ASTM D1735-04
(Practice)Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
SIGNIFICANCE AND USE
Water can cause the degradation of coatings, so knowledge of how a coating resists water is helpful in predicting its service life. Failure in water fog tests may be caused by a number of factors, including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. The test is therefore useful for evaluating coatings alone or complete coating systems.
Water fog tests are used for research and development of coatings and substrate treatments, specification acceptance, and quality control in manufacturing. These tests usually result in a pass or fail determination, but the degree of failure may also be measured. A coating system is considered to pass if there is no evidence of water-related failure after a specified period of time.
Results obtained from the use of water fog tests in accordance with this practice should not be represented as being equivalent to a period of exposure to water in the natural environment, until the degree of quantitative correlation has been established for the coating or coating system.
The test apparatus is similar to that used in Practice B 117, and the conversion of the apparatus from salt spray to water fog testing is feasible. Care should be taken to remove all traces of the salt from the cabinet and reservoir when converting from salt spray to water fog testing.
SCOPE
1.1 This practice covers the basic principles and operating procedures for testing water resistance of coatings in an apparatus similar to that used for salt spray testing.
1.2 This practice is limited to the methods of obtaining, measuring, and controlling the conditions and procedures of water fog tests. It does not specify specimen preparation, specific test conditions, or evaluation of results.
Note 1—Alternative practices for testing the water resistance of coatings include Practices D 870, D 2247, and D 4585.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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Designation:D1735–04
Standard Practice for
Testing Water Resistance of Coatings Using Water Fog
1
Apparatus
This standard is issued under the fixed designation D 1735; 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 D 714 Test Method for Evaluating Degree of Blistering of
Paints
1.1 This practice covers the basic principles and operating
D 823 Practices for Producing Films of Uniform Thickness
procedures for testing water resistance of coatings in an
of Paint, Varnish, and Related Products on Test Panels
apparatus similar to that used for salt spray testing.
D 870 Practice for Testing Water Resistance of Coatings
1.2 This practice is limited to the methods of obtaining,
Using Water Immersion
measuring, and controlling the conditions and procedures of
D 1193 Specification for Reagent Water
water fog tests. It does not specify specimen preparation,
D 1654 Test Method for Evaluation of Painted or Coated
specific test conditions, or evaluation of results.
Specimens Subjected to Corrosive Environments
NOTE 1—Alternative practices for testing the water resistance of
D 1730 Practices for Preparation of Aluminum and
coatings include Practices D 870, D 2247, and D 4585.
Aluminum-Alloy Surfaces for Painting
1.3 The values stated in SI units are to be regarded as the
D 2247 PracticeforTestingWaterResistanceofCoatingsin
standard. The values given in parentheses are for information
100 % Relative Humidity
only.
D 2616 Test Method for Evaluation of Visual Color Differ-
1.4 This standard does not purport to address all of the
ence With a Gray Scale
safety concerns, if any, associated with its use. It is the
D 3359 Test Methods for MeasuringAdhesion by Tape Test
responsibility of whoever uses this standard to consult and
D 3363 Test Method for Film Hardness by Pencil Test
establish appropriate safety and health practices and deter-
D 4541 Test Method for Pull-Off Strength of Coatings
mine the applicability of regulatory limitations prior to use.
Using Portable Adhesion Testers
D 4585 Practice for Testing Water Resistance of Coatings
2. Referenced Documents
Using Controlled Condensation
2
2.1 ASTM Standards:
3. Summary of Practice
B117 Practice for Operating Salt Spray (Fog) Apparatus
D 609 Practice for Preparation of Cold-Rolled Steel Panels
3.1 Coated specimens are placed in an enclosed chamber to
for Testing Paint, Varnish, Conversion Coatings, and
permitfreesettlingoffogonallspecimens.Thetemperatureof
Related Coating Products
the chamber is usually maintained at 38°C (100°F). The
D 610 Test Method for Evaluating Degree of Rusting on
exposure condition is varied by selecting the duration of the
Painted Steel Surfaces
test. Water permeates the coating at rates that are dependent
upon the characteristics of the coating. Any effects such as
color change, blisters, loss of adhesion, softening, or embrittle-
1
This practice is under the jurisdiction of ASTM Committee D01 on Paint and
ment are observed and reported.
Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.27 on Accelerated Testing.
4. Significance and Use
Current edition approved Nov. 1, 2004. Published December 2004. Originally
approved in 1960. Last previous edition approved in 2002 as D 1735 – 02.
4.1 Water can cause the degradation of coatings, so knowl-
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
edge of how a coating resists water is helpful in predicting its
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
service life. Failure in water fog tests may be caused by a
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. number of factors, including a deficiency in the coating itself,
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D1735–04
contamination of the substrate, or inadequate surface prepara- sure to the fog. A minimum spacing between specimens of 30
tion. The test is therefore useful for evaluating coatings alone mm is recommended.Arrange the specimens so that the water
or complete coating systems. from one specimen does not drip on other specimens.
4.2 Waterfogtestsareusedforresearchanddevelopmentof
7.4 Place two containers within the chamber to collect fog
coatingsandsubstratetreatments,specificationacceptance,and
for measurement. Use collectors that have approximately the
quality cont
...
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