1. Polyester film has high mechanical strength, easy film formation (the thinnest can reach 0.6μm), good tensile strength, high elasticity and good flexibility.

2. Good heat resistance, the maximum working temperature can reach 125℃. At high temperature, the film is still soft and not brittle at -60°C.

3. Larger dielectric constant;

4. Easy to metallize, high volume ratio, small capacitance.

Compared with other plastic films, the volume resistivity of polyester film is lower, and the loss tangent is also larger; when the operating temperature is higher than 100°C, its volume resistivity drops linearly, and the loss tangent value also increases rapidly, stabilizing Sex is not as good as CBB capacitors.

At present, the common CL capacitors mainly include CL21X ultra-small capacitors, polyester capacitors and correction capacitors. (The previously popular CL21 capacitors are basically replaced by CBB21/22 capacitors, and there are few users)