ASTM D1238-01e1

    Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer


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    1. Scope

    1.1 This test method covers measurement of the rate of extrusion of molten resins through a die of a specified length and diameter under prescribed conditions of temperature, load, and piston position in the barrel as the timed measurement is being made.

    1.2 Procedure A is a manual cutoff operation based on time used for materials having flow rates that fall generally between 0.15 and 50 g/10 min. Procedure B is an automatically timed flow rate measurement used for materials having flows from 0.50 to 900 g/10 min. By both procedures, the piston travel is generally the same during the timed measurement; the piston foot is about 46 and 20.6 mm above the die. Comparable flow rates have been obtained by these procedures in interlaboratory round-robin measurements of several materials described in 12.1. Provision is made for calculation of melt volume-flow rate as well as melt mass-flow rate.

    Note 1—Round-robin testing indicates this test method may be suitable at flow rates up to 1500 g/10 min if the timing clock resolves the elapsed time to the nearest 0.01 s.

    Note 2—This test method and ISO 1133-1991 are technically equivalent.

    1.3 This standard does not purport to address 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. Specific precautionary statements are given in Note 10, Note 26, and Note 29.


    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

    D618 Practice for Conditioning Plastics for Testing

    D883 Terminology Relating to Plastics

    D3364 Test Method for Flow Rates for Poly(Vinyl Chloride) with Molecular Structural Implications

    D4000 Classification System for Specifying Plastic Materials

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

    ANSI Standard

    B46.1 on Surface Texture Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

    ISO Standard

    ISO 1133 Determination of the Melt-Mass Flow Rate (MFR) and the Melt Volume-Flow Rate (MVR) of Thermoplastics


    ICS Code

    ICS Number Code 83.080.20 (Thermoplastic materials)

    UNSPSC Code

    UNSPSC Code 13102000(Thermoplastic plastics)


    Referencing This Standard
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    DOI: 10.1520/D1238-01E01

    Citation Format

    ASTM D1238-01e1, Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer, ASTM International, West Conshohocken, PA, 2001, www.astm.org

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