To protect people from the risk of injury, safety glass undergoes two processes: tempering and lamination. Through a tempering heat treatment, glass sheets acquire a resistance to mechanical and thermal stresses that are significantly higher than those of ordinary glass. If it breaks, it shatters into small fragments which are not very sharp.
Laminated safety glass is made up of two or more sheets sandwiched together with plastic film. If it breaks, the broken fragments stay glued to the film and are held in place.
By using a sandwich comprising interleaved glass and plastic layers of the right thicknesses, we can achieve glazing which is burglar-, vandalism-, bullet-, and explosion-proof.
The UNI 7697: 2015 Standard establishes the criteria for choosing the right glass to use in specific situations to ensure the minimum safety requirements for users.