Dielectric ceramic materials are used for our range of high voltage capacitors because of their capability to support electrical fields and/or to act as insulators. We prepare our own dielectrics from raw materials at our Ruabon manufacturing site with Dielectric Constants from 6 to 5000 which allows us to design and manufacture capacitors from 5 to 10,000pF in voltage ranges from 5kV to 50 kV.
High voltage capacitors use materials with high dielectric constant and therefore excellent volumetric efficiency. These are normally identified as Class 2 types and can be found in various applications including live line indication in electricity distribution networks and X-ray imaging power supplies.
They do not have the low dissipation factors and stability with voltage and temperature associated with Class 1 capacitors and it should be noted that the capacitance will decrease over time for many of these materials. The ageing rate is normally quoted as a % per decade hour and for products the stated capacitance specification is associated with a defined period of time.
We also produce our own dielectric ceramics for niche resonator or filter applications at frequencies from 50MHz to 15GHz. These deliver high Q and very low temperature coefficient of frequency on a consistent basis. The D36 material has very low magnetic susceptibility making it ideal for use in medical imaging and therapy applications where non-magnetic components are required.