BÖHLER P804 is an iron-42% nickel alloy with low thermal expansion for applications in the electronics industry, for measuring devices (e.g. measuring rulers, scales), temperature measuring devices and temperature-dependent controls, thermostats, thermobimetals and expansion controllers. Other applications include core material for copper sheath wires, automotive and industrial lamps, transformer/capacitor bushings, electronic tubes, glass/ceramic to metal applications.
The minimum coefficient of thermal expansion of BÖHLER P804 is in the range of -30 to 275°C. Above the break point at just over 300°C, the coefficient of expansion increases sharply and at higher temperatures reaches the values usual for austenitic materials. Good low temperature properties.