Standard Test Method for Water Vapor Transmission of Pressure-Sensitive Tapes

SCOPE
1.1 This test method provides 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.
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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Status
Historical
Publication Date
09-Mar-1996
Technical Committee
Drafting Committee
Current Stage
Ref Project

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ASTM D3833/D3833M-96(2001) - Standard Test Method for Water Vapor Transmission of Pressure-Sensitive Tapes
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D3833/D3833M–96 (Reapproved 2001)
Standard Test Method for
Water Vapor Transmission of Pressure-Sensitive Tapes
This standard is issued under the fixed designation D 3833/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 (e) 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 a controlled atmosphere and weighed after two intervals of that
exposure. The gain in weight is used to calculate the water
1.1 This test method provides one procedure for measuring
vapor transmission rate (WVTR).
the water vapor transmission rate of pressure-sensitive tape.
1.2 The values stated in either SI or inch-pound units are to
5. Significance and Use
be regarded separately as standard. The values stated in each
5.1 The results of this test method will indicate the relative
system may not be exact equivalents; therefore, each system
permeability by water vapor of the tape through its smallest
must be used independently, without combining values in any
dimension (generally normal to the tape’s backing).
way.
5.1.1 The pathway for the water vapor parallel to the
1.3 This standard does not purport to address all of the
adhesive-cup interface is great compared to the tape’s thick-
safety concerns, if any, associated with its use. It is the
ness and the latter is usually the nearly exclusive source of
responsibility of the user of this standard to establish appro-
transmitted vapor.
priate safety and health practices and determine the applica-
5.1.2 Some tape types allow a relatively free path in a
bility of regulatory limitations prior to use.
direction normal to the backing or along backing pathways
2. Referenced Documents parallel to the adhesive-cup interface allowing the adhesive to
become the principal barrier.
2.1 ASTM Standards:
5.2 If the adhesive does not continue to adhere to the cup
D 996 Terminology of Packaging and Distribution Environ-
flange during the exposure periods allowing unintended path-
ments
ways for water vapor to occur, the measurement should be
D 3715/D3715M Practice for Quality Assurance of
considered as not having been made. Consequently, the tape
Pressure-Sensitive Tapes
might be considered as being inappropriate for use on surfaces
D 4332 Practice for Conditioning Containers, Packages, or
like the cup flange under moisture conditions approximating
Packaging Components for Testing
those of the test.
E 96 Test Methods for Water Vapor Transmission of Mate-
rials
NOTE 1—It may be that the interest is simply in the tape material as a
E 122 Practice for Calculating Sample Size to Estimate, 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
With a Specified Tolerable Error, the Average for a
are in order. These are referred to in Section 10.
Characteristic of a Lot or Process
6. Apparatus
3. Terminology
6.1 Test Cups , made from materials that are nonhygro-
3.1 Definitions—General terms in this test method are
scopic. The cup shall have a zero WVTR. The cups shall be
defined in Terminology D 996.
rectangular with a flat, smooth, rigid flange, and shall have the
4. Summary of Test Method following dimensions:
Flange:
4.1 The pressure-sensitive tape is secured by its adhesive to
Outside–50.8 by 152.4 60.5mm[2.0by6.0 6 0.02 in.]
a test cup containing a desiccant. The assembly is exposed to
Inside (opening)–25.4 by 101.6 60.5mm[1.0by4.0 6 0.02 in.]
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
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 mass shall not exceed 80 % of the balance capacity used
Labels.
in weighing.
Current edition approved March 10, 1996. Published May 1996. Originally
e1
published as D 3833 – 79. Last previous edition D 3833 – 88 (1993) .
Annual Book of ASTM Standards, Vol 15.09.
3 5
Annual Book of ASTM Standards, Vol 04.06. Available from Chemsultants International, 9349 Hamilton Dr., Mentor, OH
Annual Book of ASTM Standards, Vol 14.02. 44061–1118.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D3833/D3833M
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 the
6.4 Balance, accurate to 61 mg.
test chamber for 72 h following the initial weighing. Remove
andcoolthemtotheweighingconditionsfor15minandweigh
7. Sampling
again to the nearest 5 mg. Use this as W for the equation in
7.1 Acceptance Sampling—Sampling shall be in accordance
Section 11.
with Practice D 3715/D 3715M.
10.5.2 For materials with an expected WVTR greater than
2 2
7.2 Sampling for Othe
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