External films are are of weather resistant construction having additional UV barriers to help protect the film from degrading through exposure to sunshine, and also having a strong waterproof adhesive. They are particularly used when inside access is not always possible or depending on the type of glass, in particular laminated, Georgian-wired, heavy tinted glass or some double or tripled glazing.
Opalux® silver reflective 20 solar control product can also provide additional benefits such as daytime one-way privacy, uniform outside appearance, winter heating savings, and as with most Opalux films up to 99% ultraviolet light (UV) filtering. (For specialist UV filtering in museums etc, see Specialist UV Control Film).
The films are applied externally and, in daytime, lend the glass a silver reflective outside appearance, whilst from the inside, the visual effect, much less noticeable, is a light tint.