Use proper soldering techniques. If the soldering iron is placed too close to the capacitor's body or the soldering temperature is too high, you may damage the electrical insulation or alter the cap's characteristics. In dip or wave soldering , leads should be dipped in solder of 260 degrees F or less for three seconds or less. Use the proper solvent. Halogenated hydrocarbon cleaning solvents can contaminate capacitors.
Chlorinated solvents can damage the insulation or the seals.
Do not short the leads to discharge a capacitor without current limiting. Without current limiting, discharging a capacitor into itself will result in very high currents. MultiCaps TM appear, when discharged, as a dead short-circuit and have too little ESR to limit charging inrush current. Keep lead lengths as short as possible for good high-frequency performance.