Using natural fillers can provide several benefits as they are abundant, low cost, and non-toxic. In
this paper two different natural fillers were examined, rosehip seed flour and hemp fibres, both of
which were varied in weight ratios. A highly biobased unsaturated polyester resin was synthesized as
a matrix. Characterization of thus obtained composite materials consisted of examining mechanical
properties by uniaxial tensile test, FTIR spectroscopy and gel content analysis.
