Disclosed is an energy absorbing compound comprising an epoxidized vegetable oil, a thermoplastic polymer and a prepolymer. The primary printed circuit board is coupled to the secondary printed circuit board by a connector pin that protrudes out of a critical surface of the enclosure. At least a part of the mid-portion makes contact with the upper surface of the resin layer, and at least the both ends are positioned apart from the upper surface of the resin layer. The heat-activatible initiator is a mixture comprising at least one quarternary ammonium salt and at least one thermal radical former.