HEC (Hydroxyethyl Cellulose) is mainly used as a primary thickener in water-based paints and coatings. It increases viscosity and provides shear-thinning behavior, which helps prevent pigment settling and sagging while maintaining good brush and roller application properties. Because of its high thickening efficiency and good compatibility with latex systems, HEC is widely used in architectural coatings.
HPMC (Hydroxypropyl Methylcellulose) is typically used as a secondary thickener and performance modifier. It improves water retention, leveling, and reduces roller spatter, leading to better film formation and surface finish. HPMC is often used in textured coatings and putty systems, and is sometimes combined with HEC to achieve a balance between viscosity control and application performance.
