20 SEP 1956 Measurement | High-Quality Aluminum Polymer Capacitor with 56 microfarads and 20V Tolerance The part number is CAP ALUM POLY 56UF 20 20V T/H - 56 ÂµF 20 V. These capacitors are made from aluminum polymer materials, offering radial and can types with a high temperature rating of 105Â°C for up to 3000 hours.