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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Users of this practice alone may use the known performance of the controls to set test end points. It is difficult to produce condensation with small chambers because the d247 differential is too slight.
Other tests may also deposit water droplets on the surface but where the source is not from condensation. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or aetm phonefaxor service astm. Position 3-dimensional specimens on a support so that the primary surface is as close to d22247 position as possible.
Three types of apparatus have been found to meet the requirements of this practice. Some tests are used for a pass or fail determination at an arbitrary time. Another option is to continue the test until all specimens have failed, sstm use the time to reach failure as a way to differentiate performance.
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. Arrange specimens so that condensate from one specimen cannot drip on other specimens.
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 sstm.
Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated.
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 aztm the humidifying tower should be approximately zstm to 14 kPa 1 to 2 psi. Primary limit control for immersion heater 6 5—Heated water tank for supplying heat and humidity to room 6—Immersion heater 7—Water temperature limit control 8—Constant level water tank unheated with over?
As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. The values given in parentheses are for information only.
Rate specimens for changes in color, blistering, etc. Link to Active This link will always d227 to the current Active version of the standard. Approved December 1, Practices D cover application techniques for the production of uniform?
Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D 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. Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated.
Four typical designs are shown in Fig. Summary of Practice 3.
2d247 standard is subject to revision at any time by the responsible technical committee and must be reviewed every? This makes this practice suitable for flat panels as well as large or 3D objects. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Specimens must be placed at a level above the water in the heating jacket to insure proper condensation.
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.
As the warmer saturated air passes the cooler specimens, water is 2d247 onto the specimens in the form of condensation. Other tests are used to monitor degree of failure as a function of exposure time.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance.
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. This makes this practice suitable for? Slotted nonmetallic supports are suitable for? Before using the exposure device to this standard for the?
Originally approved in Current edition approved Dec. It does not specify specimen preparation, or evaluation asrm results. Other tests are used to monitor degree of failure as a function of exposure time. The minimum distance between adjacent test specimens shall be mm. It does not specify specimen preparation, or evaluation of results. Primary limit control for immersion heater asm 8—Water line 9—Insulation if necessary see X1.
Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. This practice is therefore useful for evaluating coatings alone or complete coating systems.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Circulating fans should be used with caution as their use may reduce the temperature differential and limit condensation. A recovery period from 12 to 24 h is generally sufficient. Report any instances of ast, non-uniformity if they occur during the exposure.