In composite laminates, carbon fibre is a high-grade way of increasing the stiffness and strength of the component and of reducing its weight. Equally more and more use is being made of its electrical and heat transfer properties. Carbon fibres are classified into three groups, according to their mechanical properties:
HT – high tenacity
IM – intermediate modulus
HM – high modulus
They are further characterised by the number of filaments (1K= 1000 filaments, 3K, 6K, 12K, 24K etc.), the filament diameter, the precursor and the size applied. Carbon fibres consist of approx. 96 % pure carbon.