ASTM-D4585 2007(Redline)

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D4585-07 Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation (Redline)

Published By	Publication Date	Number of Pages
ASTM	2007	4

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Description

Significance and Use

Water can cause degradation of coatings, so knowledge of how a coating resists water is helpful in predicting its service life. Failure in a condensation test 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.

Condensation tests of coatings are used for specification acceptance, quality control, and research and development of coatings and substrate treatments. These tests usually result in a pass or fail determination but the degree of failure also may 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 condensation 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 is usually conducted on metal, plastics, or wood specimens with the coating facing the inside of the chamber. However, it is possible to test the blister resistance of house paints on wood specimens by mounting the uncoated wood surface facing the inside of the chamber.

This practice can be used for corrosion tests particularly if the specimens are periodically dried. While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens.

1. Scope

1.1 This practice covers basic principles and operating procedures for testing water resistance of coatings using controlled condensation. Condensation is produced by exposing one surface of a coated specimen to a heated, saturated mixture of air and water vapor, while the reverse side of the specimen is exposed to the cooling effect of room temperature air. This practice is derived from research of the Cleveland Society for Coatings Technology.

1.2 This practice is limited to the methods of obtaining, measuring, and controlling conditions and procedures of controlled condensation tests. It does not specify specimen preparation, specific test conditions, or evaluation of results. Note 1 – Alternative practices for testing water resistance of coatings include Practices D 870, D 1735, and D 2247.

1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D609 Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces D714 Test Method for Evaluating Degree of Blistering of Paints D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels D870 Practice for Testing Water Resistance of Coatings Using Water Immersion D1654 Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments D1730 Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting D1735 Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus D2247 Practice for Testing Water Resistance of Coatings in 100 % Relative Humidity D2616 Test Method for Evaluation of Visual Color Difference With a Gray Scale D3359 Test Methods for Measuring Adhesion by Tape Test D3363 Test Method for Film Hardness by Pencil Test D4541 Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers G154 Practice for Operating Fluorescent Light Apparatus for UV Exposure of Nonmetallic Materials

Keywords

adhesion; blistering; condensation; humidity; resistance-water; rust;

ICS Code

ICS Number Code 87.040 (Paints and varnishes)

DOI: 10.1520/D4585-07 ASTM International is a member of CrossRef.

ASTM D4585 (Paint and Related Coating Standards)

Citing ASTM Standards

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Additional information

Standard Title	D4585-07 Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation (Redline)
Published Code	ASTM
Publication Date	2007
Pages Count	4

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ASTM-D4585 2007(Redline)

ASTM D4585 (Paint and Related Coating Standards)

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