Designation: D 2062 – 03
Standard Test Methods for
Operability of Zippers1
This standard is issued under the fixed designation D 2062; 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
1.1 These test methods cover procedures for determining
the following characteristics of zippers:
Sections
Opening and Closing of Zippers 14-17
Separator Functioning of Zippers 18-22
Sticking of Zippers at Stops 10-13
1.2 The values stated in SI units are to be regarded as the
standard.
1.3 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 appro-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards: 2
D 123 Terminology Relating to Textiles
D 2050 Terminology Relating to Zippers
D 2051 Test Method for Durability of Finish of Zippers to
Laundering
D 2052 Test Method for Colorfastness of Zippers to Dry-
cleaning
D 2053 Test Method for Colorfastness of Zippers to Light
D 2054 Test Method for Colorfastness of Zipper Tapes to
Crocking
D 2057 Test Method for Colorfastness of Zippers to Laun-
dering
D 2058 Test Method for Durability of Finish of Zippers to
Drycleaning
D 2059 Test Method for Resistance of Zippers to Salt Spray
(Fog)
D 2060 Test Methods for Measuring Zipper Dimensions
D 2061 Test Methods for Strength Tests for Zippers
3. Terminology
3.1 Definitions:
3.1.1 For definitions of zipper terms used in this standard
refer to Terminology D 2050. For definitions of other textile
terminology used in this standard refer to Terminology D 123.
4. Significance and Use
4.1 The significance of specific tests is discussed in the
appropriate sections.
4.2 These test methods are considered satisfactory for ac-
ceptance testing of commercial shipments of zippers because
the methods have been used extensively in the trade for this
purpose, even though current estimates of between-laboratory
precision are quite large in some cases.
4.2.1 If there are differences of practical significance be-
tween reported test results for two laboratories (or more),
comparative test should be performed to determine if there is a
statistical bias between them, using competent statistical assis-
tance. As a minimum, the test samples should be used that are
as homogeneous as possible, that are drawn from the material
from which the disparate test results were obtained, and that
are randomly assigned in equal numbers to each laboratory for
testing. Other materials with established test values may be
used for this purpose. The test results from the two laboratories
should be compared using a statistical test for unpaired data, at
a probability level chosen prior to the testing series. If a bias is
found, either its cause must be found and corrected, or future
test results must be adjusted in consideration of the known
bias.
4.3 The method(s) in the standard along with those in Test
Methods D 2051, D 2052, D 2053, D 2054, D 2057, D 2058,
D 2059, D 2060, and D 2061 are a collection of proven test
methods. They can be used as aids in the evaluation of zippers
without the need for a thorough knowledge of zippers. The
enumerated test methods do not provide for the evaluation of
all zipper properties. Besides those properties measured by
means of the enumerated test methods there are other proper-
ties that may be important for the satisfactory performance of
a zipper. Test methods for measuring those properties have not
been published either because no practical methods have yet
1 These test methods are under the jurisdiction of ASTM Committee D13 on
Textiles and are the direct responsibility of Subcommittee D13.54 on Subassem-
blies. The methods were developed in cooperation with the Slide Fastener Assn.,
Inc.
Current edition approved Dec. 1, 2003. Published December 2003. Originally
approved in 1961. Last previous edition approved in 1997 as D 2062 – 87 (1997).
2 For referenced ASTM standards, visit the ASTM web site, www.astm.org, or
contact ASTM Customer Service at service@astm.org. ForAnnual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM web site.
1
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
been developed or because a valid evaluation of the informa-
tion resulting from existing unpublished methods requires an
intimate and thorough knowledge of zippers.
5. Apparatus
5.1 Force Indicator3 (Fig. 1)—A 50-N or 10-lbf capacity
force indicator equipped with a direct-reading dial graduated in
0.5-N or 0.1-lbf divisions, a maximum-reading indicator, and a
clamp suitable for attaching the zipper tape ends to the
indicator.
5.2 Spacer—A piece of metal designed to fit in the pin
cavity of the fixed retainer of the specimen and having a length
equal to the element pitch of the specimen.
5.3 Hooks, suitable for attaching the force indicator to the
slider pull of a specimen.
6. Sampling
6.1 Lot Sample—As a lot sample for acceptance testing,
take at random the number of individual containers from each
shipping carton as directed in an applicable material specifi-
cation or other agreement between the purchaser and the
supplier. Consider individual containers from each shipping
carton to be the primary sampling units.
NOTE 1—An adequate specification or other agreement between the
purchaser and supplier requires taking into account the variability between
shipping cartons and between zippers in a container to provide a sampling
plan with a meaningful producer’s risk, consumer’s risk, acceptable
quality level, and limiting quality level.
6.2 Laboratory Sample and Test Specimens—As a labora-
tory sample for acceptance testing, take a number of zippers
specified in Section 6 at random from each container in the lot
sample. Consider the zippers as both the laboratory sample and
the test specimens.
7. Number of Specimens
7.1 Variables—Take a number of zippers per individual
container from each shipping carton such that the user may
expect at the 90 % probability level that the test result for an
individual container is no more than 10 % of the average above
or below the true average for the individual container. Deter-
mine the number of zippers per individual container as follows:
7.1.1 Reliable Estimate of v—When there is a reliable
estimate of v based upon extensive past records for similar
materials tested in the users laboratory as directed in the
method, calculate the number of specimens using Eq 1:
n 5 ~t2 3 v2!!/A2 5 0.0270 3 v2 (1)
where:
n = number of specimens (rounded upward to a whole
number),
v = reliable estimate of the coefficient of variation of
individual observations on similar materials in the
users laboratory under conditions of single-
operator precision,
t = 1.645, the value of student’s t for infinite degrees
of freedom, for two-sided limits, and a 90 %
probability level (t2 = 2.706),
A = 10.0 % of the average, the value of the allowable
variation, and
0.0270 = value calculated from t2/A2.
7.1.2 No Reliable Estimate of v—When there is no reliable
estimate of v for the users laboratory, Eq 1 should not be used
directly. Instead, specify the fixed numbers of specimens
shown in Table 1. These numbers of specimens are calculated
using values of v which are listed in Table 1 and which are
somewhat larger values of v than are usually found in practice.
When a reliable estimate of v for the users laboratory becomes
available, Eq 1 will usually require fewer specimens than are
listed in Table 1.
3 Drawings for the force indicator fixture shown is available from the various
zipper manufacturers upon request.
FIG. 1 Slider Sticking on Bottom Stop
TABLE 1 Specimens Required Under Conditions of Unknown
Variability in User’s Laboratory, Percent of the Average
Names of the Properties Number ofSpecimens Basis
A
Sticking at top stops 47 n = 41.3
Sticking at bottom stops 32 n = 34.4
Opening zipper 15 n = 23.4
Closing zipper 27 n = 31.1
Force to move slider, pin fully seated 43 n = 39.5
A The values of n in Table 1 are somewhat larger than will usually be found in
practice (see 7.1.2).
D 2062 – 03
2
7.2 Attribute Properties—Unless otherwise agreed upon, as
when specified in an applicable material specification, take the
fixed number of 20 specimens for detecting slider movement
with the pin partially seated or not seated.
8. Test Specimen
8.1 Each test specimen shall consist of a completely as-
sembled zipper, except that for the opening and closing
method, a length of chain with an appropriate slider may be
used. Use a zipper or chain not less than 150 mm (6 in.) long.
9. Conditioning
9.1 Specimens to be tested by the use of these methods need
no special conditioning. Testing may be conducted under
prevailing room conditions.
STICKING OF ZIPPERS AT STOPS
10. Summary of Test Method
10.1 The slider is pulled against the stops with a prescribed
force after which the force required to move the slider away
from the stops is determined.
11. Significance and Use
11.1 The slider should move away from the stops readily.
The force required to move the slider is, therefore, a measure-
ment of the serviceability of the zipper in end use applications.
12. Procedure
12.1 Top Stop:
12.1.1 Disengage any interfering slider-locking elements.
Secure the bottom tape ends of the completely assembled and
open zipper in the clamp of the force indicator as shown in Fig.
1. Locate the clamp edge approximately 10 mm (3⁄8 in.) from
the outermost edge of the bottom stop. With the force indicator
set at zero, hold the pull of the slider in a horizontal plane and
move the slider manually downward in a vertical plane against
or over the top stops until a force of 18 N (4 lbf) is registered
on the force indicator. Remove the specimen from the indicator
clamps.
12.1.2 Secure the top tape ends of the completely assembled
and closed zipper in the clamp of the force indicator. Locate the
clamp jaws 10 mm (3⁄8 in.) from the outermost component. The
tape ends must touch each other at the point of clamping.
12.1.3 Set the force indicator hand at zero. Hold the pull of
the slider in a horizontal plane and move the slider manually
downward in a vertical plane until it is clear of the top stops.
Record the maximum reading on the force indicator to the
nearest 0.5 N or 0.1 lbf.
12.2 Bottom Stop:
12.2.1 With the tape ends clamped as shown in Fig. 2, set
the force indicator at zero. Move the slider downward in a
vertical plane until it is against or over the bottom stop and
until a force of 18 N (4 lbf) is registered on the force indicator.
12.2.2 Without disturbing the slider, secure the bottom tape
ends of the specimen in the clamp of the force indicator (see
Fig. 1) approximately 10 mm (3⁄8 in.) from the outermost edge
of the bottom stop. Hold the pull of the slider in a horizontal
plane and move the slider manually downward in a vertical
plane until it is clear of the bottom stop. Note and record the
maximum reading on the force indicator to the nearest 0.5 N or
0.1 lbf.
13. Report
13.1 State that the specimens were tested as directed in
Sections 10-13 of ASTM Test Methods D 2062. Describe the
material(s) or product(s) sampled and the method of sampling
used.
13.2 Report the following information:
13.2.1 Specific property measured, that is, “sticking at top
stops”, or “sticking at bottom stops,”
13.2.2 Observed maximum force required to move the
slider from the top stops or from the bottom stops for each
specimen tested, and
13.2.3 Number of specimens tested.
OPENING AND CLOSING OF ZIPPERS
14. Summary of Test Method
14.1 Using a force indicator, the slider is pulled along the
zipper chain alternately in the opening and closing directions
and the force required to maintain each movement is recorded.
15. Significance and Use
15.1 The force required to move the slider on the chain is a
measure of the ease with which the zipper will operate in end
use applications.
FIG. 2 Slider Sticking on Top Stops
D 2062 – 03
3
--```,,,,`,``````,,`````,,,``,-`-`,,`,,`,`,,`---
16. Procedure
16.1 Opening:
16.1.1 Disengage all slider locks from the chain, except on
automatic locking sliders. Secure the top end of the completely
assembled and closed zipper or chain in the clamp of the force
indicator (see Fig. 3) so that the outermost edge of the
outermost top stop is approximately 10 mm (3⁄8 in.) from the
edge of the clamp. Hold the pull of the slider in a horizontal
plane and move the slider downward manually to a position
approximately 12 mm (0.5 in.) away from the top stops as
shown in Fig. 3.
16.1.2 In the case of a chain specimen, separate a portion of
the chain above the slider and secure it in the force indicator
clamp with the elements touching. Position the slider so that its
top is approximately 25 mm (1 in.) below the bottom edges of
the clamp.
16.1.3 Set the force indicator at zero. Holding the pull of the
slider in a horizontal position, manually move the slider
downward in a vertical plane at a uniform rate for a distance of
about 125 mm (5 in.) in approximately 3 s. Take care that the
slider does not strike the bottom stop. Record the maximum
force registered by the force indicator to the nearest 0.5 N or
0.1 lbf.
16.2 Closing—Proceed as directed in 16.1, except secure
the bottom tape ends in the force indicator clamps (see Fig. 4).
In the case of a chain specimen, it is not necessary to separate
the chain below the slider before clamping. 17. Report
17.1 State that the specimens were tested as directed in
Sections 14-17 of ASTM Test Methods D 2062. Describe the
material(s) or product(s) sampled and the method of sampling
used.
17.2 Report the following information:
17.2.1 Specific property measured, that is, to open and to
close the zipper,
17.2.2 Maximum forces required for opening zipper and for
closing zipper for each specimen tested, and
17.2.3 Number of specimens tested.
SEPARATOR FUNCTIONING OF ZIPPERS
18. Summary of Test Method
18.1 The slider, chain, and separable unit are placed in
various relationships to each other and the force required to
move the slider is determined with the aid of a force indicator.
19. Significance and Use
19.1 The slider should be capable of starting to close the
zipper at the separator unit only when the pin is properly seated
in the retainer. If the slider can close the zipper when the pin is
not properly seated, the zipper is poorly designed or assembled
and is subject to failure in the end product.
20. Procedure
20.1 Force to Move Slider, Pin Fully Seated—Separate the
two stringers of the zipper specimen. Hold the stringer to
which the retainer is attached in a vertical position (with theFIG. 3 Chain Opening
FIG. 4 Chain Closing
D 2062 – 03
4
--```,,,,`,``````,,`````,,,``,-`-`,,`,,`,`,,`---
right hand). Place the slider in the normal position abutting the
retainer (with the left hand) as shown in Fig. 5. Insert the pin
through the slider throat and hold it in the fully-seated position.
Attach the force indicator to the pull of the slider as shown in
Fig. 5. Apply force to the slider in the closing direction until the
slider clears the separable unit. Record the maximum reading
on the force indicator to the nearest 0.5 N or 0.1 lbf.
20.2 Slider Movement, Pin Partially Seated—Separate the
specimen into its two stringers. Hold the stringer to which the
retainer is attached in a vertical position with the right hand.
Place the slider in the normal position abutting the retainer.
Place a spacer having a thickness equivalent to the element
pitch of the zipper being tested in the bottom of the pin cavity
of the retainer. Insert the pin through the throat of the slider and
hold it with the left hand in the fully-seated position against the
spacer as shown in Fig. 6. Attach the force indicator to the
slider pull as shown in Fig. 6. Apply a force not to exceed the
amount agreed upon by the purchaser and the seller to the
slider in the closing direction. If closing occurs, note and
record the maximum force required to the nearest 0.5 N or 0.1
lbf.
20.3 Slider Movement, Pin Not Seated—Separate the two
stringers of the specimen. Hold the stringer to which the
retainer is attached in a vertical position with the right hand.
Place the slider approximately 50 mm (2 in.) below the retainer
as shown in Fig. 7. Insert the pin into the throat of the slider
until the pin is abutted against the element pitch in the slider.
Hold the pin end firmly with the left hand as shown in Fig. 7
and, using the force indicator, apply a force not to exceed the
amount agreed upon by the purchaser and the seller to the
slider in the closing direction. If closing occurs, record the
maximum force required to the nearest 0.5 N or 0.1 lbf.
21. Report
21.1 State that the specimens were tested as directed in
Sections 18-22 of ASTM Test Methods D 2062. Describe the
material(s) or product(s) sampled and the method of sampling
used.
21.2 Report the following information:
21.2.1 Specify property measured, that is, force to move
slider, pin fully seated, slider movement, pin partially seated or
slider movement, pin not seated,
21.2.2 Force applied on each specimen and whether or not
slider movement occurred, and
21.2.3 Number of specimens tested.
22. Precision and Bias
22.1 Interlaboratory Test Data4—An interlaboratory test
was run in 1970 in which samples of two materials were tested
4 ASTM Research Report No. D13-1035. A copy is available from ASTM
Headquarters, 100 Barr Harbor Drive, West Conshohocken, PA 19428.FIG. 5 Pin Fully Seated in Retainer
FIG. 6 Pin Not Fully Inserted in Retainer
FIG. 7 Pin Not in Retainer
TABLE 2 Components of Variance as Coefficients of Variation,
Percent of the Average
Names of
the Properties
Single-
Operator
Component
Within-
Laboratory
Component
Between-
Laboratory
Component
Sticking at top stops 29.5 19.9 32.6
Sticking at bottom stops 24.6 12.7 13.4
Opening zipper 16.7 0.000 0.000
Closing zipper 22.2 23.4 32.6
Force to move slider, pin
fully seated
28.2 0.000 0.000
D 2062 – 03
5
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in each of four laboratories. Each laboratory used two opera-
tors, each of whom tested eight specimens of each material.
The components of variance expressed as coefficients of
variations were calculated to be the values listed in Table 2.
NOTE 2—When the pin is not fully seated in the retainer or is not seated
in the retainer, the movement of the slider under a specified load
constitutes a failure of the specimen to conform. Such an observation is an
attribute and no justifiable statement on precision or bias may be made
about observations of this type.
NOTE 3—All of the within-laboratory component is attributable to
variations in observations by the same operator obtained on different days.
22.2 Precision—For the components of variance listed in
Table 2, two averages of observed values should be considered
significantly different at the 90 % probability level if the
difference equals or exceeds the critical differences tabulated in
Table 3.
NOTE 4—The tabulated values of the critical differences should be
considered to be a general statement, particularly with respect to between-
laboratory precision. Before a meaningful statement can be made about
two specific laboratories, the amount of statistical bias, if any, between
them must be established, with each comparison being based on recent
data obtained on randomized specimens from one sample of the material
to be tested.
22.3 Bias—The procedures in Test Methods D 2062 for
testing the pr
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