Tempered (Toughened) & Heat Strengthened Glass


Tempered Glass is one of two kinds of safetyglass regularly used in applications in which standard glass could pose a potential danger.

Tempered glass is four to five times stronger than standard glass and does not break into sharp shards when it fails.

Tempered glass is manufactured through a process of extreme heating and rapid cooling, making it harder than normal glass.

Up to four to five times stronger than annealed glass of equal thickness

Higher resistance to thermal stress than annealed and heat-strengthened glass

When broken, breaks into numerous small pieces

Meets safety glazing requirements

Specifications:

Maximum dimension: 2440 x 6000

Minimum dimension: 200 x 300

Thickness (mm): 4 - 22

Heat Soak Test

There have been reported cases of spontaneous breakage of fully tempered glass. Although this is a rare phenomenon, many architects and contractors have become increasingly wary of this. Experts have determined that microscopic traces of Nickel Sulfide (NiS) inclusions within the glass is the reason for this spontaneous breakage.

The heat soak test or heat soak process is used to minimise the risk of spontaneous breakages of heat-treated glass caused by NiS inclusions. In this process, glass panels are placed inside a chamber and subjected to an oven temperature of 290ºC to accelerate nickel sulphide expansion.

This causes glasses containing nickel sulphide inclusions to break in the heat soak chamber, thus reducing the risk of potential field breakages. The broken glass can then be recycled and re-manufactured.

Two tests options are possible: statistical and full.

The statistical heat soaking process involves a specific number of glasses from a statistically selected order.

NiS breakage in this process does not exceed 0,1%, with a probability of 95%. On the other hand the full heat soak process involves testing all glass in the order, virtually eliminating any chance of NiS breakage.

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Specifications

Maximum size (mm): 2400x5000

Minimum size (mm): 300 x300

Thickness (mm): 4, 5, 6, 8, 10, 12, 15, 19

Quality

Conform to EN14179 standard.


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