Safety film is polyester sheet with thickness starting from four millimeters (1 Mil = 1 : 1000 inches) and usually transparent
The major purpose is to provide safety for the people inside and to prevent invaders to some extent.
For example, if the film is stuck inside, the mirror will not drop down in case of being hit by hammer because the film will fix the mirror and disperse impact throughout the mirror sheet. It means that any material hitting the mirror will not be able to penetrate the mirror with film. Meanwhile, safety film has more glue compared with normal filter film in order to fix with the mirror surface.
The major properties of safety filter film are similar to the one of safety film but it can filter the light and reduce the heat as much as 64%.   
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