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    ASTM D4671 - 21

    Standard Test Method for Polyurethane Raw Materials: Determination of Unsaturation of Polyols

    Active Standard ASTM D4671 | Developed by Subcommittee: D20.22

    Book of Standards Volume: 08.02


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    Significance and Use

    5.1 This test method is suitable for quality control, as specification tests, and for research.

    5.2 Side reactions that form unsaturated compounds in polypropylene oxides produce small amounts of polymers with only one hydroxyl group per chain. These unsaturated polymers lower functionality and molecular weight, while broadening the overall molecular-weight distribution.

    1. Scope

    1.1 This test method measures unsaturation in polyether polyols. (See Note 1.) It uses 2 mL of ca. 0.05 M mercuric acetate reagent in methanol and about 1 g of sample or less. This test method uses a potentiometric determination of an end point.

    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 Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Caution should be taken when handling mercury and mercury containing products. See the applicable product Safety Data Sheet (SDS) for additional information. Users should be aware that selling mercury and/or mercury containing products into your state or country may be prohibited by law.

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

    Note 1: This standard is equivalent to ISO 17710.

    1.5 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

    D883 Terminology Relating to Plastics

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

    E456 Terminology Relating to Quality and Statistics

    E2935 Practice for Evaluating Equivalence of Two Testing Processes


    ICS Code

    ICS Number Code 83.040.30 (Auxiliary materials and additives for plastics)

    UNSPSC Code

    UNSPSC Code 12352100(Organic derivatives and substituted compounds)


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

    DOI: 10.1520/D4671-21

    Citation Format

    ASTM D4671-21, Standard Test Method for Polyurethane Raw Materials: Determination of Unsaturation of Polyols, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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