would not be sufficient to break a glass ceiling. Safety glass is tempered, laminated, or both. Tempered glass is heated to extremely high temperatures and cooled quickly at the surface.

Tempered glass is about four times stronger than "ordinary," or annealed, glass. And unlike annealed glass, which can shatter into jagged shards when broken, tempered glass fractures into small ...

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They are also more resistant to mechanical stress, so are less likely to shatter than ordinary glass. Tempered glass is soda-lime glass that has been heat-tempered. This material has a higher ...

If it does break, tempered glass forms rounded, cube-shaped chunks, instead of the sharp shards of untempered soda lime glass—think about the last time you dropped a drinking glass. First ...