Bill Aycock on tue 23 sep 97
Martin-
The type of IFB made from diatomaceous earth, either by cutting or by
reforming, is generally weaker than the types formed by more controlled
means. I have had disasters from the crumbling of some of them.
The other type is formed by mixing fireclay, grog, and other refractory
materials,in various proportions, and introducing bubbles, or small
cavities, before firing. Some methods use a chemical gas former to make the
bubbles, others introduce them by mixing in something like sawdust, to be
fired out, slowly. In general, most I have seen recently have had formed
bubbles. By varying the size and percentage of the cavities, the insulating
properties and density are controlled.
Both types are formed to final shape by cutting. (usually)
My early copy of "Kilns", by Rhodes, has a short discussion on these
characteristics, and I have seen several other references that I cant find,
just at the moment.
Bill, about to go out and shovel some half-fired fireclay (Kitty litter),
on Persimmon Hill.
At 09:17 AM 9/22/97 EDT, you wrote:
>----------------------------Original message----------------------------
>>many things that are fired well above ^10 do not ring. Try IFB, for
>>instance.
>>
>>Bill- feeling crusty on Persimmon Hill
>
>I never thought about IFB being fired in the manufacture. I've always
>thought of it as blocks of material "cut" from larger blocks of
>"diatomaceous earth" material. I've never seen any material regarding its
>manufacture that I can remember. I'd be interested to hear a description
>of the process.
>
>warm regards,
>Martin.
>
>
Bill Aycock --- Persimmon Hill --- Woodville, Alabama, US 35776
--- (in the N.E. corner of the State) ---
also -- W4BSG -- Grid EM64vr
baycock@hiwaay.net
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