Fracture Initiation caused by raw material non metallic elements and compounds
Melt flow index (MFI)
Melt Flow Index determines the melt flow rate (MFR) of a material in grams that flows in 10 minutes through an extruder with known dimensions and a pressure with a known load. The extrusion rate of a polymer melt allows comparison between processing temperatures for polymers.
The Melt Flow Index is a measure of the ease of flow of the melt of a thermoplastic polymer. It is defined as the mass of polymer in grams flowing in 10 minutes through a capillary of specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures. The method is given in ASTM D1238.
The melt flow rate is an indirect measure of molecular weight, high melt flow rate corresponding to low molecular weight.
