Dumet wire is used as seal materials for glass-to-metal of electro-vacuum device . it is manufactured by wrapping or electroplating copper on the Fe-Ni alloy bar (or wiresurfact by drawing.annealing and borating trea***nt. The product has The product has red dumet wire, pale (golden yellow) dumet wire, white dumet wire, unborated dumet wire and wateproof type dumet wire