Glass Tips from Verrier

Description A frit stretch in the flattening developed two internal cracks at 4:00 and 8:00 going through colours (but not felt on top ...

Why is the stress not relieved after the strain point when slumping? The answer relates to whether it is on the cool or on the heat up. Co...

This information has been taken from various sources. Some manufacturers may change the composition of their glasses or the published infor...

Photo credit: Bullseye Glass Co. It is often advocated that there should be a soak at the strain point to even out the temperature throughou...

  Glass 101: Glass Processing Temperatures Posted  Rebecca Molt  on  Aug 14, 2019 Glass is an amorphous solid with no long-range order. This...

NOTE: completely revised 31 December 2021 After  Bullseye published annealing tables for thick slabs, s ome people feel they need to use th...

A critical range is the temperature around the annealing point. The upper and lower limits of this range are known as the softening and str...

There are frequent suggestions that holds in the rise of temperature for glass are required.  Various justifications are given.  A few notes...

“My bubble squeeze temperature is higher than my slumping temperature.“  The writer goes on to say that their bubble squeeze is at 1250°F/67...

As a result of various memory failures, I've done a bit of searching on the annealing of float glass.   There are now various composit...

Various glasses have different temperature characteristics. This listing is an attempt to indicate the differences between a variety of popu...