They are floor construction chemicals used to eliminate surface defects and unwanted roughness. It is plaster based, self-leveling. It can be applied in 2 – 20 mm thickness. It is used in indoor and dry environments such as residences, hospitals, educational buildings, schools, shopping malls, stores and markets. It is suitable for leveling the surface with a thickness of 2 – 20 mm before laying ceramic, granite, marble, wood, parquet, laminate, carpet, PVC and linoleum coatings. It can be used on flooring concrete, ceramics, tiles. Gypsum-based products dry quickly. It is applied faster and easier than cement mortars. It does not form shrinkage cracks on the surface. It can be walked on 12 hours after the application is completed. It has high bending and compressive strength. After curing, the surface hardness and wear resistance are high. It spreads by itself and comes to the scale, eliminating the roughness of the subfloor. It releases much less carbon than cement-based screeds and does not require irrigation after application. Suitable for underfloor heating systems. It is applied by machine. It can be applied over old concrete floors.