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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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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. Primary limit control for immersion heater 5 8—Water line 9—Insulation if necessary see X1.

The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. 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. 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?

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

The minimum distance between specimens used for chamber veri? The values given aatm parentheses are for information only. It does not specify specimen preparation, or evaluation of results. Historical Version s – view previous versions of standard.

Individual reprints single or multiple copies of this standard may be obtained r2247 contacting ASTM at the above address or at phonefaxor service astm. Other tests are used to monitor degree of failure as a function of exposure time. 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 Resistance and Humidity (ASTM D 870, ASTM D 2247)

The minimum distance between adjacent test specimens shall be mm. Users of this practice alone may use the known performance of the controls to set test end points. Rate specimens for changes in color, blistering, etc.

Users of this practice alone may use the known performance of the controls to set test end points. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.

Current edition approved Dec. Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance. This makes this practice suitable for flat panels as well as large or d247 objects. Alternative practices for testing the water resistance of coatings include Practices DDand D Your d227 are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

It may be necessary to avoid placing specimens in the lower portion of the aztm as the temperature differentials at the lower levels may be too small to induce condensation. 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. Water permeates the coating at rates that are dependent upon the characteristics of the coating. Short interruptions to inspect or remove specimens are permitted, but such interruptions should occur no more than once each day.

Polyvinyl chloride pipe and? This practice differs e2247 other methods where condensation is only formed on the front coating surface, while the back surface is outside the exposure area. If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area.


Your comments will receive careful consideration e2247 a meeting of the responsible technical committee, which you may attend. 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.

Active view current version of standard. Circulating fans should be used with caution as their use may reduce the temperature differential and limit condensation. Approved December 1, Before using the exposure device to this standard for the?

Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible. Three types of apparatus have been found to meet the requirements of this practice.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard d22477 are not provided as part of the standard. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Link to Active This link will always route to the current Active version of the standard.

Note 1—Alternative practices for testing the water resistance of coatings include Practices DDand D 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.