Cellulose Acetate Butyrate, CAB 381-0.5 is a cellulose ester with medium butyryl content and low viscosity. It was designed for use where low-application viscosities at relatively high solid levels is needed. It is soluble in a wide range of solvents and compatible with many other resins. It will also tolerate the use of solvent blends currently exempt from certain air pollution regulations. It is supplied as a dry, free-flowing powder.