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Gypsum retarder is a chemical additive widely used in the production process of gypsum products. It has an appearance similar to white powder. 

Its main function is to reduce the hydration speed and heat of hydration of gypsum, prolong the hydration time of gypsum from hemihydrate gypsum to dihydrate gypsum, thereby prolonging the setting time of gypsum and improving the quality and performance of gypsum products.

The amount of gypsum retarder added is small, and the retarding effect is good. It not only plays the role of high strength and high retarding, but also does not affect the strength of gypsum, providing convenient conditions for construction.