... -year experience 2,AgCdO,AgSnOInO,AgNi,AgZnO,AgCu,Cu 3,Usage:relay,switch,contactor,breaker,thermostat 4,ISO9001,SGS Contact type ... its surface is not liable to oxidization. The addition of 3 - 28% copper may remarkably improve the silver's flame ... it is more difficult to processing these two materialsUsage:Breaker,relay,contactor,timer,thermostat,train,swithes and other home appliances and electrical ...