Dimethylformamide (DMF) is a clear, colorless, hygroscopic liquid with a slight amine odor. The properties of DMF includes high dielectric constant, the aprotic nature of the solvent, its wide liquid range and low volatility. It is frequently used for chemical reactions and other applications, which require a high solvency power. The high solubility of polyacrylonitrile in DMF, together with the good miscibility of DMF in water makes DMF the preferred solvent for the production of acrylic fibers.