## Wikipedia - Fibra di carbonio carbon fibres type HT

https://doi.org/10.1351/goldbook.C00834
Carbon fibres type HT are @C00831@ with values of @M03966@ between $$150$$ and $$275$$ to $$300\ \text{GPa}$$. The term HT, referring to high tensile strength, was early applied because fibres of this type display the highest tensile strengths.
Note:
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.
Source:
PAC, 1995, 67, 473. (Recommended terminology for the description of carbon as a solid (IUPAC Recommendations 1995)) on page 481 [Terms] [Paper]