Heat resistance window film main functions include:

1. Heat insulation: Heat resistance films are engineered to block and resist high levels of heat. They have a higher tolerance to heat exposure, preventing heat from passing through the window and into the interior space.

2. Heat reduction: Similar to solar control films, heat resistance films help to reduce solar heat gain and maintain a cooler indoor environment.

3. Thermal stress resistance: Heat resistance window films have a higher melting point and can withstand thermal stress caused by sudden temperature changes, preventing cracking or breaking of the glass.

4.Safety and security: Some heat resistance films also offer enhanced safety features, such as shatter resistance, in case of accidents or break-ins.