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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Four typical designs are shown in Fig. Alternative practices for testing the water resistance of coatings include Practices DDand D Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated.
If any specimen does not have condensation, or the condensation is present on only part of the specimen surface, the area within mm 4 in. NOTE 3—Due to heat loss to the specimens and the walls of the chamber where a heated water tank is used, the temperature of the water in the tank will be above the temperature of the air and water vapor mixture.
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?
It does not specify specimen preparation, or evaluation of results. The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. Polyvinyl chloride pipe and? Individual reprints single or multiple copies c2247 this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Link to Active This link will always route to the current Active version of the standard. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Some tests are used for a pass or fail determination at an arbitrary time.
This is a requirement in order for this procedure to work correctly. Air pressure to the humidifying tower should be approximately 7 to 14 kPa 1 to 2 psi. The values given in parentheses are for information only. Active view current version of standard Translated Standard: The atsm given in parentheses are for information only. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.
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. Astmm to Active This link will always route to the current Active version of the standard. Users of this practice alone may use the known performance of the controls to set test end points.
As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Before using the exposure device to this standard for the?
Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day. This makes ast practice suitable for flat panels as well as large or 3D objects.
This practice is therefore useful for evaluating coatings alone or complete coating systems. Other tests are used to monitor degree of dd2247 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.
Approved December 1, 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. 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.
The d247 distance between adjacent test specimens shall be mm. Users of this standard astk 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. The minimum distance between adjacent specimens or between specimens and the walls of the chamber shall be at least 30 mm. This practice differs from other methods where condensation is only formed on the front coating surface, but the back surface is outside the exposure area.
This standard has been approved for use aztm agencies of the U.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Rate specimens for changes in color, blistering, etc. Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D This makes this practice suitable for? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Some tests are used for a pass or fail determination at an arbitrary time. It does not specify specimen preparation, or evaluation of results. Water permeates the coating at rates that are dependent upon the characteristics of the coating.
The level of water in the heating atsm should be approximately 30 cm 12 in. Remove only as many specimens as can be rated within the speci?
If you feel that your comments have not received a asym hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.