Miscellaneous Formulas For Fireproofing.
I.—In coating steel or other furnaces, first brush over the brickwork to be covered a solution made by boiling 1 pound each of silicate of soda and alum in 4 gallons of water, and follow immediately with composition:
| Silica | 50 parts |
| Plastic fire clay | 10 parts |
| Ball clay | 3 parts |
Mix well.
Fireproof Compositions.—II.—For furnaces, etc.:
| Pure silica (in grain) | 60 parts |
| Ground flint | 8 parts |
| Plaster of Paris | 3 parts |
| Ball clay | 3 parts |
Mix well together by passing once or more through a fine sieve, and use in the same way as cement.
Fireproof Paper.—Paper is rendered fireproof by saturating it with a solution of
| Ammonium sulphate | 8 parts |
| Boracic acid | 3 parts |
| Borax | 2 parts |
| Water | 100 parts |
For the same purpose sodium tungstate may also be employed.