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Apparatus 2. The test cabinet shall consist of a chamber which will provide support for the specimens and include the necessary means for control of temperature and relative h umidity.

Suitable apparatus that may be used to obtain these conditions is described in the Annexes. Test Specimens 3. Preparation of Test Specimens 4. Position of Specimens During Test 5.

Current edition accepted Sept. Originally Issued issued Replaces D - 66 T. Part They then shall be reexamined. The test surface shall be examined for failures specifically agreed upon by the purchaser and the seller. Conditions in the Humidity Chamber 6. These interruptions shall be held to a minimum. Period of Test 9. Examination of Specime. During the progress o the test, examination for deterioration of the test specimen shall be made immediately. At the conclusion of the test, when physical ratings or ratings for degree of recovery of the test.

Precision The diverse methods of rating for failure of the specimens, and their different values, preclude making a statement of precision. This may be accomplished by the introduction of moisture at a temperature above the.

A cabinet constructed to require additional heated humid air to. Cabinets of the construction described in Section A2 will produce the required conditions. It is difficult to produce the desired saturated air conditions within small cabinets, and those of less than 20 ft' 0.

The water temperature shall be no less than 8. A water temperature limit control is required. The thermostatic controller for the chamber temperature is the primary limit control for the immersion heater.

Excessive insulation can minimize the heat and moisture vapor input sufficiently to prevent adequate moisture accumulation within the chamber so that condensation will not occur.

In smaller chambers it may be necessary to water-cool the cover to depress the humid air temperature below the dew point. The location and type of fan is discretionary; however, the air movement should be no more than two air changes per hour.

The preferred method is by the use of an insulated water tank heated by an. Walk-in chambers, as shown in Fig. A2, are not usually constructed with a sloping ceiling due to their size and location. By continuing to use our site, you accept our use of cookies. Close Privacy Overview This website uses cookies to improve your experience while you navigate through the website.

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Scope 1. C Standard Specification for Metal Lath. Other tests may also deposit water droplets on the surface but where the source is not from condensation. Note 1—Alternative practices for testing the water resistance of coatings include Practices D , D , and D It does not specify specimen preparation, or evaluation of results. 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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