If the viscosity of Pet protective film changes, it is generally caused by environmental factors. Different temperatures and humidity have a certain impact on the viscosity of the protective film. When the temperature is high, the molecules in the glue are more active, and the viscosity will be slightly higher. When the temperature is low, the molecular activity in the glue decreases, and the viscosity will be slightly lower; Another situation is that the humidity in the air is too high, causing water molecules in the air to run to the adhesive surface, which may also affect the adhesion of the protective film. So our protective film is generally required to be stored in a suitable and relatively dry place at a suitable temperature to avoid any changes in viscosity.