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
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.
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.
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.
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.
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’t-test and an acceptable pro...
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 the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D5170 – 98 (Reapproved 2004)
Standard Test Method for
Peel Strength (“T” Method) of Hook and Loop Touch
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 3.4 The highest peaks which reflect the force required to
separate a hook and loop closure bear no simple relationship to
1.1 This test method covers the measurement of the peel
the average force (integrator average). The average of the five
strength of hook and loop touch fasteners using a recording
highest peaks better reflect performance but the integrator
constant-rate-of-extension tensile testing machine (CRE).
results may be used to characterize a closure and for quality
1.2 The values stated in inch-pound units are to be regarded
control purposes. The integrator average is relatively easy to
as the standard. The values given in parentheses are for
calculate given the proper equipment.
information only.
3.5 In the case of a dispute arising from differences in
1.3 This standard does not purport to address all of the
reported test results when using this test method for acceptance
safety problems, if any, associated with its use. It is the
testing of commercial shipments, the purchaser and the sup-
responsibility of the user of this standard to establish appro-
plier should conduct comparative tests to determine if there is
priate safety and health practices and determine the applica-
a statistical bias between their laboratories. Competent statis-
bility of regulatory limitations prior to use.
tical assistance is recommended for the investigation of bias.
2. Referenced Documents As a minimum, the two parties should take a group of test
specimens which are as homogenous as possible and which are
2.1 ASTM Standards:
from a lot of hook and loop of the type in question. The test
D618 Practice for Conditioning Plastics for Testing
specimens should then be randomly assigned in equal numbers
3. Significance and Use
to each laboratory for testing.The average results from the two
laboratories should be compared using Student’s t-test and an
3.1 This test method gives a measure of a key property of
acceptable probability level chosen by the two parties before
hook and loop touch fasteners which is of interest to users of
the testing began. If a bias is found, either its cause must be
such devices. This is a means of determining the resistance to
found and corrected or the purchaser and the supplier must
separation when forces are applied normal to the line of
agree to interpret future test results in the light of the known
separation of the fastener.
bias.
3.2 The force registered in a peel test is irregular, and as a
consequence, empirical methods have had to be developed to
4. Apparatus
obtain usable values related to peel strength. In spite of the
4.1 Roller—consisting of a smooth steel surface, approxi-
empirical nature of the reported values, it is believed they
3 1
mately 4 ⁄4 in. (121 mm) in diameter, 2 ⁄4 in. (57 mm) wide,
reflect comparative performance of similar touch fasteners
and equipped with a handle, length 4 ⁄8 in. (105 mm), for
tested and measured in the same way.
propelling the roller back and forth without adding additional
3.3 Two optional methods of calculation are provided:
weight to the specimen being rolled (See Fig. 1).The weight of
integrator average and average of five highest peaks.These test
the roller (including the handle) is 11 6 ⁄4 lbs. (4994 g 6 114
methods are not equivalent. Generally, the integrator average
g).
will be lower than the average of the five highest peaks.
4.2 Testing Machine—A constant rate of extension (CRE)
tensile tester shall be used. The tester shall have two clamps
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
with centers in the same plane, parallel to the direction of the
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
motion of the stressing clamp, and so aligned that they will
Current edition approved Oct. 1, 2004. Published November 2004. Originally
hold the specimen ends wholly in the same plane; a means of
approved in 1991. Last previous edition approved in 1998 as D5170 - 98. DOI:
10.1520/D5170-98R04.
moving the stressing clamp at a uniform rate of 12.0 6 0.5
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
in./min (305 6 13 mm/min), an autographic device for record-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ing the load; and provided with an integrator if the integrator
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. average is to be used.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5170 – 98 (2004)
FIG. 1 Roller for Making Closure of Hook and Loop Touch
Fasteners Prior to Testing
4.2.1 The instrument shall be calibrated to an accuracy of
1.0 % of the full scale and the scale range used for the test shall
be such that the main test falls within 20 to 80 % of full range.
5. Sampling
5.1 Select the test samples so as to be as representative of
the unit (a shipment, a lot, and so forth) as possible.
5.2 Lot—A lot shall consist of all the material of the same
type, color and width, made at the same time from the same
materials in no more than a two week period. It shall be
expressed in linear units of 10 000 yards (9144 m).
5.3 SampleRolls—Onerollshallberandomlyselectedfrom
each linear unit 10 000 yards (9144 m). If the lot does not
contain five units, additional rolls shall be selected from the lot
to give a sample size of five rolls.
5.4 For specification purposes, the material under test must
be mated with material supplied by the manufacturer of the
material being tested.
FIG. 2 Test Configurations for “T” Peel Strength of Hook and
Loop Fasteners (Not to Scale)
6. Specimen Preparation
6.1 Hook and loop material for this test shall be in the width
as supplied, not to exceed 1 in. (25.4 mm) in width. For
7. Conditioning
materials greater than 1 in. (25.4 mm), a 1 in. (25.4 mm)
specimen shall be slit from the center of the sample. If material
7.1 Condition the specimens in an atmosphere for testing of
less than 1 in. (25.4 mm) wide is tested, test results will not be
23 6 2°C (73.4°F 6 3.6°F) and 50 6 5 % relative humidity, as
directly proportional to those obtained with the 1 in. (25.4 mm)
described in Practice D618, for a period of 24 h or until the
wide material.
specimens reach moisture equilibrium. Lay specimens flat with
6.1.1 Remove the outer layer of each roll before selecting
the functional side up so that the conditioning atmosphere has
the required number of strips, hook and loop, 8 in. 6 ⁄4 in.
free access to them.
(203 6 6 mm) long.
6.1.2 Each specimen is marked with an arrow (↑) pointing
8. Procedure
in the direction that the specimen is unwound from the roll.
8.1 An initial closure is made and separated to raise the
This arrow is marked on the specimen on the leading end as it
loops that might have been compressed in packaging.
is unwound from the roll. The arrow (↑) indicates the direction
8.2 Select from the four specimens of hook
...
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