ASTM D3833/D3833M-96(2006)
(Test Method)Standard Test Method for Water Vapor Transmission of Pressure-Sensitive Tapes
Standard Test Method for Water Vapor Transmission of Pressure-Sensitive Tapes
SIGNIFICANCE AND USE
The results of this test method will indicate the relative permeability by water vapor of the tape through its smallest dimension (generally normal to the tape’backing).
5.1.1 The pathway for the water vapor parallel to the adhesive-cup interface is great compared to the tape’thickness and the latter is usually the nearly exclusive source of transmitted vapor.
5.1.2 Some tape types allow a relatively free path in a direction normal to the backing or along backing pathways parallel to the adhesive-cup interface allowing the adhesive to become the principal barrier.
If the adhesive does not continue to adhere to the cup flange during the exposure periods allowing unintended pathways for water vapor to occur, the measurement should be considered as not having been made. Consequently, the tape might be considered as being inappropriate for use on surfaces like the cup flange under moisture conditions approximating those of the test.
Note 1—It may be that the interest is simply in the tape material as a water vapor barrier. In this case, how well the tape adheres to the cup flange may be of little consequence, and steps to prevent any edge effects are in order. These are referred to in Section 10.
SCOPE
1.1 This test method covers one procedure for measuring the water vapor transmission rate of pressure-sensitive tape.
1.2 The values stated in either SI or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system must be used independently, without combining values in any way.
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.
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Designation:D3833/D3833M–96 (Reapproved 2006)
Standard Test Method for
Water Vapor Transmission of Pressure-Sensitive Tapes
This standard is issued under the fixed designation D3833/D3833M; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope exposure. The gain in weight is used to calculate the water
vapor transmission rate (WVTR).
1.1 This test method covers one procedure for measuring
the water vapor transmission rate of pressure-sensitive tape.
5. Significance and Use
1.2 The values stated in either SI or inch-pound units are to
5.1 The results of this test method will indicate the relative
be regarded separately as standard. The values stated in each
permeability by water vapor of the tape through its smallest
system may not be exact equivalents; therefore, each system
dimension (generally normal to the tape’s backing).
must be used independently, without combining values in any
5.1.1 The pathway for the water vapor parallel to the
way.
adhesive-cup interface is great compared to the tape’s thick-
1.3 This standard does not purport to address all of the
ness and the latter is usually the nearly exclusive source of
safety concerns, if any, associated with its use. It is the
transmitted vapor.
responsibility of the user of this standard to establish appro-
5.1.2 Some tape types allow a relatively free path in a
priate safety and health practices and determine the applica-
direction normal to the backing or along backing pathways
bility of regulatory limitations prior to use.
parallel to the adhesive-cup interface allowing the adhesive to
2. Referenced Documents become the principal barrier.
5.2 If the adhesive does not continue to adhere to the cup
2.1 ASTM Standards:
flange during the exposure periods allowing unintended path-
D996 Terminology of Packaging and Distribution Environ-
ways for water vapor to occur, the measurement should be
ments
considered as not having been made. Consequently, the tape
D3715/D3715M Practice for Quality Assurance of
might be considered as being inappropriate for use on surfaces
Pressure-Sensitive Tapes
like the cup flange under moisture conditions approximating
D4332 Practice for Conditioning Containers, Packages, or
those of the test.
Packaging Components for Testing
E96/E96M Test Methods for Water Vapor Transmission of
NOTE 1—It may be that the interest is simply in the tape material as a
Materials
water vapor barrier. In this case, how well the tape adheres to the cup
flange may be of little consequence, and steps to prevent any edge effects
E122 Practice for Calculating Sample Size to Estimate,
are in order. These are referred to in Section 10.
With Specified Precision, the Average for a Characteristic
of a Lot or Process
6. Apparatus
3. Terminology 6.1 Test Cups, made from materials that are nonhygro-
scopic. The cup shall have a zero WVTR. The cups shall be
3.1 Definitions—General terms in this test method are
rectangular with a flat, smooth, rigid flange, and shall have the
defined in Terminology D996.
following dimensions:
4. Summary of Test Method
Flange:
Outside–50.8 by 152.4 60.5mm[2.0by6.0 6 0.02 in.]
4.1 The pressure-sensitive tape is secured by its adhesive to
Inside (opening)–25.4 by 101.6 60.5mm[1.0by4.0 6 0.02 in.]
a test cup containing a desiccant. The assembly is exposed to
Body:
Inside–25.4 by 101.6 by 38.1 (depth) 6 0.5 mm [1.0 by 4.0 by 1.5 (depth) 6
a controlled atmosphere and weighed after two intervals of that
0.02 in.]
This test method is under the jurisdiction of ASTM Committee D10 on
Packaging and is the direct responsibility of Subcommittee D10.14 on Tape and The sole source of supply of the apparatus known to the committee at this time
Labels. is Chemsultants International, 9349 Hamilton Dr., Mentor, OH 44061–1118. If you
Current edition approved April 1, 2006. Published April 2006. Originally are aware of alternative suppliers, please provide this information to ASTM
approved in 1979. Last previous edition approved in 2001 as D3833/D3833M – 96 International Headquarters. Your comments will receive careful consideration at a
(2001). DOI: 10.1520/D3833_D3833M-96R06. meeting of the responsible technical committee, which you may attend.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3833/D3833M–96 (2006)
The mass shall not exceed 80 % of the balance capacity used surface of the tape backing, a sealing material such as
in weighing. aluminum foil-backed pressure-sensitive tape can provide
6.2 Calcium Chloride, anhydrous, passing a No. 8 (2.36- assurance that only the 25.4 by 101.6-mm [1.0 by 4.0-in.] area
mm) sieve. at the flange opening is exposed and all edges are covered.
10.4 Prepare the remaining assemblies in the same way as
NOTE 2—Regenerate calcium chloride to a sufficiently anhydrous state
the first.
by heating it for2hat approximately 200°C [392°F].
10.5 Place the assemblies into the test chamber for approxi-
6.3 Test Chamber, controlled at 90 to 95 % relative humid-
mately a 24-h period, remove, cool for 15 min to the weighing
ity at 38 6 1°C [100.0 6 2.0°F]. The air shall be circulated
conditions, and weigh to the nearest 5 mg. This will be W for
within the chamber to provide uniform conditions for all
the equation in Section 11.
specimens and shall give no visible condensation on the test
10.5.1 For materials with an expected WVTR of 40
cups. 2 2
g/m [2.5 g/100 in. ] in 24 h or less, return the assemblies to
6.4 Balance, accurate to 61 mg.
the test chamber for 72 h following the initial weighing.
Remove and cool them to the weighing conditions for 15 min
7. Sampling
and weigh again to the nearest 5 mg. Use this as W for the
7.1 Acceptance Sampling—Sampling shall be in accor
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