Films are generally categorized into PO film, PE film, PEP film, etc. The most commonly used are PO and PEP films. PO film is classified by the number of threads—the fewer the threads, the shorter the warranty period.

The warranty period for PO film is much shorter than that of PEP film. If there is no professional film installation team and the lighting requirements are not particularly high, it is recommended to use PEP film. Generally, the service life of PEP film is twice that of PO film. Replacing the film can be costly and troublesome, so choosing a film with a longer warranty period is more appropriate.