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A gypsum retarder is a chemical additive that slows down the hydration process of gypsum plaster. By delaying the setting time, it provides workers with ample time to apply and manipulate the material, especially in larger projects or intricate applications. The use of retarders in gypsum is particularly beneficial in hot and dry conditions, where gypsum might set too quickly, leading to issues such as cracks or improper finishes.