Not all films are suitable for all glass. The absorptance of the glass and the film, the size of the pane, the thickness of the glass, the construction of the window should be considered in terms of single pane, insulated glass, treated (with a low-emissivity coating), laminated or toughened.
Advice on the appropriate selection of film for the glass is vital to ensure that the glass does not crack as a result of thermal stress. However, it is possible that a pane of glass may break subsequent to the application of an appropriate film, because the pane has been damaged during the glazing of the window, or as a result of movement of the building or other physical stresses that are not apparent at the time of the application of the film.
Glass may crack subsequent to the application of sign writing or if heavy, thermally efficient drapes are hung close to the glass, particularly if the edges of the glass are damaged.
The chances of glass breakage occurring subsequent to the application of film or sign writing or the hanging of drapes, are very small. However breakage can occur and it is impossible to predict the edge condition of the glass without removing it from the frame – an approach that is not practical.