... to form nickel phosphate, which dissolves in the copper on heating to a suitable temperature, and can ... still further.C19160 is nominally composed of 97.8% copper, 1.0% lead, 1.0% nickel and 0 ... phosphorus, while C19140 is nominally composed of 98.3% copper, 0.5% lead, 1.0% nickel and 0. ... heat treated, one can expect a conductivity of about 55% IACS. The lead content also imparts good machinability ...