Plaster of Paris Plaster of Paris (POP) is a quick-setting material made by heating gypsum to remove moisture, resulting in a fine white powder that hardens when mixed with water. Known for its smooth finish and versatility, POP is widely used in construction, interior decoration, and artistic applications. It is commonly used for creating false ceilings, decorative moldings, and wall coatings. POP is lightweight, fire-resistant, and provides excellent thermal insulation. Due to its ability to set quickly and form durable structures, it is a preferred material for architects, designers, and builders. It is also used in medical applications for making orthopedic casts and dental molds.