The melt flow of a thermoplastic material as determined under Condition E of ASTM D 1238. Condition C or high load melt index produces a higher melt flow for a given material as a result of the greater force applied to the sample during the test.
Term that defines the melt flow rate of a polyethylene resin. An extrusion weight of 2160 grams at 310°F (190°C) is used.
The number of grams, of a thermoplastic resin which can be forced through a 0.0825 inch orifice when subjected to 2160 grams force in 10 minutes at 190°C.
The weight in grams of a thermoplastic material that can be forced through a standard orifice within a specified period of time.
Melt Strength Minimum Specifications Modified Resins
The melt flow rate of a polyethylene plastic when measured at Condition B (at 190°C and 2,160 grams force load) of ASTM D 1238, "Standard Test Method for Flow Rates of Thermoplastics by Extrusion Plastomer." Melt index also gives a general indication of fusion compatibility of different polyethylene piping system materials.
A measure of flow at low shear strain rates, where a capillary tube is used to extrude molten feedstock under a dead load. The melt index depends on the capillary tube diameter and applied load, but is always reported as the grams of feedstock collected from the tube in ten minutes.
The amount, in grams, of a thermoplastic resin which can be forced through an 0.0825 “ orifice when subjected to 2160 gms force in 10 minutes at 190ºC.
