ASTM D5894 PDF

ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1.

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ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 1. It does not specify specimen preparation nor evaluation of results.

No other units of measurement are included in this standard. 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.

Referenced Documents 2. Terminology 3. Summary of Practice 4. The fog electrolyte is a relatively dilute solution, with 0. NOTE 1—The irradiance target setpoint of 0. Current edition approved July 1, Published July Originally approved in Last previous edition approved in as D — These factors frequently have a synergistic effect on one another.

This practice is intended to provide a more realistic simulation of the interaction of these factors than is found in traditional tests with continuous exposure to a static set of corrosive conditions. Results obtained from exposures conducted according to this practice can be considered as representative of actual outdoor exposures only when the degree of rank correlation has been established for the speci?

The relative durability of materials in actual outdoor service can be very different in different locations because of differences in UV radiation, time of wetness, temperature, pollutants, and other factors. Therefore, even if results from a speci? Different materials and different formulations of the same material can have signi?

The acceleration factor also varies depending on the variability in rate of degradation in the laboratory test and in actual outdoor exposure. Because of possible variability between the same type of exposure devices, it is not recommended to compare the amount of degradation in materials exposed for the same duration at separate times, or in separate devices running the same test condition.

Apparatus 6. NOTE 2—Committee G03 is developing information to be published in Appendices of G , G , G , and G for guidance on uniformity of conditions in the test chambers and allowed operational? Test Specimens 7. The control specimen should have known durability and be of similar composition to the test specimens. It is preferable to have two control materials: one of higher durability and one of lower durability.

Procedure 8. NOTE 3—It has been found that in certain cases the exposure must start in the? It is thought that the initial UV damage to the coating allows the subsequent salt fog to produce a more realistic corrosion attack on the substrate. Box , Houston, TX NOTE 4—Higher temperatures usually produce faster degradation, but possibly at the expense of realism.

Report Keywords This will help minimize variation in degradation due to variations in conditions within the chamber. Practice D also references a number of other standards that may be used for evaluating the appearance change of the specimens. Duration of Exposure 9. 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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phone , fax , or service astm.

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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D These factors frequently have a synergistic effect on one another. This practice is intended to provide a more realistic simulation of the interaction of these factors than is found in traditional tests with continuous exposure to a static set of corrosive conditions. Results obtained from exposures conducted according to this practice can be considered as representative of actual outdoor exposures only when the degree of rank correlation has been established for the specific materials being tested. The relative durability of materials in actual outdoor service can be very different in different locations because of differences in UV radiation, time of wetness, temperature, pollutants, and other factors.

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