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Full Description

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.

 

Document History

  1. ASTM D1238-23a


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

    • Most Recent
  2. ASTM D1238-23


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

    • Historical Version
  3. ASTM D1238-20


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

    • Historical Version
  4. ASTM D1238-13


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

    • Historical Version
  5. ASTM D1238-10


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

    • Historical Version
  6. ASTM D1238-04c


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

    • Historical Version
  7. ASTM D1238-04b


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

    • Historical Version
  8. ASTM D1238-04a


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

    • Historical Version
  9. ASTM D1238-04


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

    • Historical Version
  10. ASTM D1238-01e1

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

    • Historical Version
  11. ASTM D1238-00


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

    • Historical Version
  12. ASTM D1238-90b


    Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer

    • Historical Version
  13. ASTM D1238-85


    Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastometer

    • Historical Version