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Old 07-12-2017, 12:40 PM
Mike Kaplan Mike Kaplan is offline
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Casting a new crown.

I'm looking for some advice. I am building a new furnace and looking at my old crown I see that the skin it is peeling in layers.
Are used to cast a light 30. Are there any recommendations for a crown that would last longer without peeling?
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Old 07-12-2017, 02:18 PM
Eben Horton Eben Horton is online now
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Can't beat castolite 30 imho..... crowns are meant to be replaced every 10-15 years I think.

That said, a friend used huge silicon carbide kiln shelves as a crown and swears by them.
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Old 07-12-2017, 04:15 PM
Kenny Pieper Kenny Pieper is online now
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Quote:
Originally Posted by Mike Kaplan View Post
I'm looking for some advice. I am building a new furnace and looking at my old crown I see that the skin it is peeling in layers.
Are used to cast a light 30. Are there any recommendations for a crown that would last longer without peeling?
If you are melting batch I would recommend that you use something harder and more durable than cast a lite 30. Ask your refractory source. There are so many options now days.
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Old 07-12-2017, 10:42 PM
Mike Kaplan Mike Kaplan is offline
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Thx for the advice. I always seem to forget to ask the experts first.
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Old 07-13-2017, 08:57 AM
Mike Kaplan Mike Kaplan is offline
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I would say this crown lasted 3 yrs and i use cullet. It didnt crack but it is pealing
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Old 07-13-2017, 10:35 AM
Justin Zotynia Justin Zotynia is offline
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I used kastolite 30 for my crown and used cullet worked well no peeling. maybe every furnace environment is different due to design. don't know just that it worked for me.
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Old 07-13-2017, 10:40 AM
Jordan Kube Jordan Kube is online now
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I would use something a little heavier duty than Kast-o-lite. Some people have good success with it. It doesn't seem to be the case in your furnace. Make sure you mix thoroughly and to manufacturer's instructions as well.
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Old 07-13-2017, 11:44 AM
Eben Horton Eben Horton is online now
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I'd bet you a case of beer that when you made your crown 3 or 4 years ago, you made th mix too wet. If you mix it right, it will last a long long time. Mix it wet and the casting will be brittle and won't last. I learned this with glory hole and furnace doors. Also, make it thick. At least 4 inches and give it a nice arch to give it strength
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