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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The water quality should be agreed upon between the customer and the supplier for running this test. 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.
ASTM D 控制冷凝法对涂层耐水性试验方法_百度文库
Summary of Practice 3. Various types of tape can be used to seal the gaps that develop when the specimen deforms.
The specimens should be mounted to avoid gaps between specimens that allow heat and moisture to escape. 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.
Minimum size is mm 3-in.
Other temperatures may be used provided that the temperature is reported in conformance with Section 8. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
This practice is derived from research of the Cleveland Society for Coatings Technology. Alternative practices for testing water resistance of coatings include Practices DDand D The test is therefore useful for evaluating coatings alone or complete coating systems.
Remove only as many specimens as can be rated within the speci?
Approved June 1, The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. 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. The resulting heat transfer causes vapor to condense on the test specimens as liquid water saturated with air. Failure in a condensation test may be caused by a number of factors including a de?
Coated wood specimens may be mounted in the same way. 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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? If the specimens cannot completely?
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. A coating system is considered to pass if there is no evidence of water-related failure after a specified period of time.
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 work to monitor whether condensation is occurring.
Materials thicker than 8 mm 3? It does not specify specimen preparation, specific test conditions, or evaluation of results. The values given in parentheses are for information only.
ASTM International – Standard References for ASTM D / DM – 18
Mount coated metal panels d458 the coating to be tested 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. This practice is derived from research of the Cleveland Society for Coatings Technology.
Combining values from the two systems may result in atsm with the standard. Originally approved in Last previous edition approved in as D — Current edition approved June 1, A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Historical Version s – view previous versions of standard. Locate the chamber away from air vents and direct drafts. Link to Active This link will always route to the current Active version of the standard. 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.
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. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone aztm, faxor service astm.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Certain substrates may deform from the heat and moisture.
Cleveland Condensing Type Cabinet
When removing a specimen for inspection, replace it with a blank so that the test conditions are not altered. Practice G 53 has been replaced by Practice G Automatic drying requires the apparatus described in 5. Practices D cover application techniques for the production of uniform? A number in parentheses indicates the year of last reapproval. These tests usually result in a pass or fail determination but the degree of failure also may be measured.
Maximum thickness is 8 mm 3? Rate specimens for changes in color, blistering, etc. 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.