ʻO ka monel 400 alloy he nickel copper alloy i loaʻa ka ikaika kiʻekiʻe ma luna o kahi ākea ākea a hiki i 1000 F. Ua manaʻo ʻia ʻo ia ka ductile Nickel-Copper alloy me ke kūʻē i nā ʻano ʻano corrosive.