ASTM D5169-98(2021)

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: D5169 −98 (Reapproved 2021)
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 being covered with tiny, stiff protrusions shaped like hooks
which engage the other mating strip which is covered with
1.1 This test method measures the shear strength of hook
pliable loops.
and loop touch (CRE) fasteners using a recording constant rate
3.1.1.1 Discussion—This fastener comprises a non-adhesive
of extension tensile testing machine.
method of joining two materials where ready adjustment and
1.2 The values stated in inch-pound units are to be regarded
removal is desirable and fastening is accomplished by pressing
as standard. The values given in parentheses are mathematical
the mating strips together and separation is accomplished by
conversions to SI units that are provided for information only
simply peeling apart. Terms herein referring to hook and loop
and are not considered standard.
fastening systems shall be construed to include other types of
touch fasteners in which the fastening strength in the shear
1.3 This standard does not purport to address all of the
mode (that is, against forces applied in the plane of the
safety concerns, if any, associated with its use. It is the
fastener) substantially exceeds the fastening strength in the
responsibility of the user of this standard to establish appro-
peel mode (that is, against forces applied perpendicular to the
priate safety, health, and environmental practices and deter-
planes of the two components of the fastener).
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor- 3.1.2 shear strength, n—the resistance to forces that cause,
or tend to cause, two contiguous parts of a body to slide
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the relatively to each other in a direction parallel to their plane of
contact.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3.2 For definitions of other textile terms used in this test
Barriers to Trade (TBT) Committee.
method, refer to Terminology D123.
4. Summary of Test Method
2. Referenced Documents
4.1 An area of hook surface is applied to an area of loop
2.1 ASTM Standards:
surface with controlled engagement pressure. This combina-
D76/D76M Specification for Tensile Testing Machines for
tion is subjected to a dynamic shear force acting parallel to the
Textiles
surfaces of the specimens.
D123 Terminology Relating to Textiles
D618 Practice for Conditioning Plastics for Testing
5. Significance and Use
5.1 This test method gives a measure of a key property of
3. Terminology
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.
5.2 In the case of a dispute arising from differences in
reported test results when using this test method for acceptance
This test method is under the jurisdiction ofASTM Committee D13 on Textiles
testing of commercial shipments, the purchaser and the sup-
and is the direct responsibility of Subcommittee D13.54 on Subassemblies.
plier should conduct comparative tests to determine if there is
Current edition approved July 1, 2021. Published July 2021. Originally approved
a statistical bias between their laboratories. Competent statis-
in 1991. Last previous edition approved in 2015 as D5169 – 98(2015). DOI:
10.1520/D5169-98R21.
tical assistance is recommended for the investigation of bias.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
As a minimum, the two parties should take a group of test
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
specimens which are as homogenous as possible and which are
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. from a lot of hook and loop of the type in question. The test
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5169 − 98 (2021)
specimens should then be randomly assigned in equal numbers 7.4 For specification purposes, the material under test must
to each laboratory for testing.The average results from the two be mated with material supplied by the manufacturer of the
laboratories should be compared using Student’s t-test and an material being tested.
acceptable probability level chosen by the two parties before
8. Specimen Preparation
the testing began. If a bias is found, either its cause must be
8.1 Hook and loop material for this test shall be in the width
found and corrected or the purchaser and the supplier must
as supplied, not to exceed 1 in. (25.4 mm) in width. For
agree to interpret future test results in the light of the known
materials greater than 1 in. (25.4 mm), the material shall be slit
bias.
to 1 in. (25.4 mm) in width. If material is less than 1 in.
6. Apparatus (25.4 mm) wide as tested, test results will not be directly
proportional to those obtained with the 1 in. (25.4 mm) wide
6.1 Roller—consisting of a smooth steel surface, approxi-
material.
3 1
mately 4 ⁄4 in. (21 mm) in diameter, 2 ⁄4 in. (57 mm) wide, and
8.1.1 Remove the outer lap of each roll before selecting the
equippedwithahandle,length4 ⁄8in.(105mm),forpropelling
required number of strips, hook and loop, 4 in. 6 ⁄4 in.
the roller back and forth without adding additional weight to
(102 mm 6 6 mm) long.
the specimen being rolled (see Fig. 1). The weight of the roller
8.1.2 Eachspecimenismarkedwithanarrow(↑)pointingin
(including the handle) is 11 lb 6 ⁄4 lb (4994 g 6 114 g).
the direction that the specimen is unwound from the roll. This
6.2 Testing Machine—A constant rate of extension (CRE)
arrow is marked on the specimen on the leading end as it is
tensile tester shall be used. The tester shall have two clamps
unwound from the roll.The arrow (↑) indicates the direction of
with centers in the same plane, parallel to the direction of the
the hooks and loops of the specimens.
motion of the stressing clamp, and so aligned that they will
8.1.3 Select the sample consisting of the four (4) contiguous
hold the specimen ends wholly in the same plane; a means of
specimens as described in 8.1.1 and mark it with the appropri-
moving the stressing clamp at a uniform rate of 12.0 in.⁄
ate identification (roll number, lot number, date, and so forth).
min 6 0.5 in./min (305 mm⁄min 6 13 mm⁄min); an auto-
There are four (4) possible di
...