ASTM D5169-98

Standard Test Method for Shear Strength (Dynamic Method) of Hook and Loop Touch Fasteners

SCOPE
1.1 This test method measures the shear 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: 21.060.01 - Fasteners in general
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.54 - Subassemblies

Relations

• Replaced By: ASTM D5169-98(2004) - Standard Test Method for Shear Strength (Dynamic Method) of Hook and Loop Touch Fasteners
• Effective Date: 01-Oct-2004
• Referred By: ASTM D2050-23 - Standard Terminology Relating to Fastener Subassemblies Used in the Manufacture of Textiles
• Effective Date: 10-Jun-1998

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope include other types of touch fasteners in which the fastening
strength in the shear mode (that is, against forces applied in the
1.1 This test method measures the shear strength of hook
plane of the fastener) substantially exceeds the fastening
and loop touch (CRE) fasteners using a recording constant rate
strength in the peel mode (that is, against forces applied
of extension tensile testing machine.
perpendicular to the planes of the two components of the
1.2 This standard does not purport to address all of the
fastener).
safety concerns, if any, associated with its use. It is the
3.1.2 shear strength, n—the resistance to forces that cause,
responsibility of the user of this standard to establish appro-
or tend to cause, two contiguous parts of a body to slide
priate safety and health practices and determine the applica-
relatively to each other in a direction parallel to their plane of
bility of regulatory limitations prior to use.
contact.
1.3 The values stated in inch-pound units are to be regarded
3.1.3 For definitions of other textile terms used in this test
as the standard.
method, refer to Terminology D 123.
2. Referenced Documents
4. Summary of Test Method
2.1 ASTM Standards:
4.1 An area of hook surface is applied to an area of loop
D 76 Specification for Tensile Testing Machines for Tex-
surface with controlled engagement pressure. This combina-
tiles
tion is subjected to a dynamic shear force acting parallel to the
D 123 Terminology Relating to Textiles
surfaces of the specimens.
D 618 Practice for Conditioning Plastics and Electrical
Insulating Materials for Testing
5. Significance and Use
3. Terminology 5.1 This test method gives a measure of a key property of
hook and loop touch fasteners which is of interest to users of
3.1 Definitions:
such devices. This is a means of determining the resistance to
3.1.1 hook and loop fastener—a touch fastener, comprised
separation when forces are applied parallel to the plane of the
of two flexible mating strips, the surface of one mating strip
fastener.
being covered with tiny, stiff protrusions shaped like hooks
5.2 In the case of a dispute arising from differences in
which engage the other mating strip which is covered with
reported test results when using this test method for acceptance
pliable loops.
testing of commercial shipments, the purchaser and the sup-
3.1.1.1 Discussion—This fastener comprises a non-
plier should conduct comparative tests to determine if there is
adhesive method of joining two materials where ready adjust-
a statistical bias between their laboratories. Competent statis-
ment and removal is desirable and fastening is accomplished
tical assistance is recommended for the investigation of bias.
by pressing the mating strips together and separation is
As a minimum, the two parties should take a group of test
accomplished by simply peeling apart. Terms herein referring
specimens which are as homogenous as possible and which are
to hook and loop fastening systems shall be construed to
from a lot of hook and loop of the type in question. The test
specimens should then be randomly assigned in equal numbers
This test method is under the jurisdiction of ASTM Committee D-13 on Textiles
to each laboratory for testing. The average results from the two
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
laboratories should be compared using Student’s t-test and an
Current edition approved June 10, 1998. Published February 1999. Originally
acceptable probability level chosen by the two parties before
published as D 5169 – 91. Last previous edition D 5169 – 91.
the testing began. If a bias is found, either its cause must be
Annual Book of ASTM Standards, Vol 07.01.
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.
D5169
found and corrected or the purchaser and the supplier must mm) wide as tested, test results will not be directly propor-
agree to interpret future test results in the light of the known tional to those obtained with the 1 in. (25.4 mm) wide material.
bias. 8.1.1 Remove the outer lap of each roll before selecting the
required number of strips, hook and loop, 4 in. 6 ⁄4 in.
6. Apparatus
(102 6 6 mm) long.
6.1 Roller—consisting of a smooth steel surface, approxi- 8.1.2 Each specimen is marked with an arrow (↑) pointing
3 1
mately 4 ⁄4 in. (21 mm) in diameter, 2 ⁄4in. (57 mm) wide, and in the direction that the specimen is unwound from the roll.
equipped with a handle, length 4 ⁄8 in. (105 mm), for propelling 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 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, etc). There are
with centers in the same plane, parallel to the direction of the four (4) possible direction configurations of closure as shown
motion of the stressing clamp, and so aligned that they will in Fig. 2. The four specimens of hook and loop selected will be
hold the specimen ends wholly in the same plane; a means of used to characterize the shear strength of each of the configu-
moving the stressing clamp at a uniform rate of 12.0 6 0.5 rations.
in./min (305 6 13 mm/min); an autographic device for record-
9. Conditioning
ing the maximum load.
6.2.1 The instrument shall be calibrated to an accuracy of 9.1 Condition the specimens in an atmosphere for testing of
1.0 % of the full scale and the scale range used for the test shall 23 6 2°C (73.4°F 6 3.6°F) and 50 6 5 % relative humidity as
be such that the main test falls within 20 to 80 % of full range. described in Practice D 618 for a period of 24 h or until the
specimens reach moisture equilibrium. Lay specimens flat with
7. Sampling
the functional side up so that the cond
...