It is brittle so it breaks easily.
Safety glass breaks if hit by ceramic.
Aaa found that more and more cars are being equipped with laminated side windows that are almost impossible.
Second the rock may have a hardness similar to the glass.
When safety glass shatters it is designed to stay in one place keeping all shards together and preventing sharp edges from harming people.
When safety glass is damaged in this way the damage propagates throughout the glass rapidly and the tension within the glass.
The glass may be able to resist 200kg of evenly distributed load but that is very different from a rock.
Spark plugs are made of aluminum oxide ceramic which is exceptionally hard.
Why will a piece of ceramic break safety glass but a similar sized rock just bounces off.
When regular glass shatters it breaks into several sharp pieces and spreads everywhere.
Safety glass is designed to shatter differently from other types of glass to help prevent injuries from flying shards.
First this is impact not a uniform load.
Normal float glass can be dangerous.
Breaking your car s windows in an emergency might be tougher than you think study says.
When broken the pieces form razor sharp edges that can cause serious injury.
The impact of the shard against the glass creates a tiny structural failing which rapidly spreads the tension through the rest of the screen causing it to break.
I can break a big piece of tempered glass with a little ceramic chip.