ASTM D5169-98(2004)
(Test Method)Standard Test Method for Shear Strength (Dynamic Method) of Hook and Loop Touch Fasteners
Standard Test Method for Shear Strength (Dynamic 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 parallel to the plane of the fastener.
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 probability level chosen by the two parties before the testing began. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in the light of the known bias.
SCOPE
1.1 This test method measures the shear strength of hook and loop touch (CRE) fasteners using a recording constant rate of extension tensile testing machine.
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 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D5169 – 98 (Reapproved 2004)
Standard Test Method for
Shear Strength (Dynamic Method) of Hook and Loop Touch
Fasteners
This standard is issued under the fixed designation D5169; 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 3.1.1.1 Discussion—This fastener comprises a non-
adhesive method of joining two materials where ready adjust-
1.1 This test method measures the shear strength of hook
ment and removal is desirable and fastening is accomplished
and loop touch (CRE) fasteners using a recording constant rate
by pressing the mating strips together and separation is
of extension tensile testing machine.
accomplished by simply peeling apart. Terms herein referring
1.2 The values stated in inch-pound units are to be regarded
to hook and loop fastening systems shall be construed to
as the standard. The values given in parentheses are for
include other types of touch fasteners in which the fastening
information only.
strength in the shear mode (that is, against forces applied in the
1.3 This standard does not purport to address all of the
plane of the fastener) substantially exceeds the fastening
safety concerns, if any, associated with its use. It is the
strength in the peel mode (that is, against forces applied
responsibility of the user of this standard to establish appro-
perpendicular to the planes of the two components of the
priate safety and health practices and determine the applica-
fastener).
bility of regulatory limitations prior to use.
3.1.2 shear strength, n—the resistance to forces that cause,
2. Referenced Documents or tend to cause, two contiguous parts of a body to slide
relatively to each other in a direction parallel to their plane of
2.1 ASTM Standards:
contact.
D76 Specification for Tensile Testing Machines for Textiles
3.2 For definitions of other textile terms used in this test
method, refer to Terminology D123.
D123 Terminology Relating to Textiles
D618 Practice for Conditioning Plastics for Testing
4. Summary of Test Method
3. Terminology
4.1 An area of hook surface is applied to an area of loop
surface with controlled engagement pressure. This combina-
3.1 Definitions:
tion is subjected to a dynamic shear force acting parallel to the
3.1.1 hook and loop fastener—a touch fastener, comprised
surfaces of the specimens.
of two flexible mating strips, the surface of one mating strip
being covered with tiny, stiff protrusions shaped like hooks
5. Significance and Use
which engage the other mating strip which is covered with
5.1 This test method gives a measure of a key property of
pliable loops.
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 parallel to the plane of the
This test method is under the jurisdiction ofASTM Committee D13 onTextiles
fastener.
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
5.2 In the case of a dispute arising from differences in
Current edition approved Oct. 1, 2004. Published November 2004. Originally
reported test results when using this test method for acceptance
approved in 1991. Last previous edition approved in 1998 as D5169 – 98. DOI:
10.1520/D5169-98R04.
testing of commercial shipments, the purchaser and the sup-
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
plier should conduct comparative tests to determine if there is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
a statistical bias between their laboratories. Competent statis-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tical assistance is recommended for the investigation of bias.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D5169 – 98 (2004)
As a minimum, the two parties should take a group of test 7.4 For specification purposes, the material under test must
specimens which are as homogenous as possible and which are be mated with material supplied by the manufacturer of the
from a lot of hook and loop of the type in question. The test material being tested.
specimens should then be randomly assigned in equal numbers
8. Specimen Preparation
to each laboratory for testing.The average results from the two
laboratories should be compared using Student’s t-test and an 8.1 Hook and loop material for this test shall be in the width
acceptable probability level chosen by the two parties before
as supplied, not to exceed 1 in. (25.4 mm) in width. For
the testing began. If a bias is found, either its cause must be materials greater than 1 in. (25.4 mm), the material shall be slit
found and corrected or the purchaser and the supplier must
to 1 in. (25.4 mm) in width. If material is less than 1 in. (25.4
agree to interpret future test results in the light of the known mm) wide as tested, test results will not be directly propor-
bias. tional to those obtained with the 1 in. (25.4 mm) wide material.
8.1.1 Remove the outer lap of each roll before selecting the
6. Apparatus
required number of strips, hook and loop, 4 in. 6 ⁄4 in.
(102 6 6 mm) long.
6.1 Roller—consisting of a smooth steel surface, approxi-
3 1 8.1.2 Each specimen is marked with an arrow (↑) pointing
mately 4 ⁄4 in. (21 mm) in diameter, 2 ⁄4 in. (57 mm) wide, and
in the direction that the specimen is unwound from the roll.
equippedwithahandle,length4 ⁄8in.(105mm),forpropelling
This arrow is marked on the specimen on the leading end as it
the roller back and forth without adding additional weight to
is unwound from the roll. The arrow (↑) indicates the direction
the specimen being rolled (see Fig. 1). The weight of the roller
1 of the hooks and loops of the specimens.
(including the handle) is 11 lbs. 6 ⁄4 lb (4994 6 114 g).
8.1.3 Select the sample consisting of the four (4) contiguous
6.2 Testing Machine—A constant rate of extension (CRE)
specimens as described in 8.1.1 and mark it with the appropri-
tensile tester shall be used. The tester shall have two clamps
ate identification (roll number, lot number, date, and so forth).
with centers in the same plane, parallel to the direction of the
There are four (4) possible direction configurations of closure
motion of the stressing clamp, and so aligned that they will
as shown in Fig. 2. The four specimens of hook and loop
hold the specimen ends wholly in the same plane; a means of
selected will be used to characterize the shear strength of each
moving the stressing clamp at a uniform rate of 12.0 6 0.5
of the configurations.
in./min (305 6 13 mm/min); an autographic device
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.