Advantages
The term toughened glass is generally used to describe fully tempered glass but is sometimes used to describe heat strengthened glass as both types undergo a thermal 'toughening' process.
There are two main types of heat treated glass: heat strengthened and fully tempered. Heat strengthened glass is twice as strong as annealed glass while fully tempered glass is typically four to six times the strength of annealed glass and withstands heating in microwave ovens. The difference is the residual stress in the edge and glass surface. Fully tempered glass in the US is generally rated above 65 MPa (9427 psi) in pressure-resistance while heat strengthened glass is between 40 and 55 megapascals (5801 and 7977 psi respectively).
It is important to note that the tempering process does not change the stiffness of the glass. Annealed glass undergoes a similar deflection compared to tempered glass under the same load. But tempered glass can take a higher load and therefore deflects further before breaking.
Read more about this topic: Toughened Glass
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