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ASTM D1238

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

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