The Moldflow second order viscosity model describes the temperature and shear rate dependence of the viscosity using a quadratic formulation.
The viscosity model is given by the following equation:
where:
is the viscosity (Pa s) -
is the shear rate (1/s) -
is the temperature (deg C). - and
to 
are data-fitted coefficients
Note: The second order viscosity model requires temperature values in degrees Celsius, whereas the Cross-WLF viscosity model requires temperature values in Kelvin.