ASTM D870 PDF
Find the most up-to-date version of ASTM D at Engineering Dpdf – Download as PDF File .pdf), Text File .txt) or read online. ASTM Standards: the coating and upon the temperature of the water. Any effects. failure in hours shall be recorded. ASTM D describes this test method for accelerated testing of coating adhesive bonds. Interior Adhesion. A 6″ conduit test.
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate.
In all cases only the current version of the standard as published by ASTM is to be considered the official document. A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Although the apparatus and procedure could be employed in immersion tests using solutions of various materials in water, this practice is limited to tests in water alone. It does not specify specimen preparation, speci? The values given in parentheses 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 Dec. Originally published as D — 46 T. Last previous edition D — Summary of Practice 3. The exposure conditions are varied by selecting: Water permeates the coating at rates that are dependent upon the characteristics of the coating and upon the temperature of the water.
Any effects such as color change, blistering, loss of adhesion, softening, or embrittlement are observed and reported. Knowledge on how a coating resists water immersion is helpful in predicting its service life. Failure in a water immersion test may 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 typically result in a pass or fail determination, but the degree of failure may also be measured.
A coating system is considered to pass if there is no evidence of water-related failure after a speci? It is also possible to use very large tanks for testing coated pipe or s870 large coated products. The cover is not to touch the test specimens. The reason for the cover is to help maintain water temperature and water level. The cover should not touch any of the dd870 specimens nor interfere with the air circulation around the specimens.
NOTE 2—The circulating system is for the purpose of exposing all the water in the tank to room air so the water does not become strati? The substrate composition and surface preparation, specimen preparation, and the number of specimens should be agreed upon prior to testing. Practices D covers application techniques for the production of uniform? 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.
ASTM D870 – 15
Reagent water conforming to Type IV of Speci? If no temperature is speci? Maintain the temperature throughout the test. Protect the edges and backs of the specimens from corrosion if these surfaces are not to be tested.
Continuous replacement of the water is permitted.
If neededadd water to maintain original water level. Rate specimens for changes in color, blistering, etc.
ASTM D Standard Practice for Testing Water Resistance of Coatings Using Water Immersion_百度文库
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 s870 short time. Remove only as many specimens as can be rated asgm the speci? A recovery period from 12 to 24 h is generally sufficient. The post-recovery rating allows evaluation of the permanent effects of the exposure asm distinct from the d780 effects, and is especially important for evaluation of color and gloss. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
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