Alloys: LEONI Histral® R55

Copper based resistance alloy, CuNi23Mn

Technical data

Nominal values: Tempered Hard
Resistivity* (Ohm mm2/m) 0.3000 0.3000
Electrical Conductivity* (% IACS) 6 6
Tensile Strength* (N/mm2) 350 650
Elongation* (%) 20 1
Temperature Coefficient of Resistance (1/°C) 0.00018 0.00018
Density (g/cm3) 8.9 8.9

* Data depend on coating conditions, degree of cold working and thermal treatments during manufacturing process 


  • DIN 17471


  • Coating: Bare, Silver, Nickel, Tin, Gold
  • Temper: Tempered or hard
  • Single end conductors
  • Stranded conductors
  • Bunched conductors
  • Concentric lay conductors
  • Single end size ≥ 0.05 mm (AWG 44)
  • Other diameters or special constructions are available

** Depending on material combination & construction

Excellent properties

Very high resistivity (specific resistance)

LEONI Histral® R55 is an ideal material for heating elements.

Very low temperature coefficient

This shows the relative change of resistance as the temperature rises or falls. Almost all metals have a positive temperature coefficient, meaning that as the temperature increases so does the resistance. This is of particular significance in heating cables and elements. The lower the temperature coefficient of a heating cable, the more uniform the heating power as temperature increases.

The temperature coefficient of LEONI Histral® R55 is 0.00018.

Special applications

  • Heating cables

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