Silver micas cost more and had a better spec for capacitance, temperature as
well as aging and are used in circuits where you want to minimize frequency
drift.
IIRC silver was plated somehow onto the higher grade mica whereas ordinary
micas used a lower grade o f mica and weren't plated or plated as well.

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73
Hank WD5JFR
"Z.Z." wrote in message
...
What's the difference between a silver mica cap and a plain old mica cap?
Is there any? I mean with respect to size, performance, stability, voltage
ratings, etc. Where would one be used instead of the other?

Thanks...