Which one of the following is not used as a raw material in the manufa

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Which one of the following is not used as a raw material in the manufacture of glass ?

Soda
Alumina
Borax
Gypsum
This question was previously asked in
UPSC NDA-1 – 2021
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Gypsum is not typically used as a primary raw material in the manufacture of standard glass.
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.
Minor components might be added to glass batches as fining agents (to remove bubbles), colorants, or flux enhancers, but gypsum is not a standard ingredient for bulk glass manufacturing.

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