00834 IUPAC Gold Book - carbon fibres type HT 10.1351/goldbook.C00834 C00834 current initialism: HT 1 Carbon fibres type HT are carbon fibres with values of Young's modulus between \(150\) and \(275\) to \(300\ \rm{GPa}\). The term HT, referring to high tensile strength, was early applied because fibres of this type display the highest tensile strengths. The disposition of boundaries between the fibre types is somewhat arbitrary. For carbon fibres type HT, the values of the strength-to-stiffness ratio are typically larger than \(1.5 \times 10^{-2}\). The tensile strength of carbon fibres is flaw-controlled, however, and therefore the measured values increase strongly as the diameter of the filaments is decreased. Young's modulus https://goldbook.iupac.org//terms/view/M03966 carbon fibres https://goldbook.iupac.org//terms/view/C00831 PAC, 1995, 67, 473. 'Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)' on page 481 (https://doi.org/10.1351/pac199567030473) https://goldbook.iupac.org/terms/view/C00834/html https://goldbook.iupac.org/terms/view/C00834/json https://goldbook.iupac.org/terms/view/C00834/plain Citation: 'carbon fibres type HT' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.C00834 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-07-14T22:57:50+00:00