Invar® 42 is a nickel-iron, controlled-expansion alloy containing 42 percent nickel. It has a low and nominally constant coefficient of thermal expansion form room temperature to about 570°F (300°C). Invar® 42 is used for semiconductor lead frames in integrated circuits, bi-metal thermostat strip, thermostat rods, for ceramic-to-metal seals with alumina ceramics, and various glass-to-metal seals such as the core of copper-clad wire for sealing into glass envelopes of electric bulbs, radio valves, television tubes and fluorescent lights. Standard product forms are tube, sheet, strip and wire.
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Item #

Thickness

Thickness

Alloy

Density

N42-250 N/A 1/4 inches N/A 0.25 inches6.3500 mm N/A Invar® 42 N/A 0.293 lbs/in³8.11 g/cm³
N42-3750 N/A 3/8 inches N/A 0.375 inches9.5250 mm N/A Invar® 42 N/A 0.293 lbs/in³8.11 g/cm³
N42-5000 N/A 1/2 inches N/A 0.500 inches12.7 mm N/A Invar® 42 N/A 0.293 lbs/in³8.11 g/cm³
N42-7500 N/A 3/4 inches N/A 0.750 inches19.05 mm N/A Invar® 42 N/A 0.293 lbs/in³8.11 g/cm³
N42-1000 N/A 1 inches N/A 1.000 inches25.4 mm N/A Invar® 42 N/A 0.293 lbs/in³8.11 g/cm³
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