- Mica, silvered mica, ceramic – low values, stable, suitable for HF
- Hi-k ceramic – relatively large capacitance in small size, not suitable for radio frequencies (RF)
- Very large capacitance require thin dielectrics formed chemically in electrolytic capacitors
- Electrolytic capacitors are polarised; must avoid reverse polarity or overvoltage
- Electrolyte can dry up over time causing failure