The amount of cellulose and noncellulosic constituents in a fiber determine the structure and properties and influence its crystallinity and moisture regain .
Properties such as density, electrical resistivity, tensile strength, modulus, moisture regain and crystallinity are related to the composition and internal structure of the
fibers. Although the strength of fibers cannot be exactly correlated to the cellulose content and microfibrillar angle, generally, fibers with higher cellulose content,
higher degree of polymerization of cellulose and lower microfibrillar angle give better mechanical properties . Fibers with higher lignin content, lower l/d ratio and
higher microfibrillar angle show lower strength and modulus but have higher extensibility. The higher amount of cellulose and the lower spiral angle in banana fibers give the fibers higher modulus and tensile strength but lower breaking elongation compared with coir fibers