... ,pipe,rod,bar,etc. Invar 36Invar 36 is a Nickel-Iron, low expansion alloy containing 36% Nickel, belongs to one of the ... 0.50Max 0.004Max 0.006Max 0.35Max 0.25Nom 36.0BalancePhysical Properties:Specific gravity ................ 8.08Densitylb/cu in ......................... 0.291kg ...