ASTM D/DM: Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation. Designation: D – 07 Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation1 This standard is issued. ASTM D/DM Standard Practice for Testing Water Resistance of Coatings Using Controlled Condensation. standard by ASTM.
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Practice G 53 has been replaced by Practice G Certain substrates may deform from the heat and moisture. Check the samples periodically to make sure condensation is occurring. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? These tests usually result in a pass or fail determination but the degree of failure also may be measured.
Failure in a condensation test may be caused by a number of factors including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation. Combining values from the two systems may result in non-conformance with the standard. Do not leave the specimens in the apparatus at the conclusion of the test as the specimens can remain wet for hours, or even days, when the apparatus is turned off.
Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Condensation is produced by exposing one surface of a coated specimen to a heated, saturated mixture of air and water vapor, while the reverse side of the specimen is exposed to the cooling effect of room temperature air.
For manual drying of specimens, remove them from the apparatus. A coating system is considered to pass if there is no evidence of water-related failure after a specified period of time. Practices D ashm application techniques for the production of uniform?
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Approved June 1, Various types of tape can be used to seal the gaps that develop when the specimen deforms. This practice is derived from research of the Cleveland Society for Coatings Technology. While corrosion products will drain aetm the water bath, they are not carried into the vapor that condenses on the test specimens.
Work Item s – proposed revisions of this wstm. It does not specify specimen preparation, speci? Current edition approved June 1, Drying periods should be at least 4 h long. Summary of Practice 3.
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
The test is therefore useful for evaluating coatings alone or complete coating systems. Condensate usually seals cracks or holes smaller than 1 f4585 0. Minimum size is mm 3-in. Rate specimens for changes in color, blistering, etc.
The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. The removal of specimens for inspections during operation is permitted.
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. Alternative practices for testing water resistance of coatings include Practices DDand D A superscript epsilon e indicates an editorial change since the last revision or reapproval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Automatic drying requires the apparatus described in 5. When removing a specimen for inspection, replace it with a blank so that the test conditions are not altered.
These tests usually result in a pass or adtm determination but the degree of failure also may be measured. The test specimens are inclined so that condensate runs off the test surface by gravity and is replaced by fresh condensate in a continuous process during the condensate cycle.
Originally approved in 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in r4585 standard.
Materials thicker than 8 mm 3? 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.
The water quality should be agreed upon between the customer and the supplier for running this test.
The resulting heat transfer causes vapor to condense on the test specimens as liquid water saturated with air. 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. The specimens form the roof or walls of the test chamber so that the back sides of the specimens are exposed to the cooling effects of room temperature air.
Other temperatures may be used provided that the temperature is reported in conformance with Section 8. While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens.
Locate the chamber away from air vents and direct drafts.
Cleveland Condensing Type Cabinet
However, it is possible to test the blister resistance of house coatings on wood specimens by mounting the uncoated wood surface facing the inside asmt the chamber. Coated wood specimens may be mounted in the same way. Condensation is produced by exposing one surface of a coated specimen to a heated, saturated mixture of air and water vapor, while the reverse side of the specimen is exposed to the cooling effect of room temperature air.
However, it is possible to test the blister resistance of house paints on wood specimens by mounting the uncoated wood surface facing the inside of the chamber.
It is the responsibility of the user of this standard to establish appropriate safety, health, ast environmental practices and determine the applicability of regulatory limitations prior to use. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of d44585 other.
NOTE 4—A 3 mm glass plate in place of a sample will work to monitor whether condensation is occurring.