ASTM D870-15
Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
- Standard No.
- ASTM D870-15
- Release Date
- 2015
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM D870-15(2020)
- Latest
- ASTM D870-15(2020)
- Scope
4.1 Immersion in water can cause the degradation of coatings. Knowledge on how a coating resists water immersion is helpful in predicting its service life. Failure in a water immersion 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.
4.2 Water immersion tests are used for research and development of coatings and substrate treatments, specification acceptance, and quality control in manufacturing. These tests typically 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.
4.3 Results obtained from water immersion 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.
4.4 Corrosion tests of a scribed coating on a ferrous substrate are impractical in water immersion tests as the corrosion products tend to contaminate the water bath. Continuous overflow of the test tank is sometimes required to maintain consistent water quality.
4.5 The apparatus for the test is relatively inexpensive and can be as simple as a glass beaker with a stirrer. It is also possible to use very large tanks for testing coated pipe or other large coated products.
1.1 This practice covers the basic principles and operating procedures for testing water resistance of coatings by the partial or complete immersion of coated specimens in distilled or de-mineralized water at ambient or elevated temperatures. Although the apparatus and procedure could be employed in immersion tests using solutions of various materials in water, this practice is limited to tests in water alone.
1.2 This practice is limited to the methods of obtaining, measuring, and controlling the conditions and procedures of water immersion 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 D1735, D2247, and D4585.
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 the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D870-15 Referenced Document
- ASTM D1193 Standard Specification for Reagent Water
- ASTM D1654 Standard Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments
- ASTM D1730 Standard Practices for Preparation of Aluminum and Aluminum-Alloy Surfaces for Painting
- ASTM D1735 Standard Practice for Testing Water Resistance of Coatings Using Water Fog Apparatus
- ASTM D2247 Standard Practice for Testing Water Resistance of Coatings in 100% Relative Humidity
- ASTM D2616 Standard Test Method for Evaluation of Visual Color Difference With a Gray Scale
- ASTM D3359 Standard Test Methods for Measuring Adhesion by Tape Test
- ASTM D3363 Standard Test Method for Film Hardness by Pencil Test
- ASTM D4541 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
- ASTM D4585 Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation
- ASTM D609 Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Paint, Varnish, Conversion Coatings, and Related Coating Products
- ASTM D610 Standard Test Method for Evaluating Degree of Rusting on Painted Steel Surfaces
- ASTM D714 Standard Test Method for Evaluating Degree of Blistering of Paints
- ASTM D823 Standard Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels
ASTM D870-15 history
- 2020 ASTM D870-15(2020) Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
- 2015 ASTM D870-15 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
- 2009 ASTM D870-09 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
- 2002 ASTM D870-02 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
- 1997 ASTM D870-97 Standard Practice for Testing Water Resistance of Coatings Using Water Immersion
