Why Drilling Hole size should same as glass thickness at least?

Thermal tempered glass which is a glass product by changing its inner Central Stress through heating the soda lime glass’s surface close to its softening point and cool it rapidly (usually also called air-cooling).

 

The CS for thermal tempered glass is 90mpa to 140mpa.

 

When drilling size is less than 3 times of the glass thickness or the aperture is less than the thickness of the glass, the CS of the hole cannot evenly dispersed while the CS around the hole is quite concentrated when cooling the glass during thermal tempering.

 

That is to say, the yield rate will be very low when drilling size is smaller than glass thickness during tempering. The glass will be easily cracked during tempering.

 cracked glass

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Post time: Nov-27-2019

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