Are all ca30 tantalum capacitors silver case?

Yes.

Remember the CA30 is liquid electrolyte. The shells are pure silver. The tantalum block sintered is a platinum filament.

CA30 non-solid electrolyte tantalum capacitor CA30 non-solid electrolyte button capacitor has the advantages of small leakage current, large capacity, high operating voltage, stable and reliable use, etc. It is suitable for communication, aerospace and other electronic equipment in DC or pulsating circuit.