Cellulose derivatives are among the most effective water retainers, stabilisers and thickeners. Based on natural cellulose, treated chemically, these products retain water, thus extending the end product’s humidity. This is desired in construction materials such as mortars, gypsum plaster, tile cements, etc. By adding cellulose derivatives like HPMC, HEMC, HEC etc., construction materials are given longer open times and better workability, thus giving operators more time for processing. Furthermore, viscosities are increased, a requirement in many cases. In the pharmaceutical industry, where special grades from dedicated plants are used, these products allow a controlled release of active ingredients which is a very welcome property in many types of drugs.