GSO ASTM D1238:2022
Gulf Standard
Current Edition
·
Approved on
12 May 2022
·
Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
GSO ASTM D1238:2022 Files
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GSO ASTM D1238:2022 Scope
1.1 This test method covers the determination of the rate of
extrusion of molten thermoplastic resins using an extrusion
plastometer. After a specified preheating time, resin is extruded
through a die with a specified length and orifice diameter under
prescribed conditions of temperature, load, and piston position
in the barrel. Four procedures are described. Comparable
results have been obtained by these procedures in interlaboratory round-robin measurements of several materials and are
described in Section 15.
1.2 Procedure A is used to determine the melt flow rate
(MFR) of a thermoplastic material. The units of measure are
grams of material/10 minutes (g/10 min). It is based on the
measurement of the mass of material that extrudes from the die
over a given period of time. It is generally used for materials
having melt flow rates that fall between 0.15 and 50 g/10 min
(see Note 1).
1.3 Procedure B is an automatically timed measurement
used to determine the melt flow rate (MFR) as well as the melt
volume rate (MVR) of thermoplastic materials. MFR measurements made with Procedure B are reported in g/10 minutes.
MVR measurements are reported in cubic centimetres/ten
minutes (cm3
/10 min). Procedure B measurements are based
on the determination of the volume of material extruded from
the die over a given period of time. The volume is converted to
a mass measurement by multiplying the result by the melt
density value for the material (see Note 2). Procedure B is
generally used with materials having melt flow rates from 0.50
to 1500 g/10 min.
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