Boost Adhesion, Reduce Powder‑Fall‑Off Cost‑Effective CMC CMC for putty is an anionic, water-soluble cellulose, a white fibrous powder, soluble in cold water, and a core functional additive for interior wall dry powder putty.Core Functions: Water retention, thickening and lubrication, suspension stabilization, and improved adhesion.After the putty is mixed with water, CMC dissolves to form a colloidal network, locking in the moisture of the slurry and preventing rapid water