Eastman CAB-381-0.5 is a cellulose acetate butyrate (CAB) commonly used as a film-forming resin, resin modifier, and additive in many different coating and ink applications. It is supplied as a free-flowing powder. CAB-381-0.5 has a relatively low molecular weight compared to other Eastman CAB products and is, therefore, ideal for applications that demand low viscosity and high-solids content. It provides pigment dispersion, weathering resistance, and excellent control over color, flexibility, and flow. CAB-381-0.5 is compatible with many resins and is soluble in low-cost solvent systems.

CAB-381-0.5 improves wetting, UV stability, and drying times in inks and overprint varnishes. Improved metal flake orientation, resistance to redissolve from the topcoat solvents, and excellent sprayability are key benefits of cellulose acetate butyrate in coatings. CAB-381-0.5 is also commonly used in nail coatings to increase flexibility and improve UV resistance over other additives like nitrocellulose. It also is much safer to use than nitrocellulose because cellulose esters are much less flammable. Nail polish formulated with CAB-381-0.5 features fast cure speeds due to the fast solvent release of the film-forming polymer.