Silver mica capacitor

[1] They were put into large scale commercial production to meet military requirements in World War I. Mica is less prone to crack under mechanical shock than glass, a useful property for equipment subject to shellfire.

[2] In 1920 Dubilier developed a capacitor consisting of a flaked sheet of mica coated on both sides with silver.

These had even worse tolerance and stability than other clamped capacitors since the mica surface is not perfectly flat and smooth.

There is a high level of compositional variation in the raw material leading to higher costs in relation to inspection and sorting.

Silver Mica capacitors are used at 100 V to 10 kV, ranging from a few pF up to a few nF, and the average temperature coefficient is around 50 ppm/°C.