Abstract: An essentially non-aqueous electrolyte composition for aluminum-anode capacitors is disclosed comprising ethylene glycol and a salt such as the ammonium or amine salt of an unsaturated dicarboxylic acid with or without a small amount of an additive such as boric acid, phosphoric acid, ammonium dihydrogen phosphate, ammonium pentaborate, ammonium phosphate and mixtures thereof. The electrolyte offers high electrical conductivity, and greatly increased stability and shelf life, under conditions of no voltage, for low voltage capacitors having high capacitance ratings. In one embodiment, the combination of ethylene glycol, as the solvent, with between about 0.001 to 0.1 mole of unsaturated dicarboxylic acid per mole of ethylene glycol and about 0.001 to 0.1 mole of the salt per mole of ethylene glycol is used. Other embodiments are disclosed.

Abstract: An electrolytic capacitor which may use dimethyl formamide as the electrolyte has a metal housing and a variable thickness molded glass or mineral filled plastic header having a bolster ring adjacent the peripheral edge of the header, major rib members molded on the header which cooperate with further retainer members located at the bottom of the capacitor housing to retain the housing in position, and radial and circumferential members located within said bolster ring on the under side of said header certain of which members are of smaller thickness than the bolster ring, and which further includes areas of relatively thin dimensions located betweeen said circumferential members and said bolster ring, and between said rib members and said circumferential members.