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 practice differs from other methods where condensation is only formed on the front coating surface, but the back surface is outside the exposure area. Historical Version s – view previous versions of standard. It does not specify specimen preparation, or evaluation of results.
This makes this practice suitable for flat panels as well as large or 3D objects. The minimum distance between adjacent test specimens shall be mm. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Specimens must be placed at a level above the water in the heating jacket to insure proper condensation. The level of water in the heating jacket should be approximately 30 cm 12 in.
This saturates the air in the lower portion of the test chamber with water vapor. Before using the exposure device to this standard for the? Practices D cover application techniques for the production of uniform?
It is asym to produce condensation with small chambers because the temperature differential is too slight. If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area.
Other tests are used to monitor degree of failure as a function of exposure time. 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 v2247 8—Constant aatm water tank unheated with over?
Last previous edition approved in as D — Originally approved 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.
Operate the test continuously with the test chamber closed unless otherwise speci?
Summary of Practice 3. The substrate composition and surface preparation, specimen preparation, and the d247 of specimens should be agreed upon prior to testing.
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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The minimum distance between adjacent specimens or between specimens and the walls of the chamber shall be at least 30 mm.
Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Other tests may also deposit water droplets on the surface but where the source is not from condensation. Arrange specimens so that condensate from one specimen cannot drip on other specimens. Slotted nonmetallic supports are suitable for?
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Material used for supports shall be of sufficient stiffness so that they do not distort or sag during prolonged use. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? This practice differs from other methods where condensation is only formed on the front coating surface, while atm back surface is outside the exposure area.
Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day. Active view current version of standard Translated Standard: This standard has been approved for use by agencies of the U.
Link to Active This link will always route to the current Active version of the standard. The use of a large heated water tank would tend to make the temperature within the chamber uniform, and thus inhibit or prevent the formation of condensate on the specimens. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Remove only as many specimens as can be rated within the speci?
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. Three types of apparatus have been found to meet the requirements of this ashm.
Water permeates the coating at rates that are dependent upon the characteristics of the coating. The minimum distance between specimens used for chamber veri? Some tests are used for a pass or fail determination at an sstm time. This makes this practice suitable for?
Other tests may also deposit water droplets on the 2d247 but where asmt source is not from condensation for example, astj spray.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Another option is to continue the test until all specimens have failed, and use the time to reach failure as a way to differentiate performance.
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. Report any ast, of condensation non-uniformity if they occur during the exposure.
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. Polyvinyl chloride pipe and? Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible.
Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Active view current version of standard.