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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Such control specimens can provide warning of changes in test severity in aetm given apparatus, and can indicate variations in test severity between different apparatuses.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Certain substrates may deform from the heat and moisture.
Alternative practices for testing water resistance of coatings include Practices DDand D 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. Approved June 1, Practices D cover application techniques for the production of uniform?
If atm specimens cannot completely? The specimens should be mounted to avoid gaps between specimens that allow heat and moisture to escape. Mount coated metal panels with the coating to be tested facing the inside of the chamber. Link to Active This link will always route to the current Active version of 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. A coating system is considered to pass if there is no evidence of water-related failure after a specified period of time. It does not specify specimen preparation, speci? While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. The test is therefore useful for evaluating coatings alone or complete coating systems.
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.
A recovery period from 12 to 24 h is generally sufficient.
A number in parentheses indicates the year of last reapproval. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this astj. Condensate usually seals cracks or holes smaller than 1 mm 0. These tests usually result in a pass or fail determination but the degree of failure also may atsm measured.
Remove only as many specimens as can be rated within the speci? Various types of tape can be used to seal the gaps that develop when the specimen deforms.
Practice G 53 has been replaced by Practice G 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 aatm short time.
However, it is possible to wstm the blister resistance of house paints on wood specimens by mounting the uncoated wood surface facing the inside of the chamber. This practice is derived from research ashm the Cleveland Society for Coatings Technology. Failure in a condensation test may be caused by a number of factors including a de? Automatic drying requires the apparatus described in 5. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM International – Standard References for ASTM D / DM – 18
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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
NOTE 4—A 3 mm glass plate in place of a sample will work to monitor whether condensation asym occurring.
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. The removal of specimens for inspections during operation is permitted.
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
For manual drying of specimens, remove them from the apparatus. The test is therefore useful for evaluating coatings alone or complete coating systems. Last previous edition approved in as D — These tests usually result in a pass or fail determination but the degree of failure also may be measured. Combining values from the two systems may result in non-conformance with the standard. While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens.
The test specimens are d455 so that condensate runs off the test surface by gravity and is replaced by fresh condensate in a continuous process during the condensate cycle.
Cleveland Condensing Type Cabinet
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. 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.
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.