Active Standard ASTM D6943 | Developed by Subcommittee: D01.46
Book of Standards Volume: 06.02
Historical (view previous versions of standard)
Significance and Use
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.
This standard practice covers three approaches to conducting evaluations of a lining coating materials fitness for purpose.
Method A—Evaluation of specimens under conditions of constant temperature at atmospheric pressure, (that is, without a thermal gradient).
Method B—Evaluation of specimens under conditions which provides a temperature gradient across the sample: The temperature may increase from coated side to uncoated side (Method B1) or decrease from coated side to uncoated side (Method B2).
Method C—Evaluation of specimens under conditions of constant temperature and increased pressure, (that is, without a thermal gradient).
Exposure of materials of known performance (a control) at the same time as the test material is recommended.
1.1 This practice establishes procedures for the evaluation of the resistance of industrial protective coatings to immersion in chemicals.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parenthesis are for information only.
1.3 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C868 Test Method for Chemical Resistance of Protective Linings
D16 Terminology for Paint, Related Coatings, Materials, and Applications
D610 Practice for Evaluating Degree of Rusting on Painted Steel Surfaces
D714 Test Method for Evaluating Degree of Blistering of Paints
D2200 Practice for Use of Pictorial Surface Preparation Standards and Guides for Painting Steel Surfaces
D3359 Test Methods for Measuring Adhesion by Tape Test
D3363 Test Method for Film Hardness by Pencil Test
D4138 Practices for Measurement of Dry Film Thickness of Protective Coating Systems by Destructive, Cross-Sectioning Means
D4417 Test Methods for Field Measurement of Surface Profile of Blast Cleaned Steel
D4538 Terminology Relating to Protective Coating and Lining Work for Power Generation Facilities
D4541 Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
D5139 Specification for Sample Preparation for Qualification Testing of Coatings to be Used in Nuclear Power Plants
D5162 Practice for Discontinuity (Holiday) Testing of Nonconductive Protective Coating on Metallic Substrates
D6132 Test Method for Nondestructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage
D6577 Guide for Testing Industrial Protective Coatings
D6677 Test Method for Evaluating Adhesion by Knife
D7055 Practice for Preparation (by Abrasive Blast Cleaning) of Hot-Rolled Carbon Steel Panels for Testing of Coatings
D7091 Practice for Nondestructive Measurement of Dry Film Thickness of Nonmagnetic Coatings Applied to Ferrous Metals and Nonmagnetic, Nonconductive Coatings Applied to Non-Ferrous Metals
D7234 Test Method for Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers
G113 Terminology Relating to Natural and Artificial Weathering Tests of Nonmetallic Materials
NACE StandardTM0174-2002 Laboratory Methods for the Evaluation of Protective Coatings and Lining Materials on Metallic Substrates in Immersion Service
ICS Number Code 25.220.99 (Other treatments and coatings)