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fxpose 06-07-2010 05:26 PM

Castable refractory cement mix
I'm about to cast my vent and have 25 lbs of this dry mix which can yield 2 sq/ft at 1 1/4" of cement.
My question is, can I add some crushed firebrick to this mix to increase volume? I understand I'm altering the mix ratio by doing this and thus may weaken the cast.
My reason for doing this is because I may not have enough cement to fill the's close by my estimation.


wlively 06-08-2010 06:48 PM

Re: Castable refractory cement mix
You can do anything, once.:)

I would think it depends on how much you are going to add and how challenging a shape your vent casting will be and the limitations of the refractory. This is a critical piece, so best to call the manufacturer or order some more.

I ran into the similar problem with mine, as I was casting the dome plug and the vent transition and wasn't sure there was enough KS-4. I ended up tapering 4 sides of a full brick and sitting that in the middle of the dome plug. I figured if the bond let go the taper would hold the brick. So, far it is still bonded very well, brick and plug are solid.

fxpose 06-09-2010 09:43 AM

Re: Castable refractory cement mix
Thanks Wade. The vent shape is very a simple rectangular box with a slight curvature at the front face.
I think I will take some firebrick remnants and crush them down to tiny pieces and add them accordingly to the mix.


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