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How is it made? The raw material used to make carbon fiber is called the precursor. About 90% of the carbon fibers produced are made from polyacrylonitrile (PAN). The remaining 10% are made from rayon or petroleum pitch. All of these materials are organic polymers, characterized by long strings of molecules bound together by carbon atoms.
Almost all carbon fiber is made from a common industrial fiber called polyacrylanitrile fiber, also known as PAN. Most PAN fiber is used to make acrylic fiber. It is also used to make carbon fiber with a pyrolizing process, which means it is heated to ultra high temperatures to remove all elements except the carbon.Most carbon fiber is sold at this point and it has a tensile modulus of 33 million pounds per square inch (MSI).(Tensile modulus is a measurement of stiffness.) This 33 MSI fiber, if seen up close, looks like a a redwood tree trunk, with deep fissured bark.ost carbon fiber is sold at this point and it has a tensile modulus of 33 million pounds per square inch (MSI). (Tensile modulus is a measurement of stiffness.) This 33 MSI fiber, if seen up close, looks like a a redwood tree trunk, with deep fissured bark.