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Determination of Melt Flow Index Abstract: In this lab, the experimental procedure for determining the melt flow index for a material will be explained and exemplified. A material will begin in solid state, be melted, then the flow index will be measured using a scale and an extrusion plastometer. Introduction: The melt flow index of a material is comparable to testing the viscosity of a liquid. At a certain temperature, a material is melted and forced through an extrusion plastometer. The time it takes for a certain amount of a melted material to drain through an orifice is measured by performing the following test. The information obtained in this lab and ones similar to it is important for knowing flow rates in various type of molding, including extrusion dies. The American Society for Testing on Materials (ASTM) covers the requirements for performing this test. This test is the ASTM 1238. Various materials have different standard test conditions. The material being tested in this lab is polypropylene. It has two standards. First, it nee