In the early days, endoscopes were used in the medical field. In order to provide corresponding protection for endoscopes and prevent them from being damaged, most endoscope protective films are based on the strong hardness of sapphire. It is made of sapphire technology, which can prevent collision and friction damage to the endoscope structure during the process of peering into the mechanical mechanism.

Sapphire is widely used in endoscope protective films due to its high performance, providing protection based on its hard nature. High temperature has no effect on sapphire, and chemical substances cannot corrode it. Narrow spaces will not be damaged by collisions or friction. It can be said that this protective film can easily record the internal situation of the equipment and search for repair and maintenance parts.