The paper deals with the study physical-mechanical properties of polypropylene composites in dependence on amount of hollow glass microspheres in matrix. Composite material compounded by method "Water cooling strand pelletizing" consists of polypropylene, adhesion promoter and hollow glass microspheres with average diameter (18÷20) μm and different density: 0,46 g/cm3 (iM16K) and 0,60 g/cm3 (iM30K). Measured results are compared with talc filled polypropylene. In terms of experimental measurement is by the differential scanning calorimetry method evaluated also course of prepared composites crystallization. Finally there are concluded measured results not only regarding utility properties of parts but regarding also possibilities to control and optimize processing process.
