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Old 12-14-2019, 04:20 PM
Chris Lowry Chris Lowry is offline
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Kiln shelves

Anyone have a good recommendation for flat kiln shelves for casting and fusing?
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Old 12-14-2019, 04:30 PM
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Pete VanderLaan Pete VanderLaan is offline
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we make kiln shelves at high Temp. 1x24 mullite. We make others too.
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Old 12-14-2019, 04:51 PM
Steven O'Day Steven O'Day is offline
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I use hollow core shelves for fusing. They stay flat and do not hold the heat as long as solid shelves and are lighter.
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Old 12-14-2019, 08:03 PM
Chris Lowry Chris Lowry is offline
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Pete do you make hollow style shelves? Never thought to look at High Temp

Steven do you have a favorite brand I saw the core lite ones, they look nice
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Old 12-15-2019, 08:44 AM
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we do not. we have made tons of shelves for Skutt in the past. I don't know what dimensions are currently available.
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Old 12-15-2019, 11:07 AM
Steven O'Day Steven O'Day is offline
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I don't know the brand, we get the 26 inch diameter ones from Georgie's Ceramics in Portland.
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Old 12-15-2019, 11:40 PM
Charles Friedman Charles Friedman is offline
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Try this

http://www.seattlepotterysupply.com/..._Code=Corelite
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Old 12-18-2019, 07:25 PM
Marty Kremer Marty Kremer is offline
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Those hollow shelves are touchy, especially when they get big. You have to leave them in the kiln, leveled out and up on lots of supports and don't plan on moving them. For fusing, they have to be covered pretty much evenly and you can't put stuff (like a fusing setup on vermiculite board) on one part and not the whole thing.
I've spent lots on them and really enjoyed the honeymoon but that love fades awfully quick with the first crack.

I tried a 24"x40" graphite shelf but ran into deterioration with repeated 1500F cycles. Another expensive marriage gone bad.

Bullseye has an info sheet on covering lots of kiln ground with 20x20 mullite shelves, bridging the gaps with stuff, but it's a lot of work to maintain.

I've ended up with vermiculite board, both 1.5" and 2" thick. They have to be watched for warpage and flipped periodically. The advantages are that they're cheap- shipping costs more than the material and they can be worked with ordinary tools (I use a Japanese pull saw and keep the vacuum cleaner running).

PM if you want more.
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Old 12-18-2019, 07:57 PM
Steven O'Day Steven O'Day is offline
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Marty has some good advice here. We use the hollow core in a dedicated kiln with both a top element in the lid and an element under the shelf which is up about 9 inches from the floor on 4 posts. Most of the work is small student pieces and painted stained glass. We do not fire as often as a commercial shop does. I do put a vermiculite board on it occasionally but it pretty much covers the entire surface. They are occasionally used in the ceramic kiln to 2190f, we've been lucky with no cracking.
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Old 12-19-2019, 08:50 AM
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Iused to get that vermiculite board from Tom at the Other Hi Temp in Fenton Missouri. Its actually machinable.
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Old 12-19-2019, 11:18 AM
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Quote:
Originally Posted by Marty Kremer View Post
Those hollow shelves are touchy, especially when they get big. You have to leave them in the kiln, leveled out and up on lots of supports and don't plan on moving them. For fusing, they have to be covered pretty much evenly and you can't put stuff (like a fusing setup on vermiculite board) on one part and not the whole thing.
I've spent lots on them and really enjoyed the honeymoon but that love fades awfully quick with the first crack.

I tried a 24"x40" graphite shelf but ran into deterioration with repeated 1500F cycles. Another expensive marriage gone bad.

Bullseye has an info sheet on covering lots of kiln ground with 20x20 mullite shelves, bridging the gaps with stuff, but it's a lot of work to maintain.

I've ended up with vermiculite board, both 1.5" and 2" thick. They have to be watched for warpage and flipped periodically. The advantages are that they're cheap- shipping costs more than the material and they can be worked with ordinary tools (I use a Japanese pull saw and keep the vacuum cleaner running).

PM if you want more.
Where did you source the board?
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Old 12-19-2019, 12:32 PM
Rick Kellner Rick Kellner is online now
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Quote:
Originally Posted by Sky Campbell View Post
Where did you source the board?
I notice that Bullseye stocks smaller slabs of it, but apparently only in the 1" thick version.

For larger quantities, maybe look up refractory dealers that carry the Skamol line of products.
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Old 12-19-2019, 12:37 PM
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Pete VanderLaan Pete VanderLaan is offline
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what I got from Hi Temp in Missouri was 4" thick x 48". Quite the beast.
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Old 12-19-2019, 02:31 PM
Marty Kremer Marty Kremer is offline
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Southernserviceco.com

Best to find nearest dealer, given shipping costs.
Check on densities available- it'll affect your handling and your surface.
Do not expect thinfire or kilnwash to hold up as a separator.
I use Unifrax 970A. With the chinese equivalent you get what you pay for.
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Old 12-20-2019, 11:28 PM
Chris Lowry Chris Lowry is offline
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So Marty, you use vermiculite board with Unifrax on top? Is the unifrax a paper? Something you can use on multiple pieces?

I ended up just buying a regular Mullite kiln shelf from Bullseye. I know they are flat and smooth and I got around 200 uses out of the last one.
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Old 12-21-2019, 08:50 AM
Marty Kremer Marty Kremer is offline
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Originally Posted by Chris Lowry View Post
So Marty, you use vermiculite board with Unifrax on top? Is the unifrax a paper? Something you can use on multiple pieces?
Yes
Yes
Sometimes
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