TOUGHENED GLASS
This is achieved by heating annealed glass to approx 620°C within a furnace at which point it begins to soften. This is then cooled rapidly when broken. Toughened glass fractures into small pieces (called dice). As these particles do not have sharp edges and dagger points of normal broken glass, it is generally regarded as safety glass. Toughened glass must be cut to a size and have any other processes (drilling polishing etc.) completed before toughening, because attempts to "work" the glass after will cause it to shatter.
LAMINATED GLASS
Laminated glass is manufactured by assembling two panels of glass which are sandwiched together with PVB. This is a composite high-performance product which combines the material properties of the glass with the unique properties of PVB such as adhesion, elasticity and impact resistance. When broken, it remains integral due to the plastic interlayer, remaining safe even when shattered. Although it breaks easier than toughened glass, it has a better security aspect as a much greater force is needed to break the plastic.
MIRRORS
Mirrors are commonly made of glass with a smooth, polished surface that forms images by reflecting light. They are exceptionally useful devices used in every area of daily life. The original method of making mirrors consists of depositing a coating of metal, mostly silver, on the surface of glass. A layer of copper, protected by a painted backing, usually protects this deposit. The silver gives the mirror its reflective properties.