The various constituents of glass and their functions are described below:
- Silica:
-
- It is the principal constituent of glass.
- If silica alone is used in the manufacture of glass, it could be fused only at a very high temperature but it would give a good glass on cooling.
- Sodium or potassium carbonate:
-
- It is an alkaline material and forms an essential component of glass.
- It is added in a suitable proportion to reduce the melting point of silica and to impart viscosity to the molten glass.
- Lime:
-
- It is added in the form of chalk.
- It imparts durability to the glass.
- In place of lime, sometimes lead oxide is also added; it makes the glass bright and shining.
| Read More Topics |
| Explain briefly the manufacture of glass |
| Give a brief account of different kinds of glass |
| Describe the manufacture of Portland cement |
