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 awtm is only formed on the front coating surface, but the back surface is outside the exposure area. Other tests may also deposit water droplets on the surface but where d224 source is not from condensation for example, water spray.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Summary of Practice 3. Practices D cover application techniques for the production of uniform? Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D After the specimens have been in an unopened chamber for at least 12 h, open the aastm and check for the presence of uniform condensation on each specimen.

Slotted nonmetallic supports are suitable for?

It is difficult d247 produce condensation with small chambers because the temperature differential is too slight. Report any instances of condensation non-uniformity if they occur during the exposure. This makes this practice suitable for flat panels as well as large or 3D objects. This practice differs from other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area.

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The minimum distance between adjacent specimens or between specimens and satm walls of the chamber shall be at least 30 mm. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Sstm on Standards, at the address shown below. Specimens must be placed at a level above the water in the heating jacket to insure proper condensation. Material used for supports shall be of sufficient stiffness so that they do not distort or sag during asstm use.

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.

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 for example, water spray.

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

Other tests may also deposit water droplets on the surface but where the source is not from condensation. A number in parentheses indicates the year of last reapproval. The values given in parentheses are for information only.

A recovery period from 12 to 24 h is generally sufficient. A 2d247 system is d227 to pass if there e2247 no evidence of water-related failure after a period of time. Water permeates the coating at rates that are dependent upon the characteristics of the coating.

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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Some tests are used for a pass or fail determination at an arbitrary time. Operate the test continuously with the test chamber closed unless otherwise speci? Remove only as many specimens as can be rated within the speci? Historical Version s – view previous versions of standard.

The post-recovery rating allows evaluation of the permanent effects of the exposure as d22247 from the transient effects, and is especially important for evaluation of color and gloss. 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.

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

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

The level of water in the d2247 jacket should be approximately 30 cm 12 in.

This practice differs from other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area. The values given in parentheses are for information only.