Invar 36 is a Nickel-Iron, low expansion alloy,available in plate,sheet, ... wire,tube,pipe,rod,bar,etc. Invar 36Invar 36 is a Nickel-Iron, low expansion alloy containing 36% Nickel, belongs ... resistivityohm-cir mil/ft ................... 495microhm-mm ...................... 820Temperature coefficient of electricalresistivityper °F (70/212°F) ............. 0.0006per °C (21/100°C) ............. 0.0011