The market for polymeric microsystems or microcomponents is getting increasingly demanding due to the mass production capacity provided by microinjection and micro hot-embossing processes. Polymer based MEMS depend on material properties to be technically and economically feasible in order to respond to market demands. Microinjection moulding became one of the most effective means for mass production of polymer based microcomponents where geometrical features like ultrathin walls and microchannels present challenges concerning the filling of the part. It has been demonstrated that in the micrometric domain, polymer fluid behaviour differs from conventional melt flow due to microscale effects such as surface tension, wall-slip and heat transfer. These effects have a significant influence on the microinjection processing conditions as well as on the overall quality of the moulded parts. Considering the constant appearance of new polymeric materials with enhanced properties, it is required to obtain updated rheological properties for a proper numerical simulation with accurate results. It has been demonstrated elsewhere that wall-slip occurs under critical conditions concerning polymer’s shear rate, enabling the establishment of critical values for polymer processing. In this study, the polymer flow in microchannels under realistic industrial conditions of microinjection moulding of several polymer materials will be assessed and characterized.