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-   -   Refractory mortar vs castable? (http://www.fornobravo.com/forum/f28/refractory-mortar-vs-castable-2793.html)

Dave M 10-18-2007 09:28 AM

Refractory mortar vs castable?
 
Is refractory mortar, like RefMix, the same as refractory castable?

Could RefMix be used to cast whole shapes like dome entrances or small domes?

Thanks,
dave

Dave M 10-19-2007 09:50 AM

Re: Refractory mortar vs castable?
 
This seems like a pretty straight fowrard one, no body knows the answer to this? :confused:

dmun 10-19-2007 10:36 AM

Re: Refractory mortar vs castable?
 
The short answer is no. Like regular mortar mix differs from concrete mix (it's sticky and has finer aggregates) castable refractory is different stuff from refractory mortar. Mortar might well crack when used that thickly.

Dave M 10-19-2007 10:51 AM

Re: Refractory mortar vs castable?
 
Quote:

Originally Posted by dmun (Post 17596)
The short answer is no. Like regular mortar mix differs from concrete mix (it's sticky and has finer aggregates) castable refractory is different stuff from refractory mortar. Mortar might well crack when used that thickly.

As I suspected, but I wan't sure if what was being called "mortar" in the case of RefMix was infact true mortar or cement used as mortar to bind the bricks.

Thanks for the reply.

CanuckJim 10-19-2007 11:09 AM

Re: Refractory mortar vs castable?
 
Dave,

I'm no expert on the exact composition of castable refractories, but I have used a fair bit of them. Castables contain refractory aggregate as well as refractory cement. The two types I've used are Kastite Lite (which is not meant for direct flame exposure) and Kastite (which is). The difference between them, as I understand it, is the percentages of of alumina and other materials. An equal cubic measure of Kastite Lite would be significantly lighter when cured than Kastite. There is also Super Kastite (which is even denser). I have cast vents out of Kastite and will be casting a lintel out of it next week, but I've never used Super Kastite.

Jim

james 10-19-2007 01:08 PM

Re: Refractory mortar vs castable?
 
RefMix is a mortar used to set precast pizza oven and fireplace pieces as well as fire bricks. It is very smooth, like a masons mortar. As others have noted, it is designed to be applied pretty thinly. The technical spec limits the thickness to about 2 1/2".
James

Wlodek 10-30-2007 12:26 PM

Re: Refractory mortar vs castable?
 
Just to add the castable side: the helpful man from Purimachos told me that I can use the castable (the one he suggested, not just any) to join elements of precast ovens.

Best wishes,
W.


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