Why are there difference in thicknesses of Safety film?
Not all safety window films are created equal. If you intend on having the film installed outdoors, make sure that the safety film is at least 7-MIL (175 Microns) in thickness. This is the industry tested gauge that can successfully stand up to diamond-tipped glass etching tools.
Lighter gauge safety films (like 4-MIL) are meant to only hold up against attacks by the casual tagger, who would most likely be using a key or coin to scratch the glass. 4-MIL films are most successful when used on Aluminum fabrication panels in public areas or on bathroom mirrors inside retail establishments.
The reason lighter gauge films are manufactured is because they use less material and are therefore cheaper to make.
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