The various types of car glass are prone to damage from different sources. This can include vandalism, an accident, rocks kicked up from passing traffic among other sources of damage.
Whilst the front windscreen is made up of two layers of safety glass laminated with a plastic layer between, the side and rear windows are made from single layers of safety glass.
Safety glass is constructed in such a way that it completely shatters into pebble-sized pieces after an impact on it. These pebble-sized pieces of glass are much less sharp than the ordinary broken glass fragments. The safety glass when broken does not form pointy shards thus making the risk of getting hurt inside the vehicle lower.
Car Windows Safety Glass
The safety glass used on car windows is manufactured through the process of tempering. This involves heating the glass to a high temperature then cooling it rapidly. The outside of the glass is thus put into a state of compression whilst the inside is put under tension. This process is what ensures the glass shatters on impact.
The tempered glass on windows is also important during accidents as it is easy to break in the event of an emergency escape from the car or if you are stuck inside the car.
Windscreen Safety Glass
On a windscreen, the two outside layers are curved glasses heated to mold then cooled down rapidly just like the safety glass for car windows. The difference now comes where the two layers of curved glasses are placed around one layer of plastic that is bonded into the frame.
Because of this tough layer of plastic in between the glasses, when your windshield gets hit by an object, the glass sticks to the plastic layer rather than breaking off into shards.
This is a structural modification that ensures the safety of the car occupants in the event of an accident. This also helps the roof not to collapse as the windscreen holds the roof in its position.
Therefore on impact, the plastic layer on the windshield allows for a crack from the pressure rather than allowing the entire windshield to shatter, becoming a hazard or danger to the passengers.
Do you have a cracked windscreen that you need repaired or replaced? Contact Metro Auto Glass now for a free quote.