Properties and Application Notes
The precision resistance alloy MANGANIN®, developed by Isabellenhütte, is especially characterized by low temperature coefficient between 20 and 50 °C with a parabolic shape of the R(T) curve, high long term stability of electrical resistance, extremely low thermal EMF versus copper and good working properties. Due to these features MANGANIN® is the standard material for precision, standard and shunt resistors. MANGANIN® is the basis for the production of ISA-PLAN® and ISA-WELD® components. The maximum working temperature in air is 140 °C.
However, higher thermal loads in a non-oxidizing atmosphere are possible. When used for precision resistors with the highest requirements, the resistors should be carefully stabilised and the application temperature should not exceed 60°C. Exceeding the maximum working temperature in air may result in a resistance drift generated by oxidizing processes. Thus, the long term stability can be affected negatively. As a result, the resistivity as well as the temperature coefficient of the electric resistance may slightly change. It is also used as low cost replacement material for silver solder for hard metal mounting.
Form of Delivery
MANGANIN® is supplied in the form of round wires in the range 8.0 to 0.02 mm Ø in bare or enamelled condition. The product line includes sheets, ribbons, flat wires, stranded wires, rods and tubes.
Notes on Treatment
MANGANIN® can be worked easily. Though the alloy can be soldered, it develops in air a thin oxide film; this must be removed before working. With an appropriate flux MANGANIN® is also suitable for dip-tinning. Furthermore, MANGANIN® can be brazed and welded. Resistors made of MANGANIN® must be aged in order to remove mechanical stress. For further details see Technical Information.