COMPARISON OF CHARACTERISTICS OF METALLIZED
DIELECTRIC FILMS USED IN CAPACITORS

CHARACTERISTICS	UNITS	Polyester	Polypropylene	Polystyrene	Polycarbonate
				film-foil only
				O B S O L E T E
CAPACITANCE VALUES:(min.)	F	0.0001	0.000047	0.00001	0.0001
TOLERANCES: (min.)	± %	2.5(2)	1.0 - 20.0	0.5	1.0 - 20.0
WORKING VOLTAGES: (min.)	Vdc/Vac	50/30	160/90 & up	33/25	40/25 &up
TEST VOLTS:	Rated Vdc X	1.6	1.6	2.0	1.6
OPERATING TEMPERATURE RANGE:(1)	° C	-55+125	-55 to + 105	-40+85	-55 to + 125
VOLTAGE DERATING	% V/1° C	1.5 (above 85 ° C)	1.5 (above 85 ° C)	1.5 (above 75 ° C)	1.25 (above 85 ° C)
DISSIPATION FACTOR: @ 1,000Hz (1)	%	0.8	0.05	0.05	0.2
INSULATION RESISTANCE: (min.)(1)	M-Mx	15,000-5000	100,000-30,000	100,000-30.000	30,000-10,000
TEMPERATURE COEFFICIENT: (1)	PPM/°C	+ (400 ± 200)	+ (200 ± 100)	-(100±50)	+ (120±60)
PULSE HANDLING: (minimum)	V/Sec	7.5	7.5	high(foil)	6.5
CAPACITANCE DRIFT: 2 years	%	3	2	0.5	3
SELF INDUCTANCE:	nH/1mm	1	1	1	1
DIELECTRIC ABSORPTION:	typ. %	0.5	0.05	0.03	0.2
VOLUMETRIC RATIO (0.1F 250V)	%	100	160	750 (3)	210
MEASURED TO STANDARDS		CECC & IEC	CECC & IEC	CECC & ICC	CECC & IEC

*Although volume is approximately the same for values @ voltages 160V & over, Polycarbonate was available for voltages as low as 40 V capacitors, were very small
1.) See graphs.
2.) Because of big changes of capacity with temperature closer tolerances, although possible, are not practical.
3.) Polystyrene was not available metallized therefore, comparison is with film- foil polyester.
All Values are approximate & depend upon manufacturing process used.

We continually improve our products and therefore reserve the rights to change the above specifications without notice.