ASTM D6943 - 10

    Standard Practice for Immersion Testing of Industrial Protective Coatings

    Active Standard ASTM D6943 | Developed by Subcommittee: D01.46

    Book of Standards Volume: 06.02


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    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 AEvaluation of specimens under conditions of constant temperature at atmospheric pressure, (that is, without a thermal gradient).

    Method BEvaluation 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 CEvaluation 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. Scope

    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.

    ASTM Standards

    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 Standard

    TM0174-2002 Laboratory Methods for the Evaluation of Protective Coatings and Lining Materials on Metallic Substrates in Immersion Service


    ICS Code

    ICS Number Code 25.220.99 (Other treatments and coatings)

    UNSPSC Code

    UNSPSC Code 46181533(Protective coats)


    DOI: 10.1520/D6943-10

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