ROTWILD carbon frames are mainly produced from what are known as HT fibres (HT = High Tenacity). The modular structure of the frame enables us to use other carbon fibre types (HM = High Modulus or HST = High Strain and Tenacity) in addition to HT fibres. This makes it possible to deal with special problems such as higher stiffnesses (HM) or to selectively improve the mechanical behaviour of the frame in response to chip damage or impacts (HST).
Prepregs provide the starting material for frame production. These are semi-finished fibre products in which the individual carbon fibres, some with a thickness of only 0.007 mm, have already been preimpregnated with epoxy resin (matrix). The quality of this preimpregnation is crucial in defining the subsequent characteristics of the carbon frame. Only if there is a constant distribution and the correct volume ratio of fibre to resin will it be possible to achieve an ideal power-to-weight ratio for the frame. If, for example, in order to save weight, the resin content is reduced in the prepreg or minimized during processing, this may mean that the fibres are no longer ideally embedded in the resin and are unable to transmit forces – particular under compressive loading.