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Old 07-01-2022, 09:30 AM
Drew Hine Drew Hine is offline
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spruce pine gaffer batch

Hello, I came across a pallet of spruce pine batch gaffer formula from a glass caster going out of business. I have been melting it for the last month with no issues. I was making production pieces today and realized how soft the glass is. It just does not set up on the pipe quick enough to keep up with the pace of what we are making
My question is can I add anything to the batch to stiffen it up? I was thinking alumina hydrate? Any help would be appreciated.
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Old 07-01-2022, 09:36 AM
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Pete VanderLaan Pete VanderLaan is offline
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SP claimed to me that they only sold two tons of the Gaffer batch, the same amount they said they had sold of mine. I think that is just bad record keeping.

To change the batch will change the expansion. To stiffen it will take the expansion down a good deal. Are you aware of that? Currently, it was calc'd as a 96, making it compatible with all gaffer color although there seem to be going issues with copper blue opals and greens, not surprising.

So if you don't think changing the expansion will pose a problem for you, simply adding silica will take it down. It must be remixed. You may regret what you get. Silica is quite powerful moving expansion.
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Old 07-01-2022, 02:35 PM
Eben Horton Eben Horton is offline
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Compressed air is your friend
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Old 07-01-2022, 08:38 PM
Andrew Horch Andrew Horch is offline
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Maybe find someone who wants a very soft glass and trade with them.
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Old 07-02-2022, 06:22 AM
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Pete VanderLaan Pete VanderLaan is offline
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I would just set it aside for the right occasion
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Old 07-05-2022, 01:01 PM
Art Freas Art Freas is offline
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Quote:
Originally Posted by Eben Horton View Post
Compressed air is your friend
Big thumbs up to that. When we used System 96 Studio original we didn't use air at all because the last thing you wanted to shorten the working time. Sys 96 was tough if you needed long working time. Now that we are using Bomma we definitely use air when doing production. Production can definitely make you want shorter working time with some products, one of the reasons we never made the switch to Spruce.
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Old 07-11-2022, 02:36 PM
Brian Wong Shui Brian Wong Shui is offline
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Quote:
Originally Posted by Pete VanderLaan View Post
SP claimed to me that they only sold two tons of the Gaffer batch, the same amount they said they had sold of mine. I think that is just bad record keeping.....
Over what time period was this claim made? When our studio was operational, we went through 4-6 tons/year of Gaffer from Spruce Pine.
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Old 07-12-2022, 07:48 AM
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According to Greg about four months back, he claimed that SP only sold two tons of Gaffer, the same amount that they sold of mine or so he said. He did not specify any time period. Spruce Pine is hard to believe on this point.
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