Glass Types 
In general most homes have glass fitted which is suitable for almost any type of tinted film. Offices, factories and shopfronts can be quite different. There are numerous different types of glass, however for the exercise we will keep it simple.
Offices, Factories and Shop Fronts
Glass in Offices, Factories and Shop fronts is often Laminated or Toughened and even factory tinted.  Toughened glass is generally marked in one corner and can be safely tinted with any type of film even if it is factory tinted.   Laminated glass in these areas is a different story! 
Often shop fronts and large glass panes are 8 to 10 mm thick and breakage will occur if tinted internally. DO NOT ATTEMPT TO TINT THESE PANES AS BREAKAGE WILL OCCUR! (NOTE; The only film which can be safely applied to this type of glass by a DIY Tinter is ?WHITE FROST?) We suggest you email us or contact your local professional tinting outlet if you are considering to tint these types of glass.
Float glass
When broken , large dangerous shards occur - common in most windows around the home - can be tinted with most films if the window pane size is less than 3 square meters.  When tapped with a coin this glass gives a rather high pitched sound.
Toughened glass
When broken shatters into very small like size fragments.  Usually used in doors and possibly some windows.  This glass is usually marked in one corner with a logo including the word ?toughened? and is suitable for application of any type of tinted film.
Laminated glass
When broken, cracks and remains in place. Usually used in doors, adjacent glass areas and in very large windows. This glass consists of two layers of glass laminated together and when tapped with a coin gives a rather dull pitched sound. 6 mil laminated glass up to a size of less than 3 square meters is suitable for application of reflective or lighter types of tinted films.
Dark films should be avoided as these can over-stress the glass and cause ?thermal breakage?, particularly on East facing panes on cold winter mornings.