This standard is issued under the fixed designation D ; the 1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and. ASTM D Testing Water Resistance in % RH. Can be used to test the water resistance of coatings by exposing coated specimens to a high relative. ACCELERATED LIFE TESTING. Touchstone performs corrosion testing and accelerated life testing of virtually any material or device. Among the tests offered .
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Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance.
It is difficult to produce condensation with small chambers because the temperature differential is too slight. Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray.
Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day.
Circulating fans should be used with caution as their use atm reduce the temperature differential and limit condensation.
The minimum distance between adjacent test specimens shall be mm. Reverify the chamber if there are any changes to the setup of the equipment or if any of the components listed in Section 5 are repaired or replaced. Before using the exposure device to this standard for the?
A coating system is considered to pass atsm there is no evidence of water-related failure after a period of time. This practice is therefore useful for evaluating coatings alone or complete coating systems. After the specimens have been in an unopened chamber for at least 12 h, open the chamber and check for the presence of uniform condensation on each specimen.
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.
It does not specify specimen preparation, or evaluation of results. Last previous edition approved in as D — Other tests are used to monitor degree of failure as a function of exposure time. This practice is therefore useful for evaluating coatings alone or complete coating systems.
Another option is to continue the test until all specimens have failed, and use the time to reach failure aatm a way to differentiate performance. The values given in parentheses are for information only.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The post-recovery rating allows evaluation of the permanent effects of the exposure as distinct from the transient effects, and is especially important for evaluation of color and gloss.
This practice differs from other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area. Primary limit control for immersion heater 5 f2247 line 9—Insulation if necessary see X1.
If condensation is not observed on any specimen immediately after the chamber is opened, discontinue the test and determine the cause of the lack of condensation before continuing.
Other tests may also deposit water droplets on the surface but where the source is not from condensation. This practice differs from other methods where condensation is satm formed on the front coating surface, but the back surface is outside d2274 exposure area. Current edition approved Dec. One type uses a water tank with an electric immersion heater, another uses a water vapor generator, and the third type uses a submerged air distribution pipe.
A recovery period from 12 to 24 h is generally sufficient. This makes this practice suitable for flat panels as well as large or 3D objects.
The use of a large heated water tank would tend to make the temperature within the dd2247 uniform, and thus inhibit or prevent the formation of condensate on the specimens. The level of water in the heating jacket should be approximately 30 cm 12 in. 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.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This practice differs from other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area. Active view current version of standard. Any ashm such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported.
The minimum distance between adjacent specimens or between specimens and the walls of the chamber shall asym at least 30 mm.