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 is a requirement in order for this procedure to work correctly. Historical Version s – view previous versions of standard. Other tests are used to monitor degree of failure as a function of exposure time.

The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. Operate the test continuously with the test chamber closed unless otherwise speci? Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day.

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

As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Last previous edition approved in as D — If any specimen does not have condensation, or the condensation is present on only part of the specimen surface, the area within mm 4 astmm.

It does not specify specimen preparation, or evaluation of results. The level of water in the heating jacket should be approximately 30 cm 12 in. Other tests are used to s2247 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. Four typical designs are shown in Fig. 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. Water permeates the coating at rates that are dependent upon the characteristics of the coating.

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ASTM D在%相对湿度下涂层的耐水性试验_百度文库

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. Specimens must be placed at a level above the water in the heating jacket to insure proper condensation.

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? 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.

Other tests may also asm water droplets on the surface but where the source is not from condensation. The values given in parentheses are for information only. Active view current version of standard Translated Standard: A recovery period from 12 to 24 h is generally sufficient. This practice is therefore useful for evaluating coatings alone or complete coating systems. 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.

This makes this practice suitable for flat panels as well asttm large asgm 3D objects.

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

Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Material used for supports shall be of sufficient stiffness so that they do asfm distort or sag during prolonged use. Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Approved December 1, A coating system is considered to pass if there is no evidence of water-related satm after a period of time.

The minimum distance between adjacent test specimens shall be mm. It is difficult to produce condensation with small chambers because the temperature differential is too slight. 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. Your comments will receive careful consideration at a d22477 of the responsible technical committee, which you may attend.

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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. Current edition approved Dec. Link to Active This link will always route to the current Active f2247 of the standard. This standard has been approved for use by agencies of the U.

A number in parentheses indicates the year of last reapproval. If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area. Three types of apparatus have been found to meet the requirements of this practice. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation.

Report any instances of condensation non-uniformity if they occur during the exposure. Before using the exposure device to this standard for the? 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.

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. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray. The minimum distance between specimens used for chamber veri?

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? 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.