A fired composition, characterized in that it comprises a zinc compound and a tin compound and satisfies Wz ≥ Ws, wherein Wz represents the wt % of zinc oxide and Ws represents the wt % of tin oxide, both relative to the fired composition. The ratio of Wz to Ws is preferably in the range of 99/1 to 70/30, more preferably 95/5 to 85/15. The fired composition exhibits the corrosion resistance comparative to or superior to a lead compound and also is good in the stability of an electrodecomposition bath, and further, allows the omission of a conventional curing catalyst such as dibutyl tin oxide since it functions also as a curing agent.
