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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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Users of this practice alone may use the known performance of the controls to set test end points. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The level of water in the heating jacket should be approximately 30 cm 12 in. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
The saturated mixture of water vapor d2274 air temperature rises and then cools below the dew point, causing condensation on the specimens.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
A recovery period from 12 to 24 h is generally sufficient. Your comments will receive careful consideration at a meeting of the d2247 technical committee, which you may attend.
Originally approved in 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. The values given in parentheses are for information only.
If more than one replicate specimen is exposed, place the replicates in different locations adtm the exposure area. Such control specimens can provide warning of changes in test severity zstm a given apparatus, and can indicate variations in test severity between different apparatuses. 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.
Air pressure to the humidifying tower should be approximately 7 to 14 kPa 1 to 2 psi. Circulating fans should be used with caution as their use may reduce the temperature differential and limit condensation.
Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no d224 than once each day.
It does not specify specimen preparation, or evaluation of results. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Three types of apparatus have been found to meet the requirements of this practice.
This practice is therefore useful for evaluating coatings alone or complete coating systems. Arrange specimens so that condensate from one specimen cannot drip adtm other specimens.
Link to Active This link will always route to the current Active version of the standard. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. This is a requirement in order for this procedure to work correctly.
This standard has been approved for use by agencies of the U. Slotted nonmetallic supports are suitable for? As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Operate the test continuously with the test chamber closed unless otherwise speci?
The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. 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. Last previous edition approved in as D — Evaluate specimens no less than 5 min and no more than 10 min after removal from test, as the effects from water exposure can change within a short time.
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. Summary of Practice 3. 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 does not specify specimen preparation, or evaluation of results.