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 .
|Published (Last):||16 October 2005|
|PDF File Size:||16.38 Mb|
|ePub File Size:||12.59 Mb|
|Price:||Free* [*Free Regsitration Required]|
A coating system is considered to pass if there is no evidence of water-related failure after a period of time. Some tests are used for a pass or fail determination at an arbitrary time. Remove only as many specimens as can be rated within the speci?
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, but the back surface is outside the exposure area.
Slotted nonmetallic supports are suitable for? The level of water in the heating jacket should be approximately 30 cm 12 in. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.
Report any instances axtm condensation non-uniformity if they occur during the exposure. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. Water permeates the coating at rates that zstm dependent upon the characteristics of the coating.
The post-recovery rating d224 evaluation of the permanent effects of the exposure as distinct from the transient effects, and is especially important for evaluation of color and gloss. It may be necessary to avoid placing specimens asmt the lower portion of the chamber as the temperature differentials at the lower levels may be too small to induce condensation.
Arrange specimens so that condensate from one specimen cannot drip on other specimens. 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.
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Primary limit control for immersion qstm 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? Link to Active This link will f2247 route to the current Active version of the standard.
Other tests are used to monitor degree of failure as a function of exposure time. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.
The minimum distance between adjacent test specimens shall be mm. Primary limit control for immersion heater 5 8—Water line 9—Insulation if astmm see X1.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Note d227 practices for testing the water resistance of coatings include Practices DDand D Specimens used for chamber veri? This is a requirement in order for this procedure to work correctly.
Rate specimens for changes in color, blistering, etc. Other tests may also deposit water droplets on the surface but where the source is not from condensation.
Users of this practice alone may use the known performance of the controls to set test end points. It does not specify specimen preparation, or evaluation of results. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
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.
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.
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. Specimens must be placed at a level above the water d247 the heating jacket to insure proper condensation. Asrm view current version of standard Translated Standard: