To achieve better control of the electrical parameters and to allow more precise ECP designs a new filler material has been developed. This new material is based on microscopic mica flakes with a typical platelet shape. To obtain the desired electrical characteristic the mica flakes are coated with a thin metal oxide layer. Depending on the metal oxide used, different nonlinearity exponents are possible. The intrinsic electrical resistance of the particles can be precisely adjusted by doping the thin oxide layer. The combination of the increased number of particles in the composite material and the platelet shape result in an overall resistance which is independent from the number of established conductive pathways and the contact resistance between particles. Hence the resulting composite material will show a much lower scattering range. It allows adjustment of a predefined electrical characteristic.
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