Glass Tips from Verrier

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...

The visual evidence relating to this enquiry is a sharp-edged break through the middle of the slumped piece. The two parts have slumped se...

Once you have an initial idea of the source of the problem, think about it.   Test it against the evidence.   Is there enough evidence to ma...

A schedule was presented for a slumping problem of a 6mm/0.25” blank.   It consisted of three segments each of a rate of 277C/500F with shor...

  It’s a schedule I always use. This is a frequent statement in response to a firing that has gone wrong. You don't always fuse the ...

  I had a piece crack due to an annealing oops. I put powder on it and put it back in at a higher temp with a much longer anneal time. It lo...

The Identification of stress is important in investigating the causes of stress. We have well established clues to help us with our glass se...

Credit: https://immermanglass.com/about-kilnforming/cracks/ The speculation about breaks caused by inadequate annealing of the piece on the ...

This conversation is reproduced by permission (with some editing out of extraneous information). It is presented as an example of how cond...