1. Temperature resistance: High temperature resistant PET protective film should be able to maintain stable performance in high temperature environment. Generally speaking, the high-temperature resistant PET protective film should be able to withstand high temperatures above 100 degree without blistering and falling off on the surface of the film.

2. Gloss resistance: A high-quality high-temperature resistant PET protective film can maintain a beautiful appearance gloss in a high-temperature environment without causing discoloration and yellowing of the film surface.

3. Bending resistance: The bending resistance of the high temperature resistant PET protective film should reach a certain standard, so as to ensure the good use effect of the film in high temperature environment.

4. Adhesion: High-quality high-temperature-resistant PET protective film should have good adhesion and will not lose its adhesion under high temperature or strong light radiation, so as to protect the protected object from damage.

To sum up, the standard for judging high temperature resistant PET protective film is to look at its performance in high temperature environment, and also consider its bending degree, gloss and adhesion. Only with these requirements can it be judged as a high-quality high-temperature resistant PET protective film that meets the standards.