VII. Rubber.—Because of its toughness, elasticity, and resistance to alterative influences, rubber is a very useful constituent in lutes, but its price makes its use very limited.
Leather Cement.
| 1. | Asphalt | 1 part |
|---|---|---|
| Rosin | 1 part | |
| Gutta percha | 4 parts | |
| Carbon disulphide | 20 parts |
To stand acid vapors:
| 2. | Rubber | 1 part |
|---|---|---|
| Linseed oil | 3 parts | |
| Fire clay | 3 parts |
3. Plain Rubber Cement.—Cut the crude rubber in small pieces and then add the solvent. Carbon disulphide is the best, benzol good and much cheaper, but gasoline is probably most extensively used because of its cheapness.
4. To make corks and wood impervious to steam and water, soak them in a rubber solution as above; if it is desired to protect them from oil vapors, use glue composition. (See Section IX.)
VIII. Linseed Oil.—This is one of the most generally useful substances we have for luting purposes, if absorbed by a porous substance that is inert.
Formulas: 1. China clay of general utility for aqueous vapors.
Linseed oil of general utility for aqueous vapors.