ASTM D4938 - 89(2013)

    Standard Test Method for Erosion Testing of Antifouling Paints Using High Velocity Water

    Active Standard ASTM D4938 | Developed by Subcommittee: D01.45

    Book of Standards Volume: 06.02


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    ASTM D4938

    Significance and Use

    4.1 This test method is intended to measure the erosion rates of ablative antifouling paint systems exposed to flowing water at velocities designed to subject the paint system to shear stresses experienced in service.

    4.2 Measurement of erosion rates are necessary to help in the assessment of ablative antifouling paint film thicknesses required for fouling control between scheduled drydockings of ships, in the selection of materials, in producing quality assurance, and in understanding the performance mechanism.

    4.3 The test data is intended to serve as a guide for predicting the service life of ablative antifouling paints in order to calculate the necessary paint thickness to fit specified deployment cycles. Erosion rates of antifouling paints in service will vary depending on such factors as: berthing location, geographic area of operation, salinity, pH, and temperature of seawater. It should also be recognized that some areas of the ship are subject to different erosion rates.

    4.4 The degree of correlation between results obtained from this test method and shipboard service has not been determined.

    1. Scope

    1.1 This test method covers the determination of erosion rates for marine antifouling paint systems immersed in flowing natural seawater.

    1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    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. For a specific hazard statement, see Section 7.


    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

    A569/A569M Specification for Steel, Carbon (0.15 Maximum, Percent), Hot-Rolled Sheet and Strip Commercial

    D823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels

    D1889 Test Method for Turbidity of Water

    D2200 Practice for Use of Pictorial Surface Preparation Standards and Guides for Painting Steel Surfaces

    U.S. Military Specifications

    DOD-P-24647 Paint, Antifouling, Ship Hull (Metric)

    DOD-P-24655 Paint, Underwater Hull, Anticorrosion (Metric)

    MIL-P-24441 Paint, Epoxy-Polyamide


    ICS Code

    ICS Number Code 47.020.05 (Materials and components for shipbuilding)

    UNSPSC Code

    UNSPSC Code 31211500(Paints and primers)


    DOI: 10.1520/D4938

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