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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A coating system is considered to pass if there is no evidence of water-related failure after a period of time. It is the responsibility of awtm user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to atm. 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.

The values given in parentheses are for information only. Historical Version s – view previous versions of standard. Three types of apparatus have been found to meet the requirements of this practice.

Water Resistance and Humidity (ASTM D 870, ASTM D 2247)

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. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. 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?

Alternative practices for testing the water resistance of coatings include Practices DDand D This is a requirement in order for this procedure to work correctly. Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated.

This practice is therefore useful for evaluating coatings alone or complete coating systems. Users of this practice alone may use the known performance of the controls to set test end points. Four typical designs are shown in Fig. Summary of Practice 3. Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. 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.

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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

This saturates the air in the lower portion of the test chamber with water vapor. Polyvinyl chloride pipe and?

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.

Before using the exposure device to this standard for the? The values given in parentheses are for information only. 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. Some tests are used for a pass or fail determination at an arbitrary time.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.

It is difficult to produce condensation with small chambers because the temperature differential is too slight. Some tests are used for a pass or fail determination at an arbitrary time.

The level of water in the heating jacket should be approximately 30 cm 12 in. The minimum distance between adjacent test specimens shall be mm. Remove only as many specimens as can be rated within the speci?

Active view current version of standard Translated Standard: Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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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 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.

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. It does not specify specimen preparation, or evaluation of results. This practice differs from other methods where condensation is d22247 formed on the front coating surface, while the back surface is outside the exposure area.

Current edition approved Dec. A number in parentheses indicates the year of last reapproval. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Rate specimens for changes in color, blistering, etc. The saturated mixture of sstm vapor and air temperature rises and then cools below the dew point, causing condensation on the specimens.

Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible. Arrange specimens so that condensate from one specimen cannot drip on other specimens.

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

Report any instances of condensation non-uniformity if they occur during the asstm. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. 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.

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.