The plastic film capacitor varies in the maximum applicable voltage depending on the applied voltage waveform, current waveform, frequency, ambient temperature ( capacitor surface temperature ) , capacitance value, etc. Before use, please check whether the voltage waveform, current waveform and frequency at both ends of the capacitor (in high frequency applications, the allowable voltage varies with the type of capacitor, please refer to the instruction manual for details) whether it is within the rated value.

The pulse ( or AC ) current flowing through the capacitor is expressed as: I=C× dv / dt.Due to the fact that dissipation factor will generate the internal heat under the application of high frequency or high pulse current, temperature rise in it will occur and may cause deterioration of with standing voltage,even lead to break down (
smoking or firing ) .Therefore, the safety use of capacitor must be within the rated voltage ( or category voltage ) and the permissible current.The operating current must be considered by dividing into pulse current ( peak current ) and continuous current ( rms current) depending on the break down mode ,and when using,should make sure the both currents are within the permissible values.

When continuing current flows through the capacitor,the temperature inside the capacitor will rise, induced by accumulated heat. If the temperature exceeds allowed hot-spot temperature, it might cause a short circuit or fire. Therefore, the current flowing through the capacitor must not exceed the maximum value specified in the catalog, and it is necessary to monitor the temperature rise of the capacitor when it is loaded.

Because the charging and discharging current of capacitor is obtained by the product of voltage rise rate ( dv/ dt ) and capacitance, low voltage charging and discharging may also cause deterioration of capacitor such as shorting and open due to sudden
charging and discharging current. When charging and discharging, pass through a resistance of 20Ω /V or more to limit current.When connecting multiple film capacitors in parallel in withstand voltage test or life test, connect a resistance of 20Ω/V to 1000Ω / V or more in series to each capacitor. ( For detail see the specification ) In additional, capacitors must be discharged with resistor before handling. Because the capacitor hasn't discharge resistor inside, so there is residual but maybe deathful electric energy contained.

Any buzzing noise produced by capacitor is caused by the vibration of the film due to coulomb force that is generated between the electrodes with opposite poles. Of the waveform with a high distortion rate or frequency is applied across the capacitor, the buzzing noise will become louder.But the buzzing noise is of no damage to capacitor.

Although flame retardation epoxy resin or plastic case is used in the coating or encapsulating of plastic film capacitor, continuous outer high temperature for firing will break the coating layer or plastic case of the capacitor, and may lead to melting and firing of the capacitor element.

If used for long time in a humid ambient, the capacitor might absorb humidity and oxidise the electrodes causing breakage of the capacitor. lf case of Application, high humidity would increase the corona effect.This phenomenon causes a drop of capacitance and an increase of capacitor losses.

I.Capacitors may not be stored in corrosive atmospheres,particularly not when chlorides, sulfides, acids, lye, salts, organic solvents or similar substances are present. 2. lt shouldn't be located in parcicularly high temperature and high humidity, it must submit to the following conditions ( unchanging primal package ) : Temperature:≤35℃ Humidity: ≤80% RH,no dew allowed on the capacitor. Storage time:≤24 months ( from the date marked on the capacitor's body or the label glued to the package )