The choice of dielectric is largely determined by the temperature stability required:
Ultra stable Class I dielectric, with predictable change of electrical properties on temperature, voltage, frequency and time. Used in circuits requiring stable performance.
Stable Class II dielectric, with predictable change of properties with temperature, voltage, frequency and time. Used as blocking, coupling, by-passing and frequency discriminating elements. This dielectric is ferroelectric and offers higher capacitance ranges than class I.
General purpose Class II dielectric with highest dielectric constant and greater variation of properties with temperature and test conditions. Very high capacitance per unit volume and suited for application as well as filtering, transient suppression blocking, and charge storage application.
Capacitance Range: 0R5 - 104
Temperature Coefficient: 0+-30PPm/'C; C<=10nF R>=10000MQ
0+-60PPm/'C. (-55'C to +125'C)
Insulation Resistance: C<=10nF R>=10000MQC>=10nF C. R>=100S
With Standing Voltage: 2.5 times of working voltage
Dissipation Factor: 0.15%max(20'C, 1MHz, 1VDC)
Rated Voltage: 25, 50, 63, 100VDC
Capacitance Tolerance: B=+-0.1PF C=+-0.25PF D=+-0.5PF
F=+-1%G=+-2% J=+-5%K=+-10% M=+-20%
Life Test: 200% rated voltage at +125'C 1000h
Solderability: SJ/10211-91 4.11
Resistance to Soldering Heat: SJ/T10211-91 4.10
Mechanical Test: SJ/ T10211-91 4.9
Temperature Cycling: SJ/ T10211-91 4.12
Moisture Resistance: SJ/ T10211-91 4.14
Termination Adhesion Strength: SJ/ T10211-91 4.9
More details pls ask for datasheets!