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    ASTM D6657 - 16(2021)

    Standard Test Method for pH of Wet Blue and Wet White

    Active Standard ASTM D6657 | Developed by Subcommittee: D31.02

    Book of Standards Volume: 15.04


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    Significance and Use

    4.1 This test method is designed to measure the pH of a distilled-water extract of Wet Blue and Wet White. This is considered to be a measure of the acidity or alkalinity of the Wet Blue or Wet White. Excessive acidity or alkalinity may have a deleterious effect on the aging characteristics of Wet Blue and Wet White and the leather made from it.

    4.2 This test method is suitable for development, control, and service evaluation of wet blue.

    1. Scope

    1.1 This test method covers the determination of the pH of all types of Wet Blue and Wet White.

    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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    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

    D6659 Practice for Sampling and Preparation of Wet Blue and Wet White for Physical and Chemical Tests

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 59.140.10 (Processes and auxiliary materials)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D6657-16R21

    Citation Format

    ASTM D6657-16(2021), Standard Test Method for pH of Wet Blue and Wet White, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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