The epoxy casting technology is one of the important technologies in high-voltage switchgear manufacture.The combination of metal inserts and epoxy casting is of low mechanical properties

which is due to the difference between the linear expansion coefficients of epoxy casting material and metal inserts

and due to the weak soakage capability between epoxy casting and metal inserts. It is also necessary to pay special attention to enhancing mechanical properties of the epoxy casting in the epoxy casting process. In this paper

the coating on metal inserts and the combination of metal inserts and epoxy casting are discussed

and a new bonding process is proposed to enhance the bonding intensity between epoxy casting and metal inserts.