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Old 02-11-2020, 11:14 AM
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No “holds” in Bomma info about annealing

Is this unusual?
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Old 02-11-2020, 12:05 PM
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Bomma is a glass and any glass will need to adhere to reasonable annealing schedules. Soaking after your last piece has always been a good plan. A hold at strain point is a good plan. While I don't know the individual specs, based on the generic, I would hold at 700F for a while before going down.

Spruce Pine, East Bay and Olympic are all handling the Bomma.
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Old 02-11-2020, 12:30 PM
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Thanks pete. That’s what I figured. We are still dealing with seedy glass so figured we’d do annealing tests anyway
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Old 02-11-2020, 01:58 PM
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what did you pay per lb if I might ask and where from?
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Old 02-11-2020, 02:01 PM
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Spruce pine $1.40 plus shipping.
I think for years I’ve been confused about what temp to hold your work at vs annealing temp
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Old 02-11-2020, 03:08 PM
Shawn Everette Shawn Everette is online now
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Generically you hold at anneal, but as Pete says, it's a spectrum. The 700* hold seems low to me. We're doing a 3 hour 950* anneal with a slow ramp to 700* for strain, no holds from there on. Paperweights have been the menu dejour for most of the semester, and everything seems hunky dory.
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Old 02-11-2020, 04:06 PM
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It's entirely tied to the strain point of the particular glass. Below the strain point, no further annealing can occur. From there on, you're dealing with Thermal Shock.
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Old 02-11-2020, 04:08 PM
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Quote:
Originally Posted by Pringle Teetor View Post
Spruce pine $1.40 plus shipping.
I think for years I’ve been confused about what temp to hold your work at vs annealing temp
***
It will be interesting to see if that price holds.
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Old 02-11-2020, 06:05 PM
Larry Cazes Larry Cazes is offline
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Quote:
Originally Posted by Pringle Teetor View Post
Spruce pine $1.40 plus shipping.
I think for years I’ve been confused about what temp to hold your work at vs annealing temp
For technical accuracy.....Its not advisable with Borosilicate to hold for long working periods at the annealing range for certain colors.
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Old 02-11-2020, 06:46 PM
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Indeed. Glass on the molecular level is very active stuff. Croucher and I used to talk about ruining cad sel rods just heating them in the gloryhole. At the same time, many colors mature beautifully once in the annealer.

The proof Pringle, is in a polarized reading of the work.
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Old 02-11-2020, 09:08 PM
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I will be looking at that tomorrow!
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