Alloys: LEONI Histral® R51

Copper based resistance alloy, CuNi2

Technical data

Nominal values: Tempered Hard
Resistivity* (Ohm mm2/m) 0.0500 0.0500
Electrical Conductivity* (% IACS) 35 34
Tensile Strength* (N/mm2) 220 480
Elongation* (%) 18 1
Temperature Coefficient of Resistance (1/°C) 0.00130 0.00130
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

High resistivity (specific resistance)

LEONI Histral® R51 is an ideal material for heating elements.

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® R51 is 0.00130.

Special applications

  • Heating cables

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