Electrolytic capacitors are one of the indispensable components in electrical products. Aluminum electrolytic capacitors have developed rapidly due to their excellent performance, low price, and wide range of uses. Aluminum foil for electrolytic vessels is mainly 3003 aluminum foil, 1100 aluminum foil, 1070 aluminum foil, etc.
Capacitor foils undergo treatments such as anodizing and anodizing to increase their dielectric constant and dielectric strength to meet the needs of the capacitor. Widely used in electronic circuits and power systems.
Capacitor aluminum foil technical requirements
| electrolytic capacitor foil | ||||
| Size deviation | ||||
| Thickness | Thickness tolerance | Width tolerance | Split level | Tower shape |
| 0.015-0.050 | ±5% T | ±1.0(When the width is <500mm,±) | ≤1 | ≤2 |
| ＞0.050-0.150 | ±5% T | |||
| Mechanical ability | ||||
| Alloy | Temper | Thickness/mm | Tensile strength Rm/MPA | Elongation after break % |
| 1A90 | O | 0.015-0.08 | 30-60 | ≥10 |
| H22 | 0.015-0.08 | 60-90 | ≥1 | |
| H18 | 0.015-0.08 | ≥150 | - | |
| 1070A | H18 | 0.015-0.08 | ≥150 | - |
| 3003 | H18 | 0.015-0.08 | ≥185 | - |
| Corrosion rate | The corrosion rate of low-voltage anode foil in status H18 is not greater than 0.8% | |||
| cubic texture | ||||
| Product Category | Alloy | Temper | Thickness/mm | Cubic texture content/% |
| Medium and high voltage anode foil | 1A97,1A99 | O | >0.085~0.100 | ≥90 |
| >0.100~0.150 | ≥95 | |||
| Connector | ||||
| cathode foil | There should be no more than one joint per roll. The joints should be firm and flat, and the joints should be clearly marked. | |||
| anode foil | No joints allowed | |||
Appearance quality requirements of aluminum foil for capacitors
1. The surface of the aluminum foil should be clean and smooth, and no corrosion, cracks, waves, wrinkles, visible oil marks, oil spots, pollutants, impurities and other defects are allowed.
2. The surface of the aluminum foil is allowed to have slight bright spots and color differences that do not cause surface damage.
3. The end surface should be clean, and no defects such as burrs, bumps, scratches, etc. are allowed.