Types of Capacitors

Capacitor style	Dielectric	Relative Permittivity at 1 kHz	Maximum/realized. dielectric strength V/µm	Minimum thickness of the dielectric µm
Ceramic capacitors, Class 1	paraelectric	12–40	< 100(?)	1
Ceramic capacitors, Class 2	ferroelectric	200–14,000	< 35	0.5
Film capacitors	Polypropylene ( PP)	2.2	650/450	1.9 – 3.0
Film capacitors	Polyethylen terephthalate, Polyester (PET)	3.3	580/280	0.7–0.9
Film capacitors	Polyphenylene sulfide (PPS)	3.0	470/220	1.2
Film capacitors	Polyethylene naphthalate (PEN)	3.0	500/300	0.9–1.4
Film capacitors	Polytetrafluoroethylene (PTFE)	2.0	450(?)/250	5.5
Paper capacitors	Paper	3.5–5.5	60	5–10
Aluminum electrolytic capacitors	Aluminium oxide Al2O3	9,6[9]	710	< 0.01 (6.3 V) < 0.8 (450 V)
Tantalum electrolytic capacitors	Tantalum pentoxide Ta2O5	26[9]	625	< 0.01 (6.3 V) < 0.08 (40 V)
Niobium electrolytic capacitors	Niobium pentoxide, Nb2O5	42	455	< 0.01 (6.3 V) < 0.10 (40 V)
Supercapacitors Double-layer capacitors	Helmholtz double-layer	-	5000	< 0.001 (2.7 V)
Vacuum capacitors	Vacuum	1	40	-
Air gap capacitors	Air	1	3.3	-
Glass capacitors	Glass	5–10	450	-
Mica capacitors	Mica	5–8	118	4–50