PITTSBURGH (KDKA) -- In June 2013, Glen Brunken was meeting a friend for lunch. But that lunch never happened. The 69-year-old retired art professor from Slippery Rock University fell through the ...

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 ...

In general, heat-treated glass is at least two to four times stronger than annealed (untreated) glass. 3. Rate of cooling determines strength. During heat treatment, annealed (untreated) glass lites ...

“It almost absolutely had to be annealed, non-heat treated glass. I can't see how he can go through it otherwise,” Jones said. Annealed glass is what is commonly called plate glass. Depending ...

To help reduce the risk of injury, security or safety window film should be installed to minimize the chance of a person being cut or pierced by broken glass. When annealed glass breaks ...