The kinetics of pyrolysis of two epoxide resins，hardened by maleic anhydride and by triethylenetetraamine，were studied by thermo—gravimetry．A comparison of various methods isothermal and non-isothermal thermo-gravime-try shows that the non-isothermal method gave sufficiently accurate kinetic data，as the isothermal method．The non-isothermal method is less time consuming and probably gives more representative values for the whole heating range．Kinetic data of isomerization of epoxy-groups have been obtained by differential thermal analysis．Useful informations about the chemical changes thking place in the heating process of epoxide resins can be obtained by ioint use of non-isothermal thermo-gravimetry，dif-ferential thermal analysis and thermo—mechanical methods．