Hydroxypropyl starch ether is an ionic starch ether generated from cassava starch. It is soluble in cold water and has good water solubility. In industrial field, it has properties such as thickening, bonding, dispersing, emulsifying, suspending, adsorbing, surface activity, and water retention.

Hydroxypropyl starch ether has extensive applications in the building materials industry, with large consumption volumes, serving as a retarder, water-retention agent, thickener, and binder. It plays a crucial role in various materials such as ordinary dry-mixed mortars, high-performance exterior thermal insulation mortars, self-leveling mortars, dry powder finishing adhesives, tile adhesive dry mortars, high-performance construction putties, crack-resistant interior and exterior wall putties, waterproof dry-mixed mortars, gypsum plasters, scraping and whitening agents, and thin-layer joints, significantly influencing the water retention, strength, setting time, and workability of plaster systems.