Recent progress in interpretation of immersion calorimetry has shown the link between the immersion enthalpy (Delta(imm) H) value in apolar liquid and the Lifshitz-van der Waals contribution to surface energy (gamma(S)(LW)) of divided solids. In this work we show that a simple relationship can be established between the Hamaker constant (A(11)) of a solid and its immersion enthalpy in a pure apolar solvent, The results are satisfying compared to those already available in the scientific literature. The main interest of this method is the measurement of the Hamaker constants of solids for which contact angle measurements are impossible to carry out and for those for which the complexity of the solid structure hampers the ab initio calculation. Values are given for some clay minerals.