how automotive glass works
This type of glass is used for windows around the car (
Also known as side window)
Window behind (or backlite).
Tempered glass is produced by heating, and then the glass is quickly cooled to room temperature through the blower system.
The surface cooling speed of the glass is much faster than the center of the glass and shrinks, causing pressure stress, while the center of the glass expands due to temperature, resulting in tensile stress.
What does this mean?
Imagine that a piece of glass can be pulled or stretched to a certain length (tensile stress)
When pushed down and compressed (
The tensile and push stresses obtained through the heating and cooling processes give the tempered glass a tensile and compression strength.
The difference between the two makes the strength of the glass 5 to 10 times that of the original.
The edges of typical tempered glass are very weak.
This is partly due to the rapid release of heat during the cooling phase of the tempering process.
To help compensate for this weaker area, the glass is ground down at the edge.
When the tempered glass is broken, it breaks into small, dull pieces.
The difference between compression and tensile stress enables the glass to break in this way.
The pull and push of the glass generate a lot of energy in the tempering process.
This energy is released when the glass is broken, causing the glass to break into small pieces [
Source: AIS glass solution.
Tempered glass because of its strength, can withstand the daily use of the car.
Without it, our car is filled with glass every time we encounter potholes, bump fenders, or close the door.