Carbon fibres made from rayon (cellulose) precursor fibres.
Rayon-based carbon fibres have a more @I03353@ structure than similarly heat-treated polyacrylonitrile (PAN)- or @M03851@. Their @M03966@ values are therefore drastically lower (100 GPa; tensile strength 100 MPa). Rayon-based carbon fibres can be transformed into anisotropic carbon fibres with high strength and @M03966@ values by hot-stretching treatment at temperatures of approximately 2800 K.
PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 503 (https://doi.org/10.1351/pac199567030473)