Melt flow index of thermoplastic materials defined as the rate of flow in grams per ten minutes of extruder of molten resins from a cylindrical cavity inside a heated metallic tube Harrell conditions of a specified length and diameter under prescribed conditions of temperature, Load, and piston position. The test will be conducted as per ASTM D 1238 and ISO 1133 and the procedure lay out by the customers. It is a measure of the ease of flow of the melt of a thermoplastic polymer.