Toughened Glass

Toughened Glass

Toughened Glass:

Toughened glass or tempered glass is glass that has undergone processes of controlled thermal treatment to increase its strength. It is four times stronger than normal annealed glass. Toughened glass is made from annealed glass that has been heated to approximately 650⁰C and then rapidly cooled. Due to the increased heat treatment and rapid cooling of the glass, the treatment produces different physical properties. This results in compressive stress on the surface and improved bending strength of glass. Before toughening, the glass must be cut to size or pressed to shape.

Characteristics of Toughened Glass:

Toughening does not alter the basic characteristics of glass like light transmission and solar radiant heat properties of normal glass. It can neither be cut, nor altered. Toughened glass is known to have higher thermal strength, with the ability to withstand high temperature changes up to 250°C. A safety glass, toughened glass is difficult to break but in the event of a breakage, disintegrates into small globules . However, it is prone to very rare spontaneous breakage, a condition that occurs when the repeated heating and cooling cause the nickel sulfide stones to increase in size.

Annealed Glass vs Toughened Glass:

 
Parameters
Toughened Glass
Annealed Glass
Heating Temperature Heated to over 1,100 °F
Heated between 850 °F and 900 °F
Strength
Known for its strength and durability. Four times stronger than annealed glass
Brittle and lacks endurance
Breakage Pattern
Does not break easily; In the rare event of breakage, shatters into small, pebble-like pieces
Breaks under pressure; Breakage results in dangerous, jagged edges
Safety
Offers greater safety due to its resilience
Relatively unsafe due to its delicate nature
Flexibility
Can’t be altered after tempering
Can be cut, drilled, or polished
Application area
Appropriate for high-traffic areas
Inappropriate for high-traffic areas
Distortion Type
Bow & Warp Distortion Can Occur
Free from Bow, Wave or Warp Distortion

 

The Process of Toughening:

First, the glass is carried by rollers and goes through the furnace. Here, three types of modes are used to heat the glass, viz., conduction, convection and radiation. While the rollers help to conduct the heat, the coils enable radiation of heat. This ensures that the glass is evenly heated on every side. By blasting air on both the surfaces, the heated glass is then cooled uniformly.

Why the Need for Toughened Glass:

Toughened Glass has high withstanding capacity and is therefore suitable for uses where strength and thermal resistance are crucial. It is nearly four to five times stronger than annealed glass, and thrice as strong as heat strengthened glass. Even during breakage, its relatively small pieces reduce the chances of injury. Toughened Glass is ideal in spider and point fixed glazing owing to its high edge strength tempered glass. Glass is susceptible to thermal breakage with drastic changes in temperature. This is more so when temperature rises above 32°C, building up stress within the glass. But with toughened glass, there is significantly higher edge strength to resist thermal breakage.

What makes Toughened Glass ideal for homes:

Toughened Glass is the ideal solution for every space that demands the highest level of safety, and hence perfect for homes. It is preferred because of the protection it offers, be it for the elderly or children, creating a safety blanket unlike normal annealed glass. What makes toughened glass the go-to choice is the sturdiness it ensures, and its capacity to not break under pressure; even if it does break, which is extremely rare, the pieces are not sharp or jagged that tend to cause serious injury. It can also be made acoustic, allowing privacy and peace in the living space. Functional advantages aside, toughened glass is also an interior designer's delight as it enables one to add to the aesthetic value with its myriad styles.

Applications of Toughened Glass:

Toughened Glass is perfect for places that are prone to breakage and need glass that is tough. In buildings, it is suitable for both indoor and outdoor use, especially in sloped glazing, facades, shower cabins, doors, partitions, etc. It is also widely used in the manufacture of appliances like ovens, refrigerators, shelves and fireplace screens. In the automotive industry, it is used in the rear windows of vehicles.

 

Windows

Windows

Facades

Facade

 

Doors

Door

Partitions

Partition

 

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