I expect there are better formulations for refractory but his one is all easy to get stuff. The original formulation calls for fire clay but the Delft site says "or drillers mud" which is bentonite.
This is a corrected table. I originally stated quarts but had used pints.
A pint is one part
1.5 parts Portland cement 1.8 lb
2.0 parts play sand 3.4
1.5 parts perlite 0.13 lb
2.0 parts western bentonite clay 2.0 lb
Total 7 pints and it weights 7.3 lb
Image of same
Combined first 3 ingredients in a 5 gallon pail and tumbled for 15 minutes by wedging the pail and a foam rubber cushion into the HF concrete mixer.
Now to guess at the size of a form required. The mix is 7 pints or approximately 200 cubic inches. Made a form a 2.5" x 10" x 13.75" form with a moveable bar.. Full without the bar it is 344 cubic inches.
The actual mix filled 6 inches of the form. 10 x 6 x 2.5 =150 CI
Also found Depression-Refractory-Mix-For-The-Backyard-Foundry which uses sodium silicate grog and fire clay.
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