Which one of the following is not used as a raw material in the manufacture of glass ?
Soda
Alumina
Borax
Gypsum
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC NDA-1 – 2021
The main raw materials for manufacturing common soda-lime glass are silica (sand), soda ash (sodium carbonate), and limestone (calcium carbonate). Alumina and borax are used in the production of specialized glasses like aluminosilicate glass and borosilicate glass, respectively. Gypsum (calcium sulfate) is primarily used in plaster, drywall, and cement production.