Effects: Hydroxypropyl methyl celluloses (HPMC) are a nonionic cellulose ether, which is an etherified product of cellulose. They have the properties, such as water solubility, water-retaining property, nonionic type, pH stability, surface activity, temperature invertibility gelatinization type, tackification, cementation, film-forming, lubrication, antienzyme, and so on. In the process of building construction, they can improve the cementation strength and workability of dry-mixed mortar, and reduce the use of cement. Hydroxypropyl methyl celluloses (HPMC) can be used in polyphenyl granule moisture retention mortar, glass bead thermal insulation mortar, ceramic tile adhesive, thermal insulation mortar and putty powder. They work as water retention thickener, etc.