Carbon fibers have been used to be produced as commercial materials thanks to their specific usage areas and their 40 years development course. Properties of carbon fibers which are produced polyacrylonitryl fiber, cellulosic materials, tar and pitch materials, polyvinylidene chloride or polyvinylidene chloride copolymer have depended on raw-materials and processes conditions.
Key Words: Carbon fiber, mesophase, carbon fiber usage