ASTM D6490-99
(Test Method)Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels
Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels
SCOPE
1.1 This test method covers the determination of the rate at which water vapor passes through non film forming treatments, such as silanes, siloxanes and blends of silanes/siloxanes applied to cementitious substrates.
1.2 This test method covers the use of the wet cup technique, which most closely approaches the exterior conditions for use for these materials. Other conditions can be used if agreed upon between purchaser and supplier. Agreement should not be expected between results obtained by different methods or test conditions.
1.3 The values stated in SI units of measurement are designated as the standard. Factors for conversion to inch-pound units are given in and .
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:D6490–99
Standard Test Method for
Water Vapor Transmission of NonFilm Forming Treatments
Used on Cementitious Panels
This standard is issued under the fixed designation D 6490; 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 3. Summary of Test Method
1.1 This test method covers the determination of the rate at 3.1 The treated cementitious substrate is sealed to the open
whichwatervaporpassesthroughnonfilmformingtreatments, mouth of an assembly containing water with the treated side
such as silanes, siloxanes and blends of silanes/siloxanes facing the water, and the assembly placed in a test chamber
applied to cementitious substrates. with a controlled atmosphere maintained at 50 6 5 % relative
1.2 This test method covers the use of the wet cup tech- humidity at 23 6 2°C (73.5 6 3.5°F). Periodic weighings of
nique, which most closely approaches the exterior conditions the assembly are made to determine the rate of water vapor
for use for these materials. Other conditions can be used if movement through the specimen.
agreed upon between purchaser and supplier. Agreement
4. Significance and Use
should not be expected between results obtained by different
4.1 One of the factors affecting the performance provided
methods or test conditions.
1.3 The values stated in SI units of measurement are by a cementitious treatment is how readily water vapor passes
through it. Hence, the water vapor transmission characteristics
designated as the standard. Factors for conversion to inch-
pound units are given in 9.2.1.1 and 9.2.2.1. of treatments are important in assessing their performance in
practical use.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 4.2 The purpose of this test method is to obtain values of
water vapor transfer through treatments that range in perme-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- ability from high to low. These values are for use in design,
manufacture, and marketing.
bility of regulatory limitations prior to use.
4.3 Water vapor transmission is not a linear function of film
2. Referenced Documents
thickness, temperature or relative humidity.
2.1 ASTM Standards: 4.4 Values of water vapor transmission rate (WVT) and
D 823 Practices for Producing Films of Uniform Thickness water vapor permeance (WVP) can be used in the relative
of Paint, Varnish, and Related Products on Test Panels rating of treatments only if the treatments are tested under the
D 1193 Specification for Reagent Water same closely controlled conditions of temperature and relative
D 1734 Practice for Making Cementitious Panels for Test- humidity.
ing Coatings
5. Apparatus
D 3924 Specification for Standard Environment for Condi-
5.1 Assembly, consisting of a container, typically with an
tioning and Testing Paint, Varnish, Lacquer, and Related
Materials opening of approximately 75 mm (3 in.) by 150 mm (6 in.).
The depth of the dish is such that there is a 20 6 5 mm (0.8 6
E 104 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions 0.2 in.) distance between the water surface and the surface of
the under surface of the test specimen, with a water depth of at
least 5 mm (0.2 in.). The assembly should be made of a
ThesetestmethodsareunderthejurisdictionofASTMCommitteeD-1onPaint
noncorroding material, impermeable to water or water vapor in
and Related Coatings, Materials andApplications, and is the direct responsibility of
order to be found acceptable. The treated cementitious sub-
Subcommittee D01.47 on Masonry Treatments.
strate can be sealed with wax or sealant to the assembly. If the
Current edition approved Dec. 10, 1999. Published February 2000.
Annual Book of ASTM Standards, Vol 06.01.
assembly is made of aluminum, it must be anodized or given a
Annual Book of ASTM Standards, Vol 11.01.
protective clear coating to prevent corrosion.
Annual Book of ASTM Standards, Vol 06.02.
Annual Book of ASTM Standards, Vol 11.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6490
5.2 Test Chamber, with a controlled temperature and rela- 8.2 Weigh the test assemblies to 0.1 g. and place them in the
tive humidity as specified in Section 3. Air shall be circulated test chamber. Record time, temperature, and relative humidity.
throughout the chamber to maintain uniform conditions at all Unless other conditions are agreed upon between the purchaser
test locations. andtheseller,performthetest(s)inachambermaintainedat23
6 2°C (73 6 3.5°F) and 50 6 5 % relative humidity.
NOTE 1—For maintaining constant relative humidities other than those
8.2.1 In general, the test assemblies should be weighed
specified in 3.1, by means of aqueous solutions, refer to procedures
every 24 h for a period of time until the weight change per 24
outlined in Practice E 104.
h has become consistent. The time that weighings are taken
5.3 Analytical Balance, having an adequate capacity for the
should be recorded to the precision of approximately 1 % of
weightofthetestassembliesandasensitivityof10mg(0.0002
the time span between weighings. Thus, if weighings are made
lb).
every day, a time to the nearest 15 min would be allowed.
8.2.2 Treatments expected to have high WVT ratings, over
6. Reagents and Materials
6.7 metric perms (10 perms), may require weighings more
6.1 Purity of Water, unless otherwise indicated, reference to
frequently than once a day.
water shall be understood to mean reagent water conforming to
8.3 Return the test assemblies to the test chamber immedi-
Type IV of Specification D 1193.
ately after weighings.
6.2 Sealant, such as wax for attaching the coated panel
...
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