In this paper the polymerisation of linseed oil is studied in order to prov
e the catalytic action of some inorganic pigments. The results show that th
e calorimetric technique is able to monitor the polymerisation process in t
he temperature range between 130 and 220 degreesC; reproducible values for
isothermal analysis are obtained between 130 and 150 degreesC; finally the
results are quantitative and can be justified by kinetic equations.