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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Combining values from the two systems may result in non-conformance with the standard. Certain substrates may deform from the heat and moisture. Various types of tape can be used to seal the gaps that develop when the specimen deforms.
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
Coated wood specimens may be mounted in the same way. The test is therefore useful for evaluating coatings alone or complete coating systems. 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 awtm is exposed to the cooling effect of room temperature r4585. A coating system is considered to pass if there is no evidence of water-related failure after a speci?
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. Check the samples periodically to make sure condensation is occurring. However, it is possible to test the blister resistance of house coatings on wood specimens by mounting the uncoated wood surface facing the inside of the chamber.
Other temperatures may be used provided that the temperature is reported in conformance with Section 8.
Originally approved in This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. When removing a specimen for inspection, replace it with a blank so that the test conditions are not altered. If the specimens cannot completely?
Vents, approximately 3 to 5 mm 0. 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. These tests usually result in a pass or fail determination but the degree of failure also may be measured. C4585 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.
Cleveland Condensing Type Cabinet
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 post-recovery rating allows evaluation of the permanent effects of the exposure as distinct from the transient effects, and is especially important for evaluation of color and gloss.
NOTE 4—A 3 mm glass plate in place of a sample will satm to monitor whether condensation is occurring.
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. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
ASTM International – Standard References for ASTM D / DM – 18
It does not specify specimen preparation, specific test conditions, or evaluation of results. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Do not leave the specimens in the apparatus at the conclusion of the test as the specimens can remain wet for hours, d4558 even days, when the apparatus is turned off.
Link to Active This link will always route to the current Active version of the standard. Approved June 1, These tests usually result in a pass or fail determination but the degree of failure also may be measured. If you feel that your comments have not received a fair x4585 you should make your views known to the ASTM Committee on Standards, at the address shown below.
While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. Condensate usually seals cracks or holes smaller than 1 mm 0. Evaluate specimens no less than 5 min and d45855 more than 10 min after removal from test, as the effects from water exposure can change within a short time. Drying periods should be at least 4 h long. Alternative practices for testing water resistance of coatings include Practices DDand D