Heat Strengthened is the result of passing a sheet of glass through a specialized process that evenly heats up the glass at a slow rate for a prolonged period of time. Resulting in a well-balanced and evenly stressed glass type that duplicates the strength of annealed glass. Although not as though as fully tempered glass, its inherent flatness and light transmission properties make it a popular choice for designers working on projects that require optimal ocular quality.
This is the most common glass in the market, it is also one of the least expensive and safest options available.
Tempered Glass is about 6 times stronger than annealed glass and about 2 times stronger than Heat Strengthened Glass. Tempered Glass is widely used in environments were strict safety standards are upheld. When shattered, the glass falls into smaller pieces allowing it to stay intact and making it much safer for anyone nearby at the time of impact.
At the time of manufacturing, tempered Glass sheets pass through a tempering furnace that has been heated to the industry standard of 620 degrees Celcius. The heating process is followed by a quenching process – throughout which the glass is sprayed by a rapid succession of high-pressure air gusts. While the exterior of the glass cools, the interior remains warm, causing a forced push and pull relationship between the exterior and interior of the glass, and in doing so, giving Tempered Glass its superior mechanical strength.
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