... known as Kovar, is a controlled expansion alloy consisting of 29% Nickel, 17% Cobalt, and balance Iron. Kovar is produced to ensure ... K, Pernifer 2918, Rodar, and Dilvar P1.Alloy 42Alloy 42 is a controlled expansion alloy, consisting of 42% Nickel, balance Iron; used in ... as Pernifer 42, NILO 42, and Glass-Seal 42.Alloy 46A controlled expansion alloy, consisting of 46% Nickel, balance Iron; used in a ...