Environmental considerations: glazed to eliminate corrosion and possible silver migration due to the presence of moisture.

Red phosphorus, used as a charring-promoter flame retardant, facilitates silver migration when present in packaging.

Because the silver case in the past had problems with silver migration and whiskers, which led to increasing leakage currents and short circuits, new styles of wet tantalum capacitors use a sintered tantalum pellet cell and a gelled sulfuric acid electrolyte mounted in a pure tantalum case.