The molar heat capacity C-p,C-m of 1-cyclohexene-1,2-dicarboxylic anhydride was measured in the temperature range from T = (80 to 360) K with a small sample automated adiabatic calorimeter. The melting point T-m, the molar enthalpy Delta(fus)H(m) and the entropy Delta(fus)S(m) of fusion for the compound were determined to be (343.46 +/- 0.24) K, (11.88 +/- 0.02) kJ(.)mol(-1) and (34.60 +/- 0.06) J (.) K-1 (.) mol(-1), respectively. The thermodynamic functions [H-(T) - H-(298.15)] and [S-(T) - S-(298.15)] were derived in the temperature range from T= (80 to 360) K with temperature interval of 5 K. The mass fraction purity of the sample used in the adiabatic calorimetric study was determined to be 0.9928 by using the fractional melting technique. The thermal stability of the compound was investigated by differential scanning calorimeter (DSC) and thermogravimetric (TG) technique, and the process of the mass-loss of the sample was due to the evaporation, instead of its thermal decomposition. (C) 2004 Elsevier Ltd. All rights reserved.