Homemade Furnace Liner(also can be used in a fire pot)

[meco3hp]

4 gal. part fireclay
4 gal. grog
4 gal. silica sand
3 quarts of borax powder

Fireclay can be gotten at most fireplace stores, and lumber yards. Grog is crushed fire bricks. This is a key ingrediant, to eleminate shrinking, and cracking.

Mix thoroughly while dry.

Water should be sprinkled over the dry mixed ingredients while stirring, until mixed completely to a consistency that can be made into a ball in your fist that can be broken cleanly in two. When it is to that point, you should cover with plastic over night.

It will keep indefinatly in a sealed bucket.

z

[Archie Zietman]

are there substitutes to firclay which work as well?

[meco3hp]

Hello,
Not that I know of. You might be able to find some natural clay to use, in your area.

[Archie Zietman]

thanks!

[meco3hp]

I have made it and used it with out the borax powder.

[Black Ink]

Can I make the grog myself If I cant find It?Or is there a sub I can find @ home depot.

[Ice Czar]

Originally Posted by Archie Zietman

are there substitutes to firclay which work as well?

cat litter (bentonite clay)
but it needs to be ground

Originally Posted by Black Ink

Can I make the grog myself If I cant find It?Or is there a sub I can find @ home depot.

grog is a clay\ceramic that has already been fired, if you have a local potter, his broken\exploded pots would be ideal, again needs to be broken up to a suitable granular dimension

other insulative additives
Vermiculite
Sawdust (the coarser the better, chainsaw particles are ideal) turns to little charcoalized insulative pockets

additional insulative barriers will make the forge\kiln\furnace more effcient, a box in a box or barrel in a barrel with rock wool, Vermiculite or other air trapping fireproof material with a low thermal mass

the more thermal mass the forge\kiln\furnace has the more energy it will take to get it up to a given temperature, but the better it will hold that temperature (principle behind a masonry heater) but unless you plan on leaving it on for days at a time, its better to have a low thermal mass with a high insulative value

[welder19]

Better than generic "fire clay" is epk kaolin clay, all those supplies are best bought at a ceramics/pottery supply such as;

http://http://www.baileypottery.com/...-chemicals.htm

http://http://www.axner.com/axner/ma...ball-clays.php

You can easily make a refractory to withstand 3000 F

welder19

[saintjohnbarleycorn]

where do you get the borax powder?

[Ice Czar]

generally the supermarket
20 mule team borax, with the detergents and the bleaches
very popular laundry additive and household cleanser, if one supermaket chain doesnt have it try another