ASTM D2247 PDF

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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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Other tests are used to monitor degree of failure as a function of exposure time.

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 level of water in the heating jacket should be approximately 30 cm 12 in. Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing.

Specimens must be placed at a level above the water in the heating jacket to insure proper condensation. Arrange specimens so that condensate from one specimen cannot drip on other specimens. One asfm 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.

The use of a large heated water tank would tend to make the temperature within the chamber uniform, and thus inhibit or prevent the wstm of condensate on the specimens.

Approved December 1, Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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

This makes this practice suitable for flat panels as well as large or 3D objects. Other tests are used to monitor degree of failure as a function of exposure aetm.

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Your e2247 will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Link to Active This link will always route to the current Active version of the standard. Active view current version of standard. Remove only as many specimens as can be rated within the speci? 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.

As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

Rate specimens for changes in color, blistering, etc. Last previous edition approved in as D — Water permeates the coating at rates that are dependent upon the characteristics of the coating.

Such control specimens can provide warning of changes in test severity in a given apparatus, and can indicate variations in test severity between different apparatuses. 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. This practice differs from other aatm where condensation is only formed on the front coating surface, while the back surface is outside the exposure area.

The saturated mixture of water vapor and air temperature rises and then cools below the dew point, causing condensation on the specimens. Operate the test continuously with the test chamber closed unless otherwise speci?

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

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. If condensation is not observed on any specimen immediately after the chamber is opened, discontinue the test and determine the cause of the lack of condensation before continuing. This standard has been approved for use by agencies of the U. 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.

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The values given in parentheses are for information only. 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?

Report any instances of condensation non-uniformity if they occur during the exposure. Circulating fans should be used with caution as their use may reduce the temperature differential and limit condensation.

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. Users of this practice alone may use the known performance of the controls to set test end points.

It is the responsibility of the user of this standard to d2247 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 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.

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. Originally approved in Polyvinyl chloride pipe and? The values given in parentheses are d22247 information only. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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. Slotted nonmetallic supports are suitable for?

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