What are the dangers of inferior film capacitors

A film capacitor is a capacitor constructed by using metal foil as electrodes, overlapping it with a plastic film such as polyethylene, polypropylene, polystyrene, or polycarbonate from both ends, and then winding it into a cylindrical shape.

Theoretically, for film capacitors of the same model and size, production costs may differ, but the differences shouldn't be significant. So why are some manufacturers' film capacitors so much cheaper? The most likely reason is that they've used substandard materials and workmanship. What are the dangers of using inferior film capacitors?

Inferior film capacitors are cheap to produce but of poor quality, with low insulation resistance, high dielectric loss, and poor resistance to high temperatures and pressures. At high temperatures, their lifespan is shortened, they are easily damaged, and they are prone to malfunctions in electronic products. In severe cases, they can even explode and cause fires.

Due to limitations in raw materials and manufacturing processes, some inexperienced factories with inadequate equipment may introduce hidden problems into film capacitors. Issues such as dielectric damage, mechanical damage, and low cleanliness during production can lead to substandard film capacitors. These problems from manufacturers result in short lifespans and a tendency for the film capacitors to break down easily.

How can I avoid buying inferior film capacitors?

Avoid choosing film capacitors with neutral markings: Neutral markings refer to capacitors where the brand isn't even printed on the surface. These capacitors are often produced by small factories and mainly supplied to traders without their own factories. Many traders don't have their own brands and use extremely low prices to seize the market, so the proportion of inferior film capacitors with neutral markings is higher. It is recommended to buy branded film capacitors like those from Anhui Safe Electronics.

As long as you choose reputable, branded film capacitors, their quality will be up to standard, and they will have a long lifespan and excellent stability.