ASTM D4584 - 05(2010)

    Standard Test Method for Measuring Apparent pH of Electrocoat Baths

    Active Standard ASTM D4584 | Developed by Subcommittee: D01.21

    Book of Standards Volume: 06.01


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    Significance and Use

    The pH is the measure of the free hydrogen ion concentration of a sample, and it indicates whether an electrocoat bath is acidic, neutral, or basic. Since pH measurements of good precision are made in aqueous solutions, it is suggested that the pH measurements of electrocoat baths are only semi-quantitative, and therefore such measurements should be referred to as apparent pH measurements.

    The pH of electrocoat paints is used for research, production, and quality control or electrocoat bath process control.

    Other related methods for determining the pH of water or aqueous systems are described in Test Methods D1293 and E70.

    1. Scope

    1.1 This test method covers the measurement of the free hydrogen ion concentration of electrocoat baths and their ultrafiltrates.

    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.


    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

    D1193 Specification for Reagent Water

    D1293 Test Methods for pH of Water

    E70 Test Method for pH of Aqueous Solutions With the Glass Electrode

    E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings)

    UNSPSC Code

    UNSPSC Code 73181101(Electro coating services)


    DOI: 10.1520/D4584-05R10

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