Model Number: SSI 523 MFI
Standard Number: IS: 2530, IS: 10810 (Pt 22), ASTM D 1238
Melt Flow Index (MFI) is a measure of how many grams of a polymer flow through the die in ten minutes. The test is performed at a given temperature depending on the plastic. The force used to push the plastic through the system is supplied by a weight which sits on top of a piston.
The melt flow index test method is useful for quality control tests on polyethylene having low melt viscosity. The method covers the finding of melt flow index of polyethylene insulation and sheath of electric cables by measuring the rate of extension of polyethylene through an orifice of a specific length and diameter, under prescribed conditions of temperature and pressure. Melt flow index is the fluidity of molten polyethylene expressed as the weight in grams extruded in 10 min through a standard jet under a specific pressure and temperature. The MFI is expressed grams unit.
The instrument conforms to ASTM D 1238, IS: 10810 (Pt 22), IS: 2530,
The Instrument consist of the following
One hardened steel cylinder.
Specially designed heaters, for uniform heating throughout the cylinder,
Temperature controlled by PID temperature indicating controller , within an control accuracy of 0.5 oC
Mild steel piston, with head of length of 6.35 ± 0.10mm. A stud is attached to support the load.
The piston is thermally insulated from the load.
Two weights of 2.16g and 5 kg.
Two Hardened steel jet: Jet A: 8.000 ± 0.025 mm and internal diameter of 2.095 ± 0.005 mm
Jet B: Length 8.000 ± 0.025 mm and internal diameter of 1.160 ± 0.005 mm are provided.
Barrel cleaning device
The polymer sample is filled in the per heated barrel and a piston with specified load is applied on the same. As the sample starts to melt it flows through the jet fitted at the bottom of the barrel. The flowing sample is cut every 10 mins and weighed to deter MFI of the polymer.
Note : Weighing machine is not part of this instrument.