Strength classes of carbon fibres:

Designation

Tensile strength
(MPa)

 Tensile modulus
(GPa)

 Elongation at break
(%)

HT

High Tenacity

 3500 - 4500

 230 - 240

 1.8 - 2.0

IM

Intermediate Modulus

 4000 - 5500

 280 - 300

 1.8 - 2.0

HM

High Modulus

 4000 - 4500

 370 - 430

 1.1 - 1.3

UHM

Ultra High Modulus

2600 - 3800 

 > 600

 0.3 - 0.6


Comparables carbon