SRPS G.S2.521:2011

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

Scope

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 and load. Four procedures are described. Comparable results have been obtained by these procedures in interlaboratory round-robin measurements of several materials. Procedure A is used to determine the melt flow rate (MFR) of a thermoplastic material. 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. Procedure C is an automatically timed measurement used to determine the melt flow rate (MFR) of polyolefin materials. Procedure D is a multi-weight test commonly referred to as a “Flow Rate Ratio” (FRR) test. This standard does not purport to address the safety concerns, if any, associated with its use

National regulations and standards