Power and AC Film Capacitors
Printed Circuit Board Mount Power Film Capacitors – C4G Series, Axial Round, 250 – 850 VDC/160 – 450 VAC
Materials & Environment
The selection of materials used by KEMET for the production of capacitors is the result of extensive experience and constant attention
to environmental protection. KEMET selects its suppliers according to ISO 9001 standards and carries out statistical analysis on the
materials purchased before acceptance. All materials are, to the company's present knowledge, non-toxic and free from Cadmium,
Mercury, Chrome and compounds, PCB (Polychlorine Triphenyl), Bromide and Chlorine Dioxins Bromurate Clorurate, CFC and HCFC
and Asbestos.
Green Products
All KEMET power film products are ROHS Compliant.
Insulation Resistance
When the capacitor temperature increases, the insulation resistance decreases. This is due to increased electron activity. Low
insulation resistance can also be the result of moisture trapped in the windings, caused by a prolonged exposure to excessive
humidity.
Dissipation Factor
Dissipation factor is a complex function involved with the inefficiency of the capacitor. The tgδ may change up and down with increased
temperature. For more information, please refer to Performance Characteristics.
Sealing
Hermetically Sealed Capacitors
When the temperature increases, the pressure inside the capacitor increases. If the internal pressure is high enough, it can cause a
breach in the capacitor which can result in leakage, impregnation, filling fluid or moisture susceptibility.
Resin Encased/Wrap & Fill Capacitors
The resin seals on resin encased and wrap and fill capacitors will withstand short-term exposure to high humidity environments without
degradation. Resins and plastic tapes will form a pseudo-impervious barrier to humidity and chemicals. These case materials are
somewhat porous and through osmosis can cause contaminants to enter the capacitor. The second area of contaminated absorption
is the lead-wire/resin interface. Since resins cannot bond 100% to tinned wires, there can be a path formed up to the lead wire into the
capacitor section. Aqueous cleaning of circuit boards can aggravate this condition.
Barometric Pressure
The altitude at which hermetically sealed capacitors are operated controls the voltage rating of the capacitor. As the barometric
pressure decreases, the susceptibility to terminal arc-over increases. Non-hermetic capacitors can be affected by internal stresses due
to pressure changes. This can be in the form of capacitance changes or dielectric arc-over as well as low insulation resistance. Heat
transfer can also be affected by altitude operation. Heat generated in operation cannot be dissipated properly and can result in high RI2
losses and eventual failure.
Radiation
Radiation capabilities of capacitors must be taken into consideration. Electrical degradation in the form of dielectric embitterment can
take place causing shorts or opens.
© KEMET Electronics Corporation • P.O. Box 5928 • Greenville, SC 29606 (864) 963-6300 • www.kemet.com
F3040_C4G_AXIAL • 4/20/2016
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