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  #1  
Old 2015-02-08, 4:14pm
jhamilton117's Avatar
jhamilton117 jhamilton117 is offline
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Join Date: Mar 26, 2013
Location: Pennsylvania
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Default Kiln questions about firebrick

Hey everyone, quick question or two for the masses regarding insulating fire brick!
1. Whats the difference between G and K type firebrick? Ex. G26 vs. K26

2. Whats the opinion on using a denser, harder refactory brick for the floor of the kiln?

I was thinkinh about building a subfloor in my kiln with denser brick to make the soft brick more easily replacable as it gets torn up. But now im wondering if itd be better to put the dense brick inside on the floor with the soft brick underneath it to prevent excess thremal transfer, then i have the benefit of the brick lasting longer and less kiln dust to deal with on my glass.

oh one last question,
Any reason that i shouldnt use G-26 firebrick instead of K-23? K23 looks to run about $4-5 per brick whereas i can buy G-26 for $1 per brick...
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Old 2015-02-21, 10:13am
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GLASSFREEK GLASSFREEK is offline
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No dif from the g or k but the higher the # the less insulating qualities you get. But the lower the # is the softer the brick is.
We use k 23 in all our kilns and k26 in our furnace's, back up with frax. there is also 2 1/2 inch and 3 inch in both.
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