Heat-strengthened glass is twice as strong as annealed glass of the same thickness, size and type. If broken, heat-strengthened glass will break into large shards similar to annealed glass. Because of this, the tendency for the glass to vacate the opening is reduced.
The surface compression of heat-strengthened glass with thicknesses of 1/4″ (6mm) and less is 4,000 – 7,000 psi. Surface compression for 5/16″ (8mm) and 3/8″ (10mm) heat-strengthened glass is 5,000 – 8,000 psi. (Because of reader repeatability and instrument tolerances, Viracon’s tolerance for heat-strengthened glass surface compression is +/- 1,000 psi.)
While improving the strength and resistance to thermal shock and stress, heat-strengthened glass does not meet safety glazing requirements as outlined by the American National Standards Institute (ANSI) Z97.1 or the federal safety standard Consumer Products Safety Commission (CPSC) 16 CFR 1201, and therefore should not be used in these situations.
Double insulating glass is highly effective in reducing heat and stopping unwanted sound transmission. It can help to reduce the level of noise and energy consumption in common you can have a Low-E Clear Glass 6+6+6, which is 6mm glass.
In this, you can choose
Annealed Glass: either one or both
Tempered Glass: either on or both recommended both tempered
Laminated Glass:either one or both recommended at least one laminated
Clear Glass:either one or both
Reflected or Coated Glass:
Recommeneded one refelected or coated preferably outside glass and on surfce two (mirror surface)
In Laminated glasses you can use annealed or tempered but more recommended is tempered, for annealed glasses you can laminate with a single layer of PVB (polyvinylbutral) of 0.38mm. thickness and it comes only in one thickness if needed more one of the main purpose of using laminated Glass to prevent furniture or other things from Ultraviolet rays of sun and it is much effective in blocking UV up to 98%. to laminating tempered glasses you must use at least 0.76mm (two layers) but generally used is 1.14 or 1.52 mm thicknesses.
More layers makes more stronger and durable you have choice of number of different colors in PVB sheets transparent, white, blue, green and bronze etc.,
The Bullet resisting glasses made by laminating alternating layers of glass and PVB interlayer to form a single multiple-ply glass laminate. This combination works because the glass layers smash and flatter the bullet, absorbing the shock of impact. The interlayer holds the glass together keeping the glazing unit integral to some extent absorbing the impact energy. The minimum thickness of Bullet resisting glass is 25mm in which you can have 12mm+PVB+12mm or 8mm+pvb+8mm+pvb+8mm shown in the diagram below. The more layers makes stronger and the maximum thickness you can have up to 65mm.
Glasses can be tempered from 4mm to 19 mm thickness. Tempered is done in furnace at a temperature of 680 deg. It makes 1-4 times stronger & strengthens.
After tempering glass become more durable and safe. When broken, it shatters into many small fragments which prevent major injuries. This type of glass is intended for facades, sliding doors, building entrances, bath and shower enclosures and other uses requiring superior strength and safety properties.