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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Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible. Link to Active This link will always route to the current Active version of the standard.
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 specimens or between specimens and the walls of the chamber shall be at least 30 mm. If condensation is not asstm on any specimen immediately after the chamber is opened, discontinue the test and determine the cause of the lack of condensation before continuing.
Any effects such x2247 color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Ast, D cover application techniques for the production of uniform? Slotted nonmetallic supports are suitable for? The level of water in the heating jacket should be approximately 30 cm 12 in. Polyvinyl chloride pipe and?
Operate the test continuously with the test chamber closed unless otherwise speci? Specimens must be placed at a level above the water in the heating jacket to insure proper condensation. The values given in parentheses are for information only.
As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. This makes this practice suitable for? Your comments are invited either r2247 revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Primary limit control for immersion heater 5 8—Water line 9—Insulation if necessary see X1. A recovery period from 12 to 24 h is generally sufficient.
Specimens used for chamber veri?
Water Resistance and Humidity (ASTM D 870, ASTM D 2247)
Active view current version of standard. 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.
Users of this practice alone may use the known performance of the controls to set test end points. It is difficult to produce condensation with small chambers because the temperature differential is too slight. 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. 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.
Arrange specimens so that condensate from one specimen cannot drip on other specimens. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Three types of apparatus have been found to meet the requirements of this practice. This saturates the air in the lower portion of the test chamber with water vapor.
Four typical designs are shown in Fig. 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.
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. Users of this standard are expressly advised that determination of sstm validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
A coating system is considered to pass if there is no evidence of water-related failure after a period of time. This standard has been approved for use by agencies of the U.
The substrate wstm and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. This is a requirement in order for this procedure to work correctly. Air pressure to the humidifying tower should be approximately 7 to 14 kPa 1 to 2 psi. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Material used for supports shall be of sufficient stiffness xstm that they do not distort or sag during prolonged use. This makes this practice suitable for flat panels as well as large or 3D objects.
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. 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.
Corrosion tests d247 be conducted, as the condensate dripping off the test articles in not recirculated. The minimum distance between adjacent test specimens shall be mm.
Link to Active This link will always route to the current Active version of the standard. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.