HPMC For Wall Putty/Plaster In building materials, the addition amount of HaoShuo Chemical HPMC is very low, only 0.1%-1%, but it plays an irreplaceable role and can significantly improve the water retention, fluidity and lubricity of building materials. Building materials added with HPMC are easier to mix and use, improve the work efficiency of construction workers, extend the open time, improve the bonding strength, and form a smooth and delicate surface coating. Hydroxypropyl Methyl Cellulose HPMC