[R-390] silver-mica capacitor failures

[Charles Steinmetz]

David wrote:

> Thanks for describing dipped-mica construction.  I don't know what the molded mica bodies are made of; I just guessed.  It's hard and breaks with a grainy texture, which made me think of Bakelite.  What do you think it is?

My best guess is some form of hard rubber (a.k.a. vulcanite, a.k.a. 
Ebonite).  This family of materials yields quite a variety of physical 
characteristics, generally similar to Bakelite but 
somewhat-to-considerably less brittle.

Berst regards,

Charles