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Bent Tempered Glass

Home > Architectural Products > Bent Tempered Glass

Bent Tempered Glass

Flat glass is heated until red hot, carefully formed to the desired shape, then tempered by super cooling to trap high energy within the glass. The resulting bent tempered glass has up to a fourfold strength increase compared to annealed glass of the same thickness and if broken, breaks into an innumerable number of relatively small fragments of more or less cubicle shape.

This product begins as flat glass commonly selected from the broad range of commercial float products including clear, ultra clarity low-iron, grays, bronzes, greens, and blues. The surface may have a reflective, or other pyrolitic coating. The flat pieces are CNC processed and then undergo the complex processes to create bent tempered glass2.

We offer bent tempered glass in 5 mm to 19mm thickness. The bent tempered glass possible includes that within the broad range of sizes and radii referenced in the capabilities table.

Capability Table

AIS Stronglas Cylindrical Bend Tempered
Thickness (mm)	Max Arc length (mm)	Min Arc length (mm)	Min Radius (r) (mm)	Max straight length (mm)	Remarks
5 mm	1950	500	800	2800	Arc length is lesser of quarter circle (2pir/4), or 1950mm
6 mm	1950	500	800	2800	Arc length is lesser of quarter circle (2pir/4), or 1950mm
8 mm	1950	500	800	2800	Arc length is lesser of quarter circle (2pir/4), or 1950mm
10 mm	1950	600	1000	2800	Arc length is lesser of quarter circle (2pir/4), or 1950mm
12mm	1950	600	1000	2800	Arc length is lesser of quarter circle (2pir/4), or 1950mm
15 mm	1950	800	1500	2800
19 mm	1950	800	1500	2800

Flat Tempered Glass

First the sheet is cut to size and then are fed by conveyor into a furnace where they oscillate back and forth on ceramic rollers until they reach a temperature of approximately 620oC and a semi-plastic state.

Under computer control, the glass moves into the quench where it is rapidly cooled by high pressure cool air. This 'snap cooling' or quenching induces comprehensive stresses to the glass surface, while the center remains in tension. Although the physical characteristics remain unchanged, the additional stresses created within the glass increases its strength by 4-5 times compared to that of annealed glass of equal thickness.

When broken by impact, fully tempered glass immediately disintegrates into relatively small pieces thereby greatly reducing the likelihood of serious cutting or piercing injuries in comparison with ordinary annealed glass.

Laminated Glass

Laminated glass is a sandwich made of one piece of plastic Poly Vinyl Butyral between two or more glasses. The PVB sticks with the glass, forms chemical as well as mechanical bonds. When laminated with annealed glass, the layer maintains the geometric integrity of the pane in case of breakage. Also it gives acoustic insulation as well as gives protection against damage caused due to UV radiation because it cuts almost 99% of UV radiation present in the sunlight. A Laminated glass is regarded as a safety glass by most of the standards.

The PVB is always in the thickness of .38 mm And/or the multiple of .38 mm. So the basic no--menclature of laminated glass is XY.Z where X & Y are the thickness of the 2 panes of glass z is the thickness of the PVB.

Laminated Glass offers many benefits and few of them are Safety, Security, Acoustic Control, Solar Energy Control, UV control, Durability and Low visual distortion.

Insulating Glass Unit

IGU are basically multiple layered glass panes that have very dry air or inert gas between the glass panes. The glass panes are hermitically sealed.

As very dry air is a poor conductor of thermal heat and an IGU provides excellent thermal insulation. A typical 6mm clear + 12 mm air gap + 6 mm clear IGU has a U-value of 2.8 Watts/m2 0 C often significantly lower than many low e glasses. Contrary to popular opinion IGUs do not provide good acoustic insulation.

The various components that goes into making of IGUs are:-

Spacers which is usually made of Aluminum , acts as an housing for desiccants and keeps the 2 panes of glass separated.
Desiccants also known as drying agent performs most important function of absorption humidity inside IGU.
Primary seal mainly butyl sealant acts as a main seal between glass and aluminum spacer.
Secondary seal can be Silicon or poly sulphide and provides structural integrity to the unit.
Air Gap that is gap between the two glass can be filled with dry air, inert gas like argon but never vacuum.

Solar & Heat control

The heat gain in a building is either from the direct solar energy and/or from non solar heat. Direct solar heat comes from visible and non visible light, the impact areas are West and South facing facades.When the sun energy falls on the facade three things happen some of the energy is reflected, some of it absorbed and some of it is transmitted.

Non Solar Heat gain/loss is mainly due to conduction i.e.the heat transfer through the material( glass in this matter), convection i.e. temperature difference between inside and outside) and long wave infra red radiation i.e. sun gives us energy in the form of short wave infrared and then subsequently reradiated as long wave infrared.

Sound Control

Sound is an important issue and is critical part in the design and function of a facade

Noise is simply unwanted sound that is transmitted by vibration through air , walls, floors and ceilings. Sound pressure is measured in decibels(db) and has a logarithmic scale. The sound transmission loss (STL) , measured in db, is the most common measure by which acoustical performance is rated. It is a weighted average over the frequency range of 100 Hz to 5000 Hz. The higher the STL the better the ability of material to resist the Sound transmission.

Another thing that is important when deciding the acoustic insulation is the sound source because each source vary in the range of wavelength both high frequency as well as low frequency . Different types of glass monolithic, igu and laminated glass provides different sound insulation depending upon thickness and configuration.

Thermal Breakage

In cool weather and in the absence of solar radiation, both edge and center, is relatively cool. When this cool pane is suddenly subjected to solar radiation, the temperature of the center portion of the pane is raised by the absorbed radiation but the edge, being shaded from direct radiation, experiences a much smaller temperature rise. This differential in the rate of heating of the edge and center of the pane results in a temperature difference and produces thermal stress.

The primary factors affecting the magnitude of the thermal stress in the pane are its absorptiveness, reflectance of the pane.This phenomenon does not present a problem if the increase in the temperature is uniform on all glazing.
The thermal breakage always starts at the edge of the glass, perpendicular to the edge and the two faces.

The breakage can be single or multiple depending upon the severity of the thermal stress.

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