Abstract: A conductive polymer hybrid aluminum electrolytic capacitor having a high withstand voltage with a rated voltage of 63 V or higher, high heat resistance to high temperature reflow solder, and durability and reliability under high temperature environment with 125° C. or higher is provided. In a conductive polymer hybrid aluminum electrolytic capacitor having an electrolytic solution and a cathode with conductive polymer, the electrolytic solution contains a solute and a solvent, the solvent contains diethylene glycol and/or triethylene glycol as a main component, the solute contains a long-chain dibasic carboxylic acid with 12 or more carbon atoms and an amine with a high boiling point, and the electrolytic solution is contained in a space of the capacitor element to which a solid electrolytic layer by conductive polymer is formed.

Abstract: An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolyte solution. The solid electrolyte layer includes a ?-conjugated conductive polymer. The electrolyte solution contains a solvent and a solute, and the solvent contains a glycol compound and a sulfone compound. A proportion of the glycol compound contained in the solvent is 10% by mass or more. A proportion of the sulfone compound contained in the solvent is 30% by mass or more. A total proportion of the glycol compound and the sulfone compound contained in the solvent is 70% by mass or more.

Abstract: An electrolytic capacitor includes an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer of the anode body; and an electrolytic solution. The electrolytic solution contains a solvent and a solute. The solvent contains a glycol compound. The solute contains an acid component and a base component. A mass of the acid component in the solute is greater than a mass of the base component in the solute. The acid component contains a first aromatic compound having a hydroxyl group.

Abstract: An electrolytic capacitor includes: an anode body having a dielectric layer; a solid electrolyte layer in contact with the dielectric layer; and an electrolytic solution. The electrolytic solution contains a solvent and a solute. The solvent contains a glycol compound. The solute contains a carboxylic acid component and a base component. A ratio of the carboxylic acid component in the solute is 200 parts by mass or more with respect to 100 parts by mass of the base component.

Abstract: Two electrodes are drawn out from a wound capacitor element by a pair of leads. Each of electrodes forming the capacitor element includes a sheet-like collector, an electrode layer formed on the surface of the collector, and an exposed part provided on one edge of the collector. The electrode layer is not formed on the exposed part. The electrodes are wound such that the exposed parts come to both ends of the capacitor element. Two or more points of at least one of the exposed parts are connected together.

Abstract: This disclosure relates to an electrolyte for an aluminum electrolytic capacitor. An electrolyte according to one embodiment includes a protic fluid and a high dielectric co-solvent or a dipolar aprotic. According to various embodiments, the electrolyte is pH buffered to less than approximately 6.8 pH. The protic fluid includes ethylene glycol and the high dielectric co-solvent includes N-methylformamide, in various embodiments. The disclosure further relates to methods for manufacturing an electrolyte, and capacitors and implantable devices including a supporting electrolyte selected for optimal cation size and charge and anion solubility.

Abstract: A hydrophobic film is formed on the electrode foil surface by adding a straight-chain saturated dicarboxylic acid represented by the general formula: HOOC(CH2)nCOOH (wherein n indicates an integer from 9 to 11) to the electrolytic solution for medium/high-voltage electrolytic capacitor. Addition of a large amount of water to the electrolytic solution is allowed since this hydrophobic film suppresses the hydration reaction between the electrode foil and water. Further, it is possible to retain good lifespan property of the electrolytic capacitor in a medium/high-voltage electrolytic solution by having low specific resistance property and by suppressing the hydration decomposition of the electrode foil, wherein the electrolytic solution is azelaic acid, sebacic acid, 1-methyl-azelaic acid, 1,6-decanedicarboxylic acid, or a salt thereof dissolved in a solvent having ethylene glycol as the main component.

Abstract: An electrolytic capacitor includes a capacitor element, an electrolyte solution with which the capacitor element is impregnated, and an outer package enclosing the capacitor element and the electrolyte solution. The capacitor element includes an anode foil having a dielectric layer on a surface thereof, a cathode foil, a separator disposed between the anode foil and the cathode foil, and a solid electrolyte layer in contact with the dielectric layer of the anode foil and the cathode foil. The electrolyte solution contains a low-volatile solvent that is at least one of polyalkylene glycol and a derivative of polyalkylene glycol.

Abstract: Disclosed are hydroxy terminated alkylsilane ethers with oligoethylene oxide substituents. They are suitable for use as electrolyte solvents and particularly well suited for use with aqueous environment electrolytic capacitors. Methods for synthesizing these compounds are also disclosed.

Abstract: An electrolytic capacitor that contains an anodically oxidized porous anode, cathode, and an electrolyte that contains an alkali metal salt and ionically conductive polymer is provided. The alkali metal salt forms a complex with the ionically conductive polymer and thereby improves its ionic conductivity, particularly at higher temperatures. The electrolyte also contains an organic solvent that reduces the viscosity of the electrolyte and helps lower the potential barrier to metal ion transport within the electrolyte to improve conductivity. By selectively controlling the relative amount of each of these components, the present inventors have discovered that a highly ionically conductive electrolyte may be formed that is also in the form of a viscous liquid. The liquid nature of the electrolyte enables it to more readily enter the pores of the anode via capillary forces and improve specific capacitance. Further, although a liquid, its viscous nature may inhibit the likelihood of leakage.

Abstract: The present invention provides an electrolytic solution for aluminum electrolytic capacitors which has a high sparking voltage while maintaining its specific conductivity at 30° C. of 4 to 25 mS/cm and which has no possibility of corroding capacitor elements, and an aluminum electrolytic capacitor using the same. The electrolytic solution of the present invention is characterized as being an electrolytic solution containing an electrolyte (C) composed of an alkyl phosphate anion (A) represented by formula (1) or (2) given below and a cation (B), and an organic solvent (D), wherein the content of phosphoric acid in the electrolytic solution is 1% by weight or less: wherein R1 is an alkyl group having 1 to 10 carbon atoms and R2 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.

Abstract: A capacitor for an implantable medical device is presented. The capacitor includes an anode, a cathode, a separator therebetween, and an electrolyte over the anode, cathode, and separator. The electrolyte includes ingredients comprising acetic acid, ammonium acetate, phosphoric acid, and tetaethylene glycol dimethyl ether. The capacitor has an operating voltage ninety percent or greater of its formation voltage.

Abstract: An electrical double layer capacitor comprises an element and a case which houses the element. The element has an anode charge collector, anode, separator, cathode and cathode charge collector. The anode and cathode consist of a porous layer containing electrically conducting porous particles as a constituent material. The anode charge collector is disposed in electrical contact with the anode. The cathode charge collector is disposed in electrical contact with the cathode. The thickness of the element is 600 ?m or less. The sum of the anode thickness and cathode thickness is set to 80% or less of the thickness of the element.

Abstract: A conductive electrolyte comprises an indicator dye for facilitating detection of electrolyte leakage in a high voltage electrolytic capacitor as well as for facilitating the determination as to when an electrolyte has reached a desired pH range. In a method for detecting electrolyte leakage, a capacitor comprising a flat stack of anodes enclosed in a housing with a lid and an electrolyte comprising an indicator dye is inspected for the presence of electrolyte leaking out of the capacitor. The indicator dye facilitates viewing leaking electrolyte. The indicator dye can be a coloring agent that changes the color of the electrolyte or can be a fluorescent that fluoresces when exposed to ultraviolet light. The indicator dye is also utilized as a pH indicator during the manufacture of electrolytic capacitors, wherein a base is introduced into an electrolyte having an indicator dye that changes pH when the electrolyte turns basic.

Abstract: Devices formed of or including biocompatible polyhydroxyalkanoates are provided with controlled degradation rates, preferably less than one year under physiological conditions. Preferred devices include sutures, suture fasteners, meniscus repair devices, rivets, tacks, staples, screws (including interference screws), bone plates and bone plating systems, surgical mesh, repair patches, slings, cardiovascular patches, orthopedic pins (including bone filling augmentation material), adhesion barriers, stents, guided tissue repair/regeneration devices, articular cartilage repair devices, nerve guides, tendon repair devices, atrial septal defect repair devices, pericardial patches, bulking and filling agents, vein valves, bone marrow scaffolds, meniscus regeneration devices, ligament and tendon grafts, ocular cell implants, spinal fusion cages, skin substitutes, dural substitutes, bone graft substitutes, bone dowels, wound dressings, and hemostats.

Abstract: An electrolytic solution for operating electrolytic capacitors which deteriorates extremely little in electrical properties even when used in a high-tension capacitor. The electrolytic solution comprises a compound expressed by general formula (1) below and a compound expressed by general formula (2) below or their salts: where each R is a same or different alkyl group, and R? is hydrogen, a methyl group or an ethyl group, and n is an integer of 0 to 14.

Abstract: Devices formed of or including biocompatible polyhydroxyalkanoates are provided with controlled degradation rates, preferably less than one year under physiological conditions. Preferred devices include sutures, suture fasteners, meniscus repair devices, rivets, tacks, staples, screws (including interference screws), bone plates and bone plating systems, surgical mesh, repair patches, slings, cardiovascular patches, orthopedic pins (including bone filling augmentation material), adhesion barriers, stents, guided tissue repair/regeneration devices, articular cartilage repair devices, nerve guides, tendon repair devices, atrial septal defect repair devices, pericardial patches, bulking and filling agents, vein valves, bone marrow scaffolds, meniscus regeneration devices, ligament and tendon grafts, ocular cell implants, spinal fusion cages, skin substitutes, dural substitutes, bone graft substitutes, bone dowels, wound dressings, and hemostats.

Abstract: A driving electrolyte containing a solvent, a solute containing the following compounds represented by General Formulae (1) and (2) prepared by synthesis, and a nitro compound, (wherein, each of R1 and R2 is independently an alkyl group; each of M1 and M2 is a functional group selected from the group consisting of a hydrogen atom, an ammonium group and an amine group; and n is an integer of 0 to 14), (wherein, R3 is an alkyl group; R4 is a functional group selected from the group consisting of a hydrogen atom, a methyl group and an ethyl group; M3 is a functional group selected from the group consisting of a hydrogen atom, an ammonium group and an amine group; and m is an integer of 0 to 14).

Abstract: An electrolyte for use with an aluminum electrolyte capacitor includes a glycol/boric acid/borate compound, traces of water, and an inhibitor to suppress corrosion of an aluminum oxide coating of the capacitor. The inhibitor contains a weak organic acid and at least one acid group selected from among carboxylic acid, sulfonic acid, phosphonic acid, and an acidic derivative of carboxylic acid, sulfonic acid, and phosphonic acid.

Abstract: An electrolytic capacitor comprising an anode, cathode and an electrolyte. The electrolyte comprises: about 35-60%, by weight water; about 10-55%, by weight organic solvent; about 0.05 to 10%, by weight, sulphuric acid; about 0.05 to 10%, by weight, boric acid; and about 0.05 to 10%, by weight, phosphorus oxy acid.

Abstract: An electrolyte includes (a) 70-99 wt. % of ethylene glycol, and (b) 1-2 wt. % of a substance which is selected from a group that includes the following carboxylic acids and carboxylic acid salts: substituted cinnamic acids, ammonium cinnamate, ammonium ?-methyl cinnamate, and ammonium trans-4-phenyl-3-butenoate. The electrolyte may be used in an aluminum electrolytic capacitor.

Abstract: The present invention relates to a compound formula (I) wherein X1 is bond or —O—CH2—, (II) or (III) R1 is hydrogen or an amino protective group, a is phenyl, indolyl or carbazolyl, each of which may be substituted with one or two substituent(s), and B is hydrogen; halogen; lower alkyl; lower alkoxycarbonyl; cyclo(lower)alkyl; or a heterocyclic group, naphthyl, 1,2,3,4-tetrahydronaphthyl, benzyl or phenyl, each of which may be substituted with one or two substituent(s), or a salt thereof. The compound (I) of the present invention and pharmaceutically acceptable salts thereof are useful for the prophylactic and/or the therapeutic treatment of pollakiures or urinary incontinence.

Abstract: The present invention is directed toward an enhanced very high volt electrolyte for use in electrolytic capacitors. In particular, by the inclusion of a polymer matrix of a hydrogel, preferably of the family of poly(hydroxy alkyl methacrylate) but also including polyvinylalcohol (PVA), polyacrylonitrile (PAN), into a standard fill electrolyte, the breakdown voltage of the enhanced very high volt electrolyte of the present invention is raised to as much as 800 V. An electrolytic capacitor impregnated with the enhanced very high volt electrolyte of the present invention, is capable of operating at a voltage of 700 to 800 volts. The production of a very high volt capacitor capable of operating at a voltage of 700 to 800 volts allows a single high volt electrolytic capacitor to replace the conventional two capacitors-in-series arrangement of an Implantable Cardioverter Defibrillator (ICD).

Abstract: The present invention is directed to a conductive electrolyte for use in high voltage electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and a polar organic cosolvent. Dissolved in this mixture is a combination of: a high dielectric cosolvent, a long chain monocarboxylic acid and an aliphatic dicarboxylic acid of carbon chain length from eight to thirteen (C8 to C13). The solution is then neutralized with an amine. A cathode depolarizer, or degassing agent may be added to reduce the amount of gas produced during capacitor life. Hypophosphorous acid may be added to enhance the life characteristics of the electrolyte. The water content may be adjusted with deionized water to achieve a Karl Fischer titration (water content) measurement of about 1.0% to about 8.

Abstract: The present invention is directed to a conductive electrolyte for use in high voltage electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and a polar organic cosolvent from the group of 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, hexyl alcohol, or di(ethylene glycol). Dissolved in this mixture is a combination of boric acid with either an aliphatic dicarboxylic acid of carbon chain length from eight to thirteen (C8 to C13) or a very long chain dicarboxylic acid, where the acid functional groups are separated by 34 carbons (referred to as “dimer acid”). The solution is then neutralized with an amine.

Abstract: The invention is directed to an ethylene glycol mixture that also includes diethylene glycol monobutylether in addition to ethylene glycol and sorbitol. As a result thereof the ethylene glycol mixture exhibits a high dielectric strength (up to 66 V), a low water content and self-extinguishing properties for employment as electrolyte in an aluminum electrolytic capacitor. The invention is also directed to an aluminum electrolytic capacitor with the ethylene glycol mixture and to the employment of the ethylene glycol mixture in aluminum electrolytic capacitors for voltages up to 600 V.

Abstract: The present invention is directed to a high voltage, highly conductive electrolyte for use in electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and N-methylformamide; a combination of hypophosphorous acid, boric acid and an aliphatic dicarboxylic acid of carbon chain length from eight to twelve, such as azelaic, sebacic, or brassylic acid; an amine including ammonia, ammonium hydroxide, diethylamine, dimethylamine, triethylamine, or triethanolamine; and a nitro-substituted aromatic compound as a degassing agent, such as 3′-nitroacetophenone. Anhydrous ammonia may also be added to neutralize the solution.

Abstract: The present invention is directed to a conductive electrolyte for use in high voltage electrolytic capacitors and to an electrolytic capacitor impregnated with the electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte according to the present invention is composed of a two solvent mixture of ethylene glycol and di(ethylene glycol); a combination of boric acid with an aliphatic dicarboxylic acid of carbon chain length from eight to thirteen, such as suberic, azelaic, sebacic, undecanedioic, dodecanedioic, or brassylic acid; a very long chain dicarboxylic acid, where the acid moieties are separated by 34 carbons; and a nitro-substituted aromatic compound as a degassing agent, such as 3-nitroacetophenone or 2-nitroanisole. This electrolyte is then titrated with a light amine such as ammonia, diethylamine, dimethylamine, trimethylamine, or triethylamine.

Abstract: The present invention is directed to a gelled electrolyte and to an electrolytic capacitor impregnated with the gelled electrolyte of the present invention for use in an implantable cardioverter defibrillator (ICD). The electrolyte gel according to the present invention is generated by the addition of a gelling agent, preferably D-mannitol, to a conventional electrolyte. The gelling agent of the present invention can be used in ethylene glycol based electrolyte systems with or without a polar organic cosolvent. Dissolved in this mixture is an aliphatic dicarboxylic acid of carbon chain length from eight to thirteen (C8 to C13) as the ionogen. In order to achieve the necessary electrolyte conductivity, an amine is added to adjust the electrolyte pH to within a range of 6-10. An amount of D-mannitol is added to the electrolyte to reach the final weight percent of 8-15% by weight of the total electrolyte mixture.

Abstract: The present invention is directed toward an enhanced very high volt electrolyte for use in electrolytic capacitors. In particular, by the inclusion of a polymer matrix of a hydrogel, preferably of the family of poly(hydroxy alkyl methacrylate) but also including polyvinylalcohol (PVA), polyacrylonitrile (PAN), into a standard fill electrolyte, the breakdown voltage of the enhanced very high volt electrolyte of the present invention is raised to as much as 800 V. An electrolytic capacitor impregnated with the enhanced very high volt electrolyte of the present invention, is capable of operating at a voltage of 700 to 800 volts. The production of a very high volt capacitor capable of operating at a voltage of 700 to 800 volts allows a single high volt electrolytic capacitor to replace the conventional two capacitors-in-series arrangement of an Implantable Cardioverter Defibrillator (ICD).

Abstract: A mixture of long-chain dibasic acids comprising one or more long-chain dibasic acid having an alkyl group at its side chain and one or more long chain dibasic acid having a carbon chain of 8 or more carbon atoms between both its carboxyl groups and having an alkyl group and one or more alkoxycarbonyl group at its side chain is provided. This mixture can be used as the electrolyte of an electrolytic solution for electrolytic capacitors. This electrolytic solution can be produced very simply, hardly raises any precipitation at low temperatures and is tolerant to high voltage.

Abstract: An electrolyte for activating an electrolytic or electrochemical capacitor is described. The electrolyte preferably includes a mixed solvent of water and ethylene glycol having an ammonium salt dissolved therein. An acid such as phosphoric or acetic acid is used to provide a pH of about 3 to 6. The electrolyte is particularly useful for activating a ruthenium oxide/tantalum capacitor having an anode breakdown voltage in the range of 175 to 300 volts.

Abstract: The invention relates to an electrolyte for driving electrolytic capacitor and an electrolytic capacitor using the same, and by preparing by using a solvent mainly composed of organic compound, and dissolving one or more solutes selected from the group consisting of inorganic acids and organic acids, more specifically adding and dissolving at least one of copolymers of polyethylene glycol and polypropylene glycol shown in formulas (1) and (2), or both of the copolymers of polyethylene glycol and polypropylene glycol shown in formulas (1) and (2) simultaneously, the spark generation voltage and chemical conversion factor of formed oxidation film are enhanced, thereby improving the reliability of the electrolytic capacitor.HO--(C.sub.2 H.sub.4 O).sub.n --(C.sub.3 H.sub.6 O).sub.m--(C.sub.2 H.sub.4 O).sub.n --H (1)(n and m are arbitrary natural numbers.)HO--?(C.sub.2 H.sub.4 O).sub.n --(C.sub.3 H.sub.6 O).sub.m !.sub.i --H(2)(n, m, and 1 are arbitrary natural numbers.

Abstract: An electrolytic capacitor having aluminum anode and cathode members separated by a paper insulating spacer impregnated with a solution of mostly a glycol, water, unsaturated aliphatic dicarboxylic acid, aliphatic diene monocarboxylic acid, monohydric aliphatic alcohol, dodecanedioic acid, phosphoric acid, nitro aromatic compound having a benzene ring-substituted nitro moiety and a dialkylamine in an amount sufficient to provide a pH of 7.0-8.5.

Abstract: An electrolytic capacitor having aluminum anode and cathode members separated by a paper insulating spacer impregnated with a solution of mostly a glycol or a glycol ether and minor amounts of water, pelargonic acid, isophthalic acid or terephthalic acid and an aliphatic amine sufficient to provide a pH of 7.2-7.5.

Abstract: An electrolyte for driving an electrolytic capacitor comprising an organic solvent, at least one ammonium carboxylate and, at least one solute selected from the group consisting of quaternary ammonium borates and quaternary ammonium phosphates. An electrolyte further containing a polymer is disclosed. The polymer includes a polyether polyol represented by the following formula: ##STR1## where, 1.sub.1, 1.sub.2, 1.sub.3, m.sub.1, m.sub.2, m.sub.3, n.sub.1, n.sub.2, and n.sub.3 are positive integers, and 2.ltoreq.(1.sub.1 +m.sub.1).times.n.sub.1 .ltoreq.50, 2.ltoreq.(1.sub.2 +m.sub.2).times.n.sub.2 .ltoreq.50 and 2.ltoreq.(1.sub.3 +m.sub.3).times.n.sub.3 .ltoreq.50, andR.sub.1, R.sub.2 and R.sub.3 independently represents a hydrogen atom, which may be substituted one another by the same or different isocyanate residue or acrylic residue, wherein each end of the isocyanate residue or acrylic residue may be three-dimensionally linked.

Abstract: Disclosed is an electrolyte for an electrolytic capacitor which comprises a salt of a tertiary dicarboxylic acid represented by the following formula (I) or (II): ##STR1## wherein n represents an integer of 1 to 5, and R.sup.1 to R.sup.4 each represents an alkyl group having 4 or less carbon atoms, ##STR2## wherein n has the same meaning as defined above, l and m each represents an integer of 4 or 5, and R.sup.5 and R.sup.6 each represents hydrogen atom, methyl group or ethyl group,and an electrolytic capacitor using the same.

Abstract: An electrical capacitor having aluminum anode and cathode members separated by an insulating spacer impregnated with an electrolyte consisting of a solution containing from 50%-70% by weight of N-methylformamide, up to 30% by weight of 2-methoxyethanol, 2-ethoxyethanol, ethylene glycol or 1,2-propylene glycol, 12-20% by weight of an aromatic dicarboxylic acid selected from the group consisting of isophthalic acid and terephthalic acid, from 4%-10% by weight of dimethylamine or monomethylamine, the ratio of the amine to the dicarboxylic acid being less than 2.00:1 and greater than 1.67:1, up to 0.5% by weight of pelargonic acid, up to 0.1% by weight of phosphoric acid and up to 8% by weight of water.

Abstract: An electrolyte for an electrolytic condenser, more particularly for improving electric properties thereof, such as a specific resistance, is disclosed which comprises an ammonium salt of enanthic acid as a solute dissolved in a solvent consisting of ehtylene-glycol.

Abstract: An electrolytic capacitor employs an electrolyte having amic acid salts prepared in situ in the electrolyte by reacting a cyclic anhydride with ammonia or an amine in an aprotic solvent acting as an acceptor in hydrogen bonding and thereafter adding glycol.

Abstract: An aluminum electrolyte capacitor having a liquid operating electrolyte that contains combustible constituents is integrated in a housing. An absorbent mass that is pourable and only partially fills the empty volume of the housing is contained in the housing.

Abstract: An electrolytic capacitor having aluminum anode and cathode members separated by an insulating spacer impregnated with an electrolyte which is free of dibasic acids including citric acid. The electrolyte consists essentially of a solution of boric acid and an amine having a molecular weight of not greater than 175 in a mixture of a member of the group consisting of butzrolactone, dimethylacetamide and dimechylformamide and mixtures of dimethylacetamide and dimethylformamide in a major amount and a polyalkylene glycol having a molecular weight of not greater thann 2000 in a minor amount. The capacitor is adapted for use at a medium to high operating voltage and over a wide temperature range and to develop little or no gas even when operated at voltages above 200.

Abstract: An improved electrolytic capacitor is particularly useful for operation at voltages above 500 volts is produced by employing an electrolyte containing a straight chain saturated aliphatic dicarboxylic acid in which the carboxylic moieties are separated by at least 14 carbon atoms.

Abstract: A capacitor having a wound aluminum foil electrolytic capacitor section contains an electrolyte solution of 10 to 32 wt % diethylammonium fumarate, 10 to 30 wt % N-methylpyrrolidinone, 4 to 7 wt % water, 0.1 to 0.5 wt % ammonium dihydrogen phosphate, with the remainder ethylene glycol. The capacitor is capable of operation at temperatures up to 125.degree. C.