MFI is the characteristic
mainly responsible for ease of moulding and high
output rates. The higher the MFI, the lower the cylinder
temperature which can be used to obtain adequate mould
filling and acceptable surface finish, and consequently, in
most cases, the higher the output will be. For resins with
a constant MFI, the degree to which an increase in density
leads to higher or lower outputs will depend mainly on the
size of the moulding in relation to the size of the machine.
For adequate melting of the granules, higher density