Curing reactions of low-density polyethylene (LDPE) and polydimethylsiloxane (PDMS) rubber blends have been investigated by Differential Scanning Calorimetry (DSC) and by Rheometry. From the DSC thermograms the kinetic parameters have been calculated. The order of the reaction has been found to be first order. The optimum level of peroxide was found to be 1.5 pbw. The activation energy of the blends was found to be higher than that calculated as per additivity rule which is indicative of an interaction of the blends constituents. Improved mechanical properties of the blends on curing is indicative of cure compatibility of the blends.