| ASTM D6943-15 - 1.6.2015 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Significance and Use | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
4.1 Protective coatings are used on metallic and concrete storage and processing vessels, shipping containers, dams and rail cars to protect the substrate from corrosive attack and to protect stored materials (cargo) from contamination. This method provides a means to assess the ability of a protective coating to resist degradation by chemicals and to protect the liquid cargo from contamination by either the substrate or coating, based on visual observations. Other measures of degradation, such as changes in weight or dimensions of the coating material, or chemical changes to the cargo, may be used to assess this protective ability as mutually agreed upon between contracting parties. Simple chemical-resistance evaluations of the lining materials may be performed more conveniently by other pertinent methods as a prescreening test for this procedure in accordance with Test Methods C267 and D471. 4.2 This practice covers three approaches to conducting evaluations of a lining coating material’s fitness for purpose. 4.2.1 Method A—Evaluation of specimens under conditions of constant temperature at atmospheric pressure, (that is, without a thermal gradient). 4.2.2 Method B—Evaluation of specimens under conditions which provide a temperature gradient across the sample. 4.2.3 Method C—Evaluation of specimens under conditions of constant temperature and increased pressure, (that is, without a thermal gradient). | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 1. Scope | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
1.1 This practice establishes procedures for the evaluation of the resistance of industrial protective coatings to immersion in chemicals. 1.2 Linings are a particular type of coating intended for protection of substrates from corrosion as a result of continuous or intermittent fluid immersion. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parenthesis are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 2. Referenced Documents | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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