jmccustomknives
For those that's seen my gas forge, one of the things I did for the design was to make it easy to rebuild.  Welding cable is messy and the borax will eat up everything it touches.  Today I had to do a rebuild.  I obtained some soft firebricks to replace the top bricks that were hard.
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So I took it apart and this was just one of the hard bricks.  Think these forges don't get hot?
IMG_0865.JPG  After firing it up after the rebuild I notices something.  It was hotter.  Not only that but the soft bricks weren't glowing like the hard bricks did.  It also didn't take as long to heat up.  Just thought I'd share this experience.

Rule #10;  "I can make that" translates to; "I'm to cheap to buy it new."

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Dustin Stephens
Yes the soft brick is much more insulating and will save fuel greatly. I've been researching it and am going to build one like this with a hard 42% alumina floor Click image for larger version - Name: image.png, Views: 22, Size: 1.69 MB
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NorrinRadd
hey JMC,
Do you coat your fire bricks with a "kiln wash"? I've been reading about this and it seems like its supposed to make them last longer and possibly contain more heat. But I don't know first hand and was curious what you know about it.

any of ya'll that use gas forges can chime in if you have any experience with it as well [smile]
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Skarzs the Cave Troll
My own gas forge has a kaolwool lining, but the floor is a piece of kiln shelving, rather than brick. From my experience it doesn't soak up heat as much as brick, and it hasn't warped yet despite the welding heat it burns at. Borax will eat into it, but since I don't use it for welding on a regular basis, I think it's going to last a long time.
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NorrinRadd
hey skarzs
I have read that the kiln shelf is the way to go. I will probably get some to replace my fireplace bricks when I need too. Did you use rigidizer or kiln wash on your kaowool?
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jmccustomknives
I didn't use anything on the kaowool as it was used as an insulator between the inner bricks and outer.

Rule #10;  "I can make that" translates to; "I'm to cheap to buy it new."

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Skarzs the Cave Troll
NorrinRadd wrote:
hey skarzs
I have read that the kiln shelf is the way to go. I will probably get some to replace my fireplace bricks when I need too. Did you use rigidizer or kiln wash on your kaowool?
Neither. The fellow that helped me make my forge said that the kaolwool would fall down eventually, but I've had no problem with it, though the round shape of my forge may have something to do with that. I'm not sure if either of those substances you're talking about are for hardening the wool so that it is less likely to tear, or to make them more solid. So. . . I wish I could help in regards to the rigidizer or kiln wash, but the best I can say is that I've had no problems with just plain kaolwool.
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Anthony San Miguel
If you are looking for a rigidizer or IR reflectory then visit Wayne Coe's website. He has less expensive alternatives than the usual ITC 100 and castable refractory.
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NorrinRadd
Hey Anthony! Coincidentally I have actually been in contact with him in the past couple of days. I'm thinking about going with the merikote. Thank for the reply dude.
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Anthony San Miguel
I will be calling him pretty soon too. I already have several feet of ceramic blanket and a 5 gallon air tank.
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