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  #26  
Old 02-12-2020, 11:02 AM
Steven O'Day Steven O'Day is offline
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I experimented with alumina hydrate a while ago in a classroom situation. It was to try and reduce the amount of silica dust. Straight up substitution for silica in the mix. This is in there as an aggregate, it will be interesting to see how the calcium aluminate will work.

Like Rossana said it gave a much nicer surface that released better. Ended up not using it because of the cost for student molds but I do use it for my work if I am not cold working the surfaces.
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  #27  
Old 02-12-2020, 01:29 PM
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My current question there is "Why Alumina Hydrate" and not calcined alumina. The hydrate is just going to have a bunch of chemicaly bound water to deal with.
The calcium aluminate is an entirely different question. I'll try it because I have it. Dan Clayman just sent me an extensive paper on the process and I'll curl up with it and a glass of single malt later today.
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  #28  
Old 02-12-2020, 01:31 PM
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Quote:
Originally Posted by Rosanna Gusler View Post
The alumina ones had way less flashing and the quality of the surface was like buttah. ... Less silica = less issues with quartz inversion .
***
what do you mean they had way less flashing?
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  #29  
Old 02-12-2020, 01:46 PM
Shawn Everette Shawn Everette is offline
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I actually came across a similar query today while researching bead release. In that case they tended towards the calcined since it rendered the mix less hydrophilic, so it wouldn't take on moisture from the air as readily when dried and had a better mix consistency.

In your case it might mess with the how it bonds with the plaster since it's rendered inert. There was also talk of diatomaceous earth, which I've used, but would only recommend for backing since it wants to stick the glass.
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Old 02-12-2020, 02:58 PM
Steven O'Day Steven O'Day is offline
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I used the hydrate because it was in the shop, we have it in the ceramics studio for kiln wash and rarely as a glaze ingredient. In glazes the thought is the hydrate will stay in suspension easier until firing.
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Old 02-12-2020, 03:16 PM
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Originally Posted by Steven O'Day View Post
In glazes the thought is the hydrate will stay in suspension easier until firing.
****
I think that's good thinking but it's the firing stage I'm concerned with driving that moisture off. I'll try it both ways.
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  #32  
Old 02-12-2020, 03:17 PM
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In your case it might mess with the how it bonds with the plaster since it's rendered inert.
****
Which is part of why I want to try the calcium aluminate, a refractory cement if you will.
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  #33  
Old 02-13-2020, 02:46 PM
Rosanna Gusler Rosanna Gusler is offline
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Quote:
Originally Posted by Pete VanderLaan View Post
***
what do you mean they had way less flashing?
the molds were under engineered . That being said , most plaster silica molds tend to crack on The way up due to I assume quartz inversion. Then at casting temps, the glass flows into those cracks some. The a!umina ones had probably a quarter of the flashing both in size (width) and number.
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Old 02-13-2020, 04:13 PM
Eben Horton Eben Horton is offline
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I have seen some very nice castings done with zircon (mold mix 6) backed up with mizzou for oven casting or suspended in sand for hot pouring. Acetylene soot really helps keep the glass from bonding to the mold. It comes out glossy
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Old 02-13-2020, 06:21 PM
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Longer term, I'm looking for cast glass that shows the diffusion of light in strike glasses that have been struck, cast, then blasted and etched. It's a process. My early work has given me amazing color work.
I don't care if I sell it at all. It's pure investigation. I'm really fortunate I can do that. Not many can. We get the fuel bills and just pay them and go on.
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Old 02-14-2020, 09:43 AM
Eben Horton Eben Horton is offline
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Nice. I canít wait to see what you come up with.

And nope. I sure as hell cant afford to spend any time making what I want... my studio (the new one) has a massive overhead to cover
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Old 02-14-2020, 11:02 AM
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Mark Rosenbaum Mark Rosenbaum is offline
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And nope. I sure as hell cant afford to spend any time making what I want... my studio (the new one) has a massive overhead to cover
Welcome to ownership of a large shop/gallery! I hope that you are getting a lot more foot traffic in the new shop....
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  #38  
Old 02-14-2020, 11:22 AM
Eben Horton Eben Horton is offline
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We are !! Itís been a great transition.
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  #39  
Old 02-14-2020, 12:03 PM
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Pete VanderLaan Pete VanderLaan is offline
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I remember it only too well. We could have 35K days in Santa Fe. We also had a 6K rent, seven employees and very faint hearts. The off season was hard.

Today I'm charging clear for the first time since august. It will go straight to the crusher.
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  #40  
Old 02-14-2020, 04:02 PM
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We are !! Itís been a great transition.
Great to hear that it is successful and a great move!
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  #41  
Old 02-14-2020, 06:32 PM
Larry Cazes Larry Cazes is offline
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Quote:
Originally Posted by Pete VanderLaan View Post
Longer term, I'm looking for cast glass that shows the diffusion of light in strike glasses that have been struck, cast, then blasted and etched. It's a process. My early work has given me amazing color work.
I don't care if I sell it at all. It's pure investigation. I'm really fortunate I can do that. Not many can. We get the fuel bills and just pay them and go on.
I did a large, 68 artists attending, mostly boro marble specific show in Eureka last weekend and met George Buquette(sp?) for the first time. He had some really nicely done soda lime 18"+ cast and ground spheres made with various striking colors of his own formulations. They were perched on nice lit sculptural stands of various materials. Really nice work.
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  #42  
Old 02-14-2020, 06:44 PM
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His work is usually phosphate
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