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ASTM D6490-99(2006)

(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

SIGNIFICANCE AND USE
One of the factors affecting the performance provided by a cementitious treatment is how readily water vapor passes through it. Hence, the water vapor transmission characteristics of treatments are important in assessing their performance in practical use.
The purpose of this test method is to obtain values of water vapor transfer through treatments that range in permeability from high to low. These values are for use in design, manufacture, and marketing.
Water vapor transmission is not a linear function of film thickness, temperature or relative humidity.
Values of water vapor transmission rate (WVT) and water vapor permeance (WVP) can be used in the relative rating of treatments only if the treatments are tested under the same closely controlled conditions of temperature and relative humidity.
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 9.2.1.1 and 9.2.2.1.
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.

General Information

Status
Historical
Publication Date
31-May-2006
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.47 - Concrete, Stone and Masonry Treatments
Current Stage
Ref Project

Relations

Replaces
ASTM D6490-99 - Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels
Effective Date
01-Jun-2006

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ASTM D6490-99(2006) - Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious PanelsASTM D6490-99(2006) - Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels
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ASTM D6490-99(2006) - Standard Test Method for Water Vapor Transmission of NonFilm Forming Treatments Used on Cementitious Panels
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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: D6490 − 99 (Reapproved 2006)
Standard Test Method for
Water Vapor Transmission of NonFilm Forming Treatments
1
Used on Cementitious Panels
This standard is issued under the fixed designation D6490; 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 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 humidity at 23 6 2°C (73.5 6 3.5°F). Periodic weighings of
technique, which most closely approaches the exterior condi- the assembly are made to determine the rate of water vapor
tions for use for these materials. Other conditions can be used movement through the specimen.
if agreed upon between purchaser and supplier. Agreement
should not be expected between results obtained by different
4. Significance and Use
methods or test conditions.
4.1 One of the factors affecting the performance provided
1.3 The values stated in SI units of measurement are
by a cementitious treatment is how readily water vapor passes
designated as the standard. Factors for conversion to inch-
through it. Hence, the water vapor transmission characteristics
pound units are given in 9.2.1.1 and 9.2.2.1.
of treatments are important in assessing their performance in
1.4 This standard does not purport to address all of the
practical use.
safety concerns, if any, associated with its use. It is the
4.2 The purpose of this test method is to obtain values of
responsibility of the user of this standard to establish appro-
water vapor transfer through treatments that range in perme-
priate safety and health practices and determine the applica-
ability from high to low. These values are for use in design,
bility of regulatory limitations prior to use.
manufacture, and marketing.
2. Referenced Documents
4.3 Water vapor transmission is not a linear function of film
2
thickness, temperature or relative humidity.
2.1 ASTM Standards:
D823 Practices for Producing Films of Uniform Thickness
4.4 Values of water vapor transmission rate (WVT) and
of Paint, Varnish, and Related Products on Test Panels
water vapor permeance (WVP) can be used in the relative
D1193 Specification for Reagent Water
rating of treatments only if the treatments are tested under the
D1734 Practice for Making Cementitious Panels for Testing
same closely controlled conditions of temperature and relative
Coatings
humidity.
D3924 Specification for Environment for Conditioning and
Testing Paint, Varnish, Lacquer, and Related Materials
5. Apparatus
E104 Practice for Maintaining Constant Relative Humidity
by Means of Aqueous Solutions
5.1 Assembly, consisting of a container, typically with an
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
1
0.2 in.) distance between the water surface and the surface of
This test method is under the jurisdiction of ASTM Committee D01 on Paint
and Related Coatings, Materials, andApplications and is the direct responsibility of
the under surface of the test specimen, with a water depth of at
Subcommittee D01.47 on Concrete, Stone and Masonry Treatments.
least 5 mm (0.2 in.). The assembly should be made of a
Current edition approved June 1, 2006. Published June 2006. Originally
noncorroding material, impermeable to water or water vapor in
approved in 1999. Last previous edition approved in 1999 as D6490 - 99. DOI:
10.1520/D6490-99R06.
order to be found acceptable. The treated cementitious sub-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
strate can be sealed with wax or sealant to the assembly. If the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
assembly is made of aluminum, it must be anodized or given a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. protective clear coating to prevent corrosion.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D6490 − 99 ( 2006)
TABLE 1 Saturation Vapor Pressure
5.2 TestChamber,withacontrolledtemperatureandrelative
humidity as specifi
...

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