Alloys: LEONI Histral® R20

Pure nickel, Ni99.6

Technical data

Nominal values: Tempered Hard
Resistivity* (Ohm mm2/m) 0.0800 0.0840
Electrical Conductivity* (% IACS) 22 21
Tensile Strength* (N/mm2) 380 760
Elongation* (%) 15 1
Temperature Coefficient of Resistance (1/°C) 0.00600 0.00600
Density (g/cm3) 8.9 8.9

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


  • DIN 17740


  • Coating: Bare
  • Temper: Tempered or hard
  • Single end conductors
  • Stranded conductors
  • Bunched conductors
  • Concentric lay conductors
  • Single end size from Ø 0.15 mm to Ø 0.51 mm (AWG34 to AWG24)
  • Other diameters or special constructions are available

** Depending on material combination & construction

Excellent properties

Medium electrical conductivity

On account of a good resistance value and a comparatively high temperature coefficient LEONI Histral® R20 boasts a good-enough conductivity of 20% IACS.

Outstanding mechanical properties

LEONI Histral® R20 possesses outstanding strength properties in both hard and soft condition. Its tensile strength amounts to 760 N/mm² in hard condition and still keeps a level of 380 N/mm² in soft condition. Thus, the corresponding values for pure copper are easily outmatched.

Very good temperature resistance

The high mechanical resilience of LEONI Histral® R20 remains unaffected even at a high thermal load. This makes the material an extremely good choice for connecting wires that are exposed to high temperatures.

Excellent corrosion resistance

At room temperature, LEONI Histral® R20 features a high resistance to environmental impacts such as air and water, and to decomposing chemicals like hydrochloric acid and alkalis. Therefore, pure nickel conductors are also well suited for challenging environments.

High Temperature Coefficient of Resistance

This ratio indicates by how much the resistance in the conductor rises in the event of its temperature going up by 1°C. All metals have a positive temperature coefficient, meaning that as the temperature increases so does the resistance.
The temperature coefficient of LEONI Histral® R20 has a value of 0,00600 1/°C. So it ranks at the top tier of all common conductor materials.

Special applications

Electrodes in spark plugs

Whenever a certain heat rating in a spark plug is required, the material used for the electrode is frequently pure nickel (LEONI Histral® R20).

Heating cables

Cables can be used to heat quite a diverse range of objects. The most important aspect for outdoor applications is protection against humidity, frost and icing. There, cables are usually laid in or right on the object, e.g. when it comes to roof gutters, water pipes, containers, satellite dishes or walls, foundations and road surfaces. For indoor purposes, heating cables are employed because of the cozy warmth they radiate, with typical application areas being floors, walls or bench seats, inside which they are placed.All these applications call for the conductor material to be as insusceptible as possible to external influences and partly to mechanical stress as well.

Connecting wires for heating conductors and halogen bulbs

Connecting wires and hookup wires are often exposed to high temperatures. This does not only apply to cables used in bakeries, foundries, iron and steel works, but also in the vicinity of saunas, solariums, oil burners, electric stoves or lighting appliances.

Control units in extremely temperature-sensitive areas

There are a lot of situations where it is quite difficult to measure temperatures exactly over longer periods or in places that are inaccessible. By using a suitable conductor the temperature inside it can be inferred from how its resistance changes. The following rule of thumb applies: the higher the temperature coefficient of the resistance, the more accurate the measurement. With its temperature coefficient of 0.00600 1/°C, LEONI Histral® R20 lends itself exceptionally to temperature-sensitive areas of application.

Further fields of application:

  • Electrical resistors
  • Industrial applications as resistance wires
  • Non-corroding components
  • Build-in components for light bulbs and electron tubes

Custom solution services

You need special designs and products for your applications?

Our R&D team is your partner for customised solutions.

Please contact!