ASTM D5170-98

Standard Test Method for Peel Strength ("T" Method) of Hook and Loop Touch Fasteners

SCOPE
1.1 This test method measures peel strength of hook and loop touch fasteners using a recording constant-rate-of-extension tensile testing machine (CRE).
1.2 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.  
1.3 The values stated in inch-pound units are to be regarded as the standard.

General Information

• Status: Historical
• Publication Date: 09-Jun-1998
• ICS: 61.040 - Headgear. Clothing accessories. Fastening of clothing
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.54 - Subassemblies

Relations

• Replaced By: ASTM D5170-98(2004) - Standard Test Method for Peel Strength ("T" Method) of Hook and Loop Touch Fasteners
• Effective Date: 01-Oct-2004

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D 5170 – 98
Standard Test Method for
Peel Strength (“T” Method) of Hook and Loop Touch
Fasteners
This standard is issued under the fixed designation D 5170; 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 (e) 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 measures peel strength of hook and
the average force (integrator average). The average of the five
loop touch fasteners using a recording constant-rate-of-
highest peaks better reflect performance but the integrator
extension tensile testing machine (CRE).
results may be used to characterize a closure and for quality
1.2 This standard does not purport to address all of the
control purposes. The integrator average is relatively easy to
safety problems, if any, associated with its use. It is the
calculate given the proper equipment.
responsibility of the user of this standard to establish appro-
3.5 In the case of a dispute arising from differences in
priate safety and health practices and determine the applica-
reported test results when using this test method for acceptance
bility of regulatory limitations prior to use.
testing of commercial shipments, the purchaser and the sup-
1.3 The values stated in inch-pound units are to be regarded
plier should conduct comparative tests to determine if there is
as the standard.
a statistical bias between their laboratories. Competent statis-
2. Referenced Documents
tical assistance is recommended for the investigation of bias.
As a minimum, the two parties should take a group of test
2.1 ASTM Standards:
specimens which are as homogenous as possible and which are
D 76 Specification for Tensile Testing Machines for Tex-
from a lot of hook and loop of the type in question. The test
tiles
specimens should then be randomly assigned in equal numbers
D 123 Terminology Relating to Textiles
to each laboratory for testing. The average results from the two
D 618 Practice for Conditioning Plastics and Electrical
laboratories should be compared using Student’s t-test and an
Insulating Materials for Testing
acceptable probability level chosen by the two parties before
3. Significance and Use
the testing began. If a bias is found, either its cause must be
found and corrected or the purchaser and the supplier must
3.1 This test method gives a measure of a key property of
agree to interpret future test results in the light of the known
hook and loop touch fasteners which is of interest to users of
bias.
such devices. This is a means of determining the resistance to
separation when forces are applied normal to the line of
4. Apparatus
separation of the fastener.
4.1 Roller—consisting of a smooth steel surface, approxi-
3.2 The force registered in a peel test is irregular, and as a
3 1
mately 4 ⁄4 in. (121 mm) in diameter, 2 ⁄4 in. (57 mm) wide,
consequence, empirical methods have had to be developed to
and equipped with a handle, length 4 ⁄8 in. (105 mm), for
obtain usable values related to peel strength. In spite of the
propelling the roller back and forth without adding additional
empirical nature of the reported values, it is believed they
weight to the specimen being rolled (See Fig. 1). The weight of
reflect comparative performance of similar touch fasteners
the roller (including the handle) is 11 6 ⁄4 lbs. (4994 g 6 114
tested and measured in the same way.
g).
3.3 Two optional methods of calculation are provided:
4.2 Testing Machine—A constant rate of extension (CRE)
integrator average and average of five highest peaks. These test
tensile tester shall be used. The tester shall have two clamps
methods are not equivalent. Generally, the integrator average
with centers in the same plane, parallel to the direction of the
will be lower than the average of the five highest peaks.
motion of the stressing clamp, and so aligned that they will
hold the specimen ends wholly in the same plane; a means of
This test method is under the jurisdiction of ASTM Committee D-13 on Textiles
moving the stressing clamp at a uniform rate of 12.0 6 0.5
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
in/min (305 6 13 mm/min), an autographic device for record-
Current edition approved June 10, 1998. Published March 1999. Originally
ing the load; and provided with an integrator if the integrator
published as D 5170 - 91. Last previous edition D 5170 - 91.
Annual Book of ASTM Standards, Vol 07.01. average is to be used.
Annual Book of ASTM Standards, Vol 08.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 5170
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, etc.) 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 Sample Rolls—One roll shall be randomly selected from
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 D 618, 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 and loop, the
of the hooks and loops of the specimens.
first closure to be tested and referri
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