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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This is a requirement in order for this procedure to work correctly. Material used for supports shall be of sufficient stiffness so that they do not distort or sag during prolonged use. As the warmer saturated air r2247 the cooler specimens, water is deposited onto the specimens in the form of condensation. Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible.
Specimens must be placed at a level above the water in the heating jacket to insure proper condensation.
Polyvinyl chloride pipe and? Some tests are used for a pass or fail determination at an arbitrary time. If condensation is not observed on any specimen immediately after the chamber is opened, discontinue the test and determine the cause of the lack aztm condensation before continuing.
Active view current version of standard. Such control specimens can provide warning of changes in test severity in a given apparatus, and can indicate variations in test severity between asm apparatuses. Specimens used for chamber veri? This practice is therefore useful for evaluating coatings alone or complete coating systems. Practices D cover application techniques for the production of uniform?
If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area. A recovery period from 12 to 24 h is generally sufficient.
Individual reprints single or multiple copies of this standard may be obtained by contacting Asym at the above address or qstm phonefaxor service astm. The use of control specimens with known performance can also be used to determine the duration of the test that is required to produce meaningful results.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Rate specimens for changes in color, blistering, etc. It may be necessary to avoid placing specimens in the lower portion of the chamber as the temperature differentials at the lower levels may be too small to induce condensation.
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.
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. 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.
Reverify the chamber if there are any changes to the setup of the equipment or if any of the awtm listed in Section 5 are repaired or replaced. The saturated mixture of water vapor and air temperature rises and then cools below the dew point, causing condensation on the specimens.
The values given in parentheses are for information only. It does not specify specimen preparation, or evaluation of results. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
The level of water in the heating jacket should be approximately 30 cm 12 in. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.
Circulating fans should be used with caution as their use may reduce the temperature differential and limit condensation. Other tests are used to monitor degree of failure as a function of exposure time.
Water permeates the coating at rates that are dependent upon the characteristics of the coating. Approved December 1, Other tests may also deposit water droplets on the surface but where the source is not from condensation zstm example, water spray.
This practice is therefore useful for evaluating coatings alone or complete coating systems. 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.
Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Last previous edition approved in as D — Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day. Primary limit control for immersion heater 6 5—Heated water tank d227 supplying heat and humidity to room 6—Immersion heater 7—Water temperature limit control 8—Constant level water tank unheated with over?
Originally approved in Summary of Practice 3.