ASTM D2247 PDF

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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Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. It does not specify specimen preparation, or evaluation of results. 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. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray.

Link to Active This link will always route to the current Active version of the standard. The minimum distance between adjacent test specimens shall be mm.

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

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but 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. After the specimens have been in an unopened chamber for at least 12 h, open the chamber and check for the presence of uniform condensation on each specimen. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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. Report any instances of condensation non-uniformity if they occur during the exposure.

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Last previous edition approved in as D — Historical Version s – view previous versions of standard. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It is difficult to produce condensation with small chambers because the temperature differential is too slight. 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? Other tests may also deposit water droplets on the surface but where the source is not from condensation. The minimum distance between specimens used for chamber veri? Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance. 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.

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. Specimens used for chamber veri? A number in parentheses indicates the year of last reapproval. As the warmer saturated air passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Before using the exposure device to this standard for the? 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.

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

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ASTM D在%相对湿度下涂层的耐水性试验_百度文库

Current edition approved Dec. If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area. Asstm view current version of standard. Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible. Primary limit control for immersion heater 6 5—Heated water tank for supplying heat and humidity to room 6—Immersion qstm 7—Water temperature limit control 8—Constant level water tank unheated with over?

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. This standard has been approved for use by agencies of the U. A coating system is considered to pass if there is no evidence of water-related failure after a period of time.

Summary of Practice 3. Primary limit control for immersion heater 5 8—Water line 9—Insulation if necessary see X1.

Slotted nonmetallic supports are suitable for?

This d2274 is subject to revision at any time by the responsible technical committee and must be reviewed every? A recovery period from 12 to 24 h is generally sufficient.

Corrosion tests can be conducted, as the condensate dripping off the test articles in not recirculated. Active view current version of standard Translated Standard: This saturates the air in the lower portion of d2247 test chamber with water vapor.