ASTM D7191 - 10

    Standard Test Method for Determination of Moisture in Plastics by Relative Humidity Sensor

    Active Standard ASTM D7191 | Developed by Subcommittee: D20.70

    Book of Standards Volume: 08.03


    Buy Standard (PDF)
    4 pages
    $37.00
    Buy Standard (Print)
    4 pages
    $37.00
    Buy Standard + Redline (PDF)
    8 pages
    $44.40

    Historical (view previous versions of standard)

    Translated Standard: Russian
    more info


    ASTM D7191

    Significance and Use

    This test method is intended for use as a control, acceptance, and assessment test.

    Moisture can seriously affect the processability of plastics. It is possible that high moisture content will cause surface imperfections (that is, splay or bubbling) or degradation by hydrolysis. Low moisture (with high temperature) has been known to cause solid phase polymerization.

    The physical properties of some plastics are greatly affected by the moisture content.

    1. Scope

    1.1 This test method covers the quantitative determination of water down to 20 ppm in plastics using a relative humidity sensor.

    1.2 Values stated in SI units are to be regarded as standard.

    1.3 Specimens tested in this test method can reach or exceed 250°C, use caution when handling them after testing has completed.

    1.4 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.

    Note 1—There is no known ISO equivalent to this standard.


    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

    D883 Terminology Relating to Plastics

    D1193 Specification for Reagent Water

    D1600 Terminology for Abbreviated Terms Relating to Plastics

    D6869 Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the Reaction of Iodine with Water)

    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 83.080.01 (Plastics in general)

    UNSPSC Code

    UNSPSC Code 13100000(Rubber and elastomers)


    DOI: 10.1520/D7191-10

    ASTM International is a member of CrossRef.

    ASTM D7191

    Citing ASTM Standards
    Back to Top