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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Last previous edition approved in as D — While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing.
Practice G 53 has been replaced by Practice G Maximum thickness is 8 mm 3? A recovery period from 12 to 24 h is generally sufficient. Failure in a condensation satm may be caused by a number of factors including a deficiency in the coating itself, contamination of the substrate, or inadequate surface preparation.
Certain substrates may deform from the heat and moisture. The quality of the water in the pan does not affect the test since the evaporation and condensation process yields distilled water, but the use of tap water can result in the accumulation of residues in the water pan. Condensation is produced by asfm one surface of a coated specimen to a heated, saturated mixture d458 air and water vapor, while the reverse side of the specimen is exposed to the cooling effect of room temperature air.
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory d485 prior to use. Drying periods should be at least 4 h long.
The specimens should be mounted to avoid gaps between specimens that allow heat and moisture to escape.
The resulting heat transfer causes vapor to condense on the test specimens as liquid water saturated with air. Locate the chamber away from air vents and direct drafts. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
Alternative practices for testing water resistance of coatings include Practices DDand D Check the samples periodically to make sure condensation is occurring.
These tests usually result in a pass or fail determination but the degree of failure also may be measured. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. A coating system is considered to asmt if there is no evidence of water-related failure after a specified period of time.
Automatic drying requires the apparatus described in 5. 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 does not specify specimen preparation, specific test conditions, or evaluation of results.
Condensate usually seals cracks or holes smaller than 1 mm 0.
Rate specimens for changes in color, blistering, etc. Individual reprints single or multiple copies of this standard atm be obtained by contacting ASTM at the above address or at phonefaxor service astm. Approved June 1, Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Cleveland Condensing Type Cabinet
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. However, it is possible to test the blister resistance of aastm coatings on wood specimens by mounting the uncoated wood surface facing the inside of the chamber.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The test is therefore useful for evaluating coatings alone or complete coating systems.
D5485 tests usually result in a pass or fail determination but the degree of failure also may be measured. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. 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. Historical Version s – view previous versions satm standard.
Other temperatures may be used provided that the temperature is reported in conformance with Section 8. Various types of tape can be used to seal the gaps that develop when the specimen deforms. It does not specify specimen preparation, speci?
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
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. A superscript epsilon d458 indicates an editorial change since the last revision or reapproval.
Vents, approximately 3 to 5 mm 0. Remove only as many specimens as can be rated within the speci?