Page 25 - Curriculum Visions Dynamic Book

glass, safe from blows and bumps, that makes the glass less liable to break. When glass is treated in this way, it can also take greater loads than when it is unstressed. It is called toughened glass.
Toughened glass can also be obtained by putting glass under stress while it is being made. In this case the whole surface is under compression. This is called tempering. Tempered glass is often a legal requirement in
25