CBB film capacitor aging is mainly manifested as capacitance attenuation, dissipation factor rise and insulation resistance drop. Polypropylene film itself has good anti-aging performance, but improper electrical stress, high temperature and humid environment will greatly accelerate aging progress and shorten service life.

CBB capacitor aging causes: Long-term operation with overvoltage or excessive ripple current will cause repeated self-healing and loss of metallized layer. Continuous high ambient temperature will accelerate the degradation of dielectric film. Poor sealing leads to moisture intrusion, which causes electrochemical corrosion of metal coating. Mechanical damage and excessive thermal stress during welding will also induce premature aging.

CBB capacitor storage and usage guide: Store in cool, dry and ventilated environment, avoid direct sunlight and high humidity. Recommended storage temperature is 5℃ ~ 35℃, humidity below 75%. During application, reserve voltage and ripple current margin. Avoid concentrated heat around the capacitor on PCB. Do not use it beyond the rated frequency and current range.

weidy film capacitor suggests that the shelf life of CBB capacitors under standard storage conditions is 2 years. If stored for a long time, it is better to retest capacitance and withstand voltage before use. For circuits with high reliability requirements, regular sampling aging test is recommended to track the parameter change trend of the batch.