(1) Construction industry: As a water-retaining agent and retarder of cement mortar, it makes the mortar pumpable. Use plaster, gypsum, putty powder or other building materials as adhesives to improve the applicability and prolong the operation time. It can be used to paste ceramic tile, marble, plastic decoration, paste reinforcing agent, and reduce the amount of cement. The water-retaining property of HPMC prevents the slurry from cracking due to drying too fast after smearing and enhances the strength.