#AskGlaston Episode 38: Why does 1/2 inch glass break on the unloading table?

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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Über den Autor

Taneli Ylinen

As Product Manager of Flat Tempering at Glaston, Taneli is an enthusiastic developer. He enjoys brainstorming and seeing abstract ideas turn into real-world innovations and products that benefit customers and fulfill emerging market needs. He’s a Master of Engineering who spends most of his free time inside a garage working on the next big breakthrough. He has other hidden talents, too. Taneli once played a well-known character on a famous Finnish children’s TV show.