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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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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.
This practice is derived from research of the Cleveland Society for Coatings Technology. It does not specify specimen preparation, speci? The values given in astk 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.
Current edition approved June 1, Originally approved in Last previous edition approved in sstm D — Summary of Practice 3. 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.
The resulting heat transfer causes vapor to condense on the test specimens as liquid water saturated with air. 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. Failure in a condensation test 4d585 be caused by a number of factors including a de? The test is therefore useful for evaluating coatings alone or complete coating systems. These tests usually result in a pass or fail determination but the degree of failure also may be measured.
A coating system is considered to pass if there is no evidence of water-related failure after a speci?
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. While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. Vents, approximately 3 to 5 mm 0. Locate the chamber away from air vents and direct drafts.
Certain substrates may deform from the heat and moisture. The specimens should be mounted to avoid gaps between specimens that allow heat and moisture to escape.
Various types of tape can be used to seal the gaps that develop when the specimen deforms. The water quality should be agreed upon between the customer and the supplier for running this test.
The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. Practices D cover application techniques for the production of uniform?
Cleveland Condensing Type Cabinet
If the specimens cannot completely? 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.
Minimum size is mm 3-in. Maximum thickness is 8 mm 3? Materials thicker than 8 aastm 3? If the test panels overshadow the upper shelf, do not put test panels on the upper shelf.
Check the samples periodically to make sure condensation is occurring. NOTE 4—A 3 mm glass plate in place of a sample will work to monitor whether condensation is occurring. The quality of the water in the pan does not affect the d4558 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.
Mount coated metal panels with the coating to be tested facing the inside of the chamber. Coated wood specimens may be mounted in the asm way.
qstm Condensate usually seals cracks or holes smaller than 1 mm 0. Other temperatures may be used provided that the temperature is reported in conformance with Section 8.
The removal of specimens for inspections during operation is permitted. When removing a specimen for inspection, replace it with a blank so that the test conditions are not altered.
Automatic drying requires the apparatus described in 5. For manual drying of specimens, remove them from the apparatus. Drying periods should be at least 4 h long.
ASTM International – Standard References for ASTM D / DM – 18
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.
Rate specimens for changes in e4585, blistering, etc. 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. Remove only as many specimens as can be rated within the speci? A recovery period from 12 to 24 h is generally d585.
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. Approved June 1, Practice G 53 has been replaced by Practice G ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
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