Nine con). low- and high-d. polyethylenes and eight polyethylene waxes were studied for mass flow rate (MFR) indexes (capillary rheometer, 190-230 degrees C, mass loads 2,16-7,96 kg) and for viscosity (rotational rheometer, 120-230 degrees C), resp. Temp. relatioships of the resp. MFR indexes and viscosities were detd.