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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This practice is therefore useful for evaluating coatings alone or complete coating systems. The minimum distance between adjacent specimens or between specimens and the walls of the chamber shall e2247 at least 30 mm. Position 3-dimensional specimens on a support so that the primary surface is as close to end-use position as possible.

Some tests are used for a pass or fail determination at an arbitrary s2247. Some tests are used for a pass or fail determination at an arbitrary time. Slotted nonmetallic supports are suitable for? A coating system is considered to pass if there is no evidence of water-related failure after a period of time. This makes this practice suitable for?

Summary of Practice 3. Other tests may also deposit water droplets on the surface but where the source is not from condensation.

Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Air pressure to the humidifying tower should be approximately 7 to 14 2d247 1 to 2 psi. Report any instances of condensation non-uniformity if they occur during the exposure.

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

The use of a large heated water tank would tend to make the temperature within the chamber uniform, asgm thus inhibit or prevent the formation of condensate on the specimens. The minimum distance between specimens used for chamber veri? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Best practice is to use two different control specimens, one with known relatively poor performance, and one with known relatively good performance.

The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. If more than one replicate specimen is exposed, place the replicates in different locations in the exposure area.

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.

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. 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.

Four typical designs are shown in Fig. This makes this practice suitable for flat panels as well as large or 3D objects. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The values given in parentheses are for information only. 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.

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Before using the exposure device to this standard for asym Link to Active This link will always route to the current Active version of the standard. Other tests may also deposit water droplets on the surface but where the source is not from condensation for example, water spray.

ASTM D在%相对湿度下涂层的耐水性试验_百度文库

As the warmer saturated e2247 passes the cooler specimens, water is deposited onto the specimens in the form of condensation. Operate the test continuously with the test chamber closed unless otherwise speci?

Ast tests are used to monitor degree of failure as a function of exposure time. The saturated mixture of water vapor and air temperature rises and then cools below the dew point, causing condensation on the specimens. Users of this practice alone may use the known performance of the controls to set test end points.

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

This standard has been approved for use by agencies of the U. Material used for asrm shall be of sufficient stiffness so that they do not distort or sag during prolonged use. It may be necessary to avoid placing specimens in the lower portion of the chamber as the temperature differentials at the lower levels may be too small to induce condensation.