Evren Olcay on tue 7 nov 06
Hi all,
I would like to know the difference btw brick insulation and fiber
insulation. I would appreciate if you could tell me about it as I do not
know much about gas kilns.
Thanks,
Evren
Hank Murrow on tue 7 nov 06
On Nov 7, 2006, at 8:23 AM, Evren Olcay wrote:
> Hi all,
>
> I would like to know the difference btw brick insulation and fiber
> insulation. I would appreciate if you could tell me about it as I do
> not
> know much about gas kilns.
Brick may be divided into insulating firebrick (with ratings from 2000F
to 3000F) and hardbrick (with ratings from 2300F to 3000F). Ceramic
fiber can be rated from 2000F to 3000F. The easiest way to get a feel
for the differences is to place an insulating brick, a hardbrick, and a
piece of ceramic fiber (cut to the same dimensions) on a cement floor
and try to move them with a small diameter flexible bamboo (or?) stick.
The fiber will easily move, while the IFB will move harder, and the
hardbrick will bend the stick. You are visualizing heat storage. The
hardbrick stores and requires more heat to achieve temperature and
cools slower as it releases all that heat. Ditto although less so for
the IFB. Fiber stores much less heat(and requires much less heat to
achieve temperature, while cooling faster. Ceramic fiber can make a
very efficient kiln, but due to its relative lack of structural
strength, requires more care in the design of the shell. See the
article on my Doorless Fiberkiln design @
http://www.ceramicsmonthly.org/mustreads/shinofire.asp scroll down to
the kiln article for some discussion of designing for fiber
construction.
Cheers, Hank
www.murrow.biz/hank
Marcia Selsor on tue 7 nov 06
About thirty years ago I got an industry manual of pyro techno
dynamics. I still have it buried somewhere.
It explained a lot about hard brick versus insulation brick versus
fiber. Basically, what i can remember off the top of my head is
something like this
One layer of insulation bricks is equal to 5 courses of hard brick
"R" factor-wise. I believe a good 1 inch layar of ceramic blanket is
equal to
14 layers of hard brick. This may be exaggerated but you get the jest.
Marcia Selsor
http://marciaselsor.com
> Hi all,
>
> I would like to know the difference btw brick insulation and fiber
> insulation. I would appreciate if you could tell me about it as I
> do not
> know much about gas kilns.
>
> Thanks,
> Evren
>
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