Hydroxypropyl methylcellulose serves as a water retaining agent and retardant for cement mortar to make the mortar pumpable. Used as a binder in plaster, gypsum, putty powder or other building materials to improve spreadability and extend operating time. Used as a pasting tile, marble, plastic decoration, pasting enhancer, and can also reduce the amount of cement. The water-retaining properties of HPMC prevent the slurry from cracking due to drying too quickly after application, and enhances the strength after hardening.