John Rodgers on wed 18 dec 02
I have a really nice order for flame-spreaders associated with an
antique boiler. The spreaders are no longer available and I have been
asked to make them.
I need a castable refractory body that doesn't shrink. My local supplier
assured me the material he had was right for the job, and was good for
3000F but it turned out to be full of pebbles. That simply doesn't work
in this application.
What ever the body, it must be very smooth. These are not big, sort of
like a low cone with three legs sticking up. 2-1/2 inches in diameter,
top 1/2 in. thick, three legs 2-1/2 inches long approx. 1/4 in. thick.
So cannot have large gravelley stuff in it. Needs to be like a good clay
body, but castable, preferably like a slip when mixed, but I can
probably make a paste work.
Any info would be appreciated.
Thanks,
John Rodgers
Birmingham, AL
Hank Murrow on wed 18 dec 02
On Wednesday, December 18, 2002, at 08:23 AM, John Rodgers wrote:
> I have a really nice order for flame-spreaders associated with an
> antique boiler. The spreaders are no longer available and I have been
> asked to make them. I need a castable refractory body that doesn't
> shrink. My local supplier
> assured me the material he had was right for the job, and was good for
> 3000F but it turned out to be full of pebbles. That simply doesn't work
> in this application. What ever the body, it must be very smooth. These
> are not big, sort of
> like a low cone with three legs sticking up. 2-1/2 inches in diameter,
> top 1/2 in. thick, three legs 2-1/2 inches long approx. 1/4 in. thick.
> So cannot have large gravelley stuff in it. Needs to be like a good
> clay
> body, but castable, preferably like a slip when mixed, but I can
> probably make a paste work.
>
Dear John;
I use a castable by Pryor-Giggey called "PHLOCAST 30S", which is pretty
smooth and fine-grained, and has 12% Silicon-Carbide in it, which I
imagine would aid in your application. The mold surface is black in
color and glass smooth, so maybe it would work for you. Got to be
careful about getting these castables too wet, or they don't set up
properly.
Cheers, Hank in Eugene
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