What is gypsum board made up of?

What is gypsum board made up of?
Drywall (also known as plasterboard, wallboard, sheet rock, gyprock, gypsum board, or gypsum panel) is a panel made of calcium sulfate dihydrate (gypsum), with or without additives, typically extruded between thick sheets of facer and backer paper, used in the construction of interior walls and ceilings.

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