alumina cement and perlite

[bartjmeijer]

Hi guys,

I have been reading here since months and got a question.
All the recipe's I see have water-glass, fireclay and other high profile stuff in it.
Can it be done simpler? I might not have found the right post, but I was wondering.


I have Calight 40 high alumina cement containing about 40 % of Al2O3. (The bag states it can handle up to 1400C)
I got perlite 0.5mm-5mm
I got vermiculite course 3-5 mm
I have chamotte grit, 0.5-3mm

Is it possible to make fireproof lining for say a heatriser with just the Calight 40 and perlite or vermiculite?
Or do I need to add chamotte?
Or is it not possible at all with these ingredients?

Cheers Bart

[Deleted]

Seems to be a typical Calcium aluminate cement, which are standard binders for refractories.
Although 40% alumina is at the lower end,
in this respect "high alumina cement" is somewhat misleading.

Perlite or vermiculite for insulation.
Chamotte for tougher things.

With respect to perlite and vermiculite finer would be better,
coarse gives more brittle results.

[bartjmeijer]

Thanks Karl

The perlite has a lot of fine between the course stuff, the biggest is actually 3mm.

For a heatriser often is said, the higher the insulation the better it works.
So could it be possible to just use perlite and alumina cement?
or should some chamotte grit be added?

Cheers Bart

[Deleted]

The coarse chamotte would only act as thermal bridges.