Hydroxypropyl methylcellulose(HPMC) is a type of nonionic cellulose ether made from natural high molecular materials through a series of chemical processes. With almost all properties of methyl cellulose (MC), it is the auxiliary agent of first choice in the production of top-quality construction materials. it is applicable to the production of innovative construction materials like dry-powder mortar, waterproof putty powder (paste) for indoor and outdoor walls, binding agent, gap filler, interface finishing agent, water paint, self-leveling agent, etc. In the production of construction materials, cellulose ether is an indispensable additive.