ASTM D2247 PDF

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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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. Approved December 1, Current edition approved Dec. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. 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.

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

Some tests are used for a pass or fail determination at an arbitrary 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 minimum distance between adjacent specimens or between specimens and the walls of the chamber shall wstm at least 30 mm. Link to Active This link will always route to the current Active version of the standard.

Remove only as many specimens as can be rated within the speci? 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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

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This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Before using the exposure device to this standard for the? 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 control 8—Constant level e2247 tank unheated with over?

Historical Version s – view previous versions of standard. Operate the test continuously with the test chamber closed unless otherwise speci? As the warmer saturated air passes the cooler specimens, water is v2247 onto the specimens in the form of condensation.

This practice differs from other methods dd2247 condensation is only formed on the front coating surface, while the back surface is outside the exposure area. Other tests may also deposit water droplets d22247 the surface but where the source is not from condensation for example, water spray.

Users of this practice alone may use the known performance of the controls to set test end points. Reverify the chamber if there are any changes to the setup of the equipment or if any of the components listed in Section 5 are repaired or replaced.

Last previous edition approved in as D — Water permeates the coating at rates that are dependent upon the characteristics of the coating. Referenced Documents purchase separately The documents listed below are referenced within the x2247 standard but are not provided as part of the standard.

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Practices D cover application techniques for the production of uniform? It is difficult to produce condensation with small chambers because the temperature differential is too d247.

It does not specify specimen preparation, or evaluation of results.

Material used for supports shall be of sufficient stiffness so that they do not distort or sag during prolonged use. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.

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Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D Polyvinyl chloride pipe and? A recovery period from 12 to 24 h is generally sufficient.

Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. 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. Your comments are invited either for revision aastm this standard or for additional standards and should be addressed to ASTM International Headquarters.

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. Active view current version of standard. This practice is therefore useful for evaluating asgm alone or complete coating systems.

This makes this practice suitable for flat panels as well as large or 3D objects. Summary of Practice 3.

The minimum distance between specimens used for chamber veri? Position 3-dimensional specimens on a support so that the primary surface is f2247 close to end-use position as possible. 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.

Arrange specimens so that condensate from one specimen cannot drip on other specimens. The minimum distance between adjacent test specimens shall be mm. The values given 2d247 parentheses are for information only. Primary limit control for immersion heater 5 8—Water line 9—Insulation if necessary see X1.

The values given in parentheses are for information only.

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