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 test is therefore useful for evaluating coatings alone or complete coating systems. The specimens form the roof or walls of the satm chamber so that the back sides of the specimens are exposed to the cooling effects of room temperature air. It does not specify specimen preparation, speci?

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.

Failure in a condensation test may be caused by a number of factors including a de? Maximum thickness is 8 mm 3? This practice is derived from research of the Cleveland Society for Coatings Technology. A number in parentheses indicates the year of last reapproval. 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. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

The values given in parentheses are for information only. 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.

These sstm usually result in a pass or fail determination but the degree of failure also may be measured. 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. Work Item s – proposed revisions of this standard. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

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A superscript epsilon e indicates an editorial change since the last revision or reapproval. 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. Check the samples periodically to make sure condensation is occurring. Various types of tape can be used to seal the gaps that develop when the specimen deforms.

The resulting heat transfer causes vapor to condense on the test specimens as liquid water saturated with d455. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Cleveland Condensing Type Cabinet

When removing a specimen for inspection, replace it with a blank so that the test conditions are not altered.

Remove only as many d44585 as can be rated within the speci? Summary of Practice 3.

A coating system asstm considered to pass if there is no evidence of water-related failure after a speci? Current edition approved June 1, A recovery period from 12 to 24 d4558 is generally sufficient.

Approved June 1, Referenced Documents purchase separately The dd4585 listed below are referenced within the subject standard but are not provided as part of the standard. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Practice G 53 has been replaced by Practice G While corrosion products will drain into the water bath, they are not carried into the vapor that condenses on the test specimens. 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. 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 post-recovery rating allows evaluation of the permanent effects of the exposure as distinct from the transient ashm, and is especially important for evaluation of color and gloss.

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While corrosion products will drain into the water bath, they are not carried into the vapor f4585 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.

Materials thicker than 8 mm 3? Automatic drying requires the apparatus described in 5.

Certain substrates may deform from the heat and moisture. Alternative practices for testing water resistance adtm coatings include Practices DDand D These tests usually result in a pass or fail determination but the degree of failure also may be measured.

Vents, approximately 3 to 5 mm 0. The specimens should be mounted to avoid gaps between specimens that allow heat and moisture to escape.

ASTM International – Standard References for ASTM D / DM – 18

The test is therefore useful for evaluating coatings alone or complete coating systems. Originally approved in If the test panels overshadow the upper shelf, do not put test panels on the upper shelf.

Mount coated metal panels with the coating to be tested facing the inside of the chamber. Rate specimens for changes in color, blistering, etc. Condensate usually seals cracks or holes smaller than 1 mm 0. 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.

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. Drying periods should be at least 4 h long. 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, specific test conditions, or evaluation of results.

Historical Version s – view previous versions of standard.