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Electrolytic capacitor paper (also known as electrolytic paper) is one of the three key materials that constitute aluminum electrolytic capacitors. As the adsorption carrier of the electrolyte, it forms the cathode of the aluminum electrolytic capacitor together with the electrolyte, and at the same time plays the role of isolating the two-pole foil, also known as the isolation paper. According to the voltage intensity of electrolytic capacitor paper, it can be divided into two categories: medium and high voltage electrolytic capacitor paper and low voltage electrolytic capacitor paper.

1.Medium and high voltage electrolytic capacitor paper

Medium and high voltage electrolytic capacitors mainly include capacitors for switching power supplies, energy storage charge and discharge capacitors, AC motor starting capacitors and flash capacitors, etc. With the development of the electronics industry, the application fields of medium and high voltage electrolytic capacitors are also constantly expanding. Medium and high voltage electrolytic capacitor paper refers to products with a withstand voltage of more than 160V. On the one hand, it requires the paper to have high withstand voltage strength and aluminum foil burr resistance. The performance of the paper is that it should have a higher tightness. It is required to have better absorption performance in order to improve its electrical performance. The performance of the paper is that it should have a lower tightness. Therefore, from the performance of the paper, the requirements of the pressure-resistant paper are contradictory, and it is difficult to form a single layer. solved on paper. Therefore, electrolytic capacitor paper companies generally use the method of double-layer and double-density to solve this contradiction, that is, the high-tightness layer is used to achieve higher voltage resistance and aluminum foil burr resistance, and the low-tightness layer is used to achieve better absorption performance. . However, due to the technical difficulty and high production cost of double-layer double-density paper, many manufacturers can only make single-density paper, that is, single-layer paper.

2. Low-voltage electrolytic capacitor paper

Low-voltage electrolytic capacitors are mainly filter capacitors, high-quality audio capacitors, bipolar capacitors, low-impedance capacitors, etc., and the development is slower than that of medium and high-voltage electrolytic capacitors.