Ideal for electrical insulation – Steatite is mechanically very strong, resistant against ageing and UV radiation. Due to its special production characteristics, it is moreover dimensionally accurate and stable up to 1000 °C.

Steatite is an inorganic material based on natural raw materials consisting predominantly of magnesium silicate. Steatite is marked by a high heat resistance, resistance to leakage current and dielectric strength, which is why it is recommended as an insulation material in electrical engineering.

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Production & properties

Steatite is a silicate-ceramic material based on soapstone, with a proportion of 75 – 90 %.
Apart from soapstone, it also contains clay and flux agent.
Typical steatite materials are composed of 58 – 65 % SiO2, 26 – 32 % MgO, 3 – 6 % Al2O3, 1,3 % Na2O (for C 220), and 7 % BaO (for C 221).
The glass phase has a proportion of 25 – 45 %. The crystalline proportion consists of protoenstatite.

Mechanical stability values can be increased with the addition of zirconium oxide.

Typical moulding procedures are dry pressing, extrusion, ceramic injection moulding, slip casting and wet pressing.

The design examples illustrate the variety of shapes that can be achieved through dry pressing technology. When materials are substituted, the experiences of the manufacturer in terms of a ceramics-compatible construction should be taken into account from the very beginning.

Steatite is sintered at approx. 1300 °C. To retain dirt-repellent surfaces, steatite can also be glazed.

Steatite displays the following critical properties:

      • very good dielectric strength
      • tracking resistant
      • heat resistance and form stability up to 1000 °C
      • high mechanical strength
      • non-combustible
      • age-resistant
      • resistant to UV radiation



Its outstanding electrical insulation properties have made steatite one of the most important materials in electrical engineering. Some fields of application:

      • halogen sockets
      • NH fuses
      • insulators
      • thermostat switch casings

Apart from the aluminium oxide material RAPOX, steatite is also used as a high-voltage insulator.



We will be pleased to draw up an offer for you! For this purpose, we request a customer specification drawing, with details of quantities and required tolerances.

For very small tolerances the parts have to be grinded.


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