Cement plaster is a mixture of suitable plaster, sand, portland cement, and water, typically applied to masonry interiors and exteriors to achieve a smooth surface, while interior surfaces sometimes get a final layer of gypsum plaster.

SLEO® Cellulose Ether (HPMC/MHEC) are used as thickeners and water retention additives in cement based renders and plasters mortar applications. However, beyond these main functionalities they impact many other performance parameters of cement renders and plasters.