This week, we are dealing with the following  two questions:

1. Why does 1/2 inch glass break on the unloading table?
2. How to get a perfect break test on 1/8 inch glass?

For this week’s questions, see our full video response below!

Why does 1/2 inch glass break on the unloading table?

There are several reasons why glass breaks on the unloading table. To find out what those reasons are, we would need to know more about the fragmentation, glass and tempering parameters. Is the glass breaking into small or large pieces? What is the glass temperature before cooling and is it uniform? What cooling pressure is used? Is the glass edge work good?

How to get a perfect break test on 1/8 inch glass?

To meet the break test standard EN12150–1 for 1/8 inch glass, which is about 3 mm thick, the stress level has to be a few MPa higher than in 4 mm (5/32 inch) glass. To reach this stress level, the cooling pressure has to be about double, compared to 4 mm glass, and the glass temperature before quenching has to be about 5 degrees higher than for 4 mm glass.

 

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