An accurate knowledge of heat transfer during forming processes (injection moulding, thermoforming...) is essential to predict shrinkage and warpage and consequently the quality of a thermoplastic part. Simulation requires the determination of both thermophysical properties and crystallization kinetics since they are intimately coupled and of the boundaries conditions at the part surface in conditions close to forming processes. Thus, we present the characterization of the crystallization at high cooling rate under high pressure conditions and also of the thermal contact resistance between the polymer and the mould, using three complementary apparatus. The crystallization kinetics at very high cooling rate is determined with a nanocalorimeter, the Mettler Toledo DSC Flash 1. The size reduction of samples allows the device to reach heating rates up to 20 000 K/s and cooling rates up to 10 000 K/s. The crystallization of a neat polypropylene or filled with black carbon, is presented. Avrami parameters are identified between 10°C and 140°C. The use of sample of several nanograms raises the question of the representativeness of the measure. In this context, the second device, called “Lagardère apparatus”, allows the study of the crystallization at the surface of a bulk part. It consists to put suddenly into contact a piston at 30°C and a molten polypropylene at 210°C. This apparatus also allows the direct measurement of the thermal contact resistance between the polymer and the piston. The impact of the pressure on the crystallization kinetics is studied through specific volume measurements. The third device is the PvT-xT, a home-made multifunctional apparatus, which allows the measurements of PvT diagram (Pressure–specific volume–Temperature), of the crystallization enthalpy and the identification of the crystallization kinetics under pressure. The applied conditions are close to processing conditions: high temperature up to 400°C and very high pressure up to 200MPa.