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      Carbon fibre (CFRP)

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      • Pultruded carbon fibre (CRP) rod, round
        6 Variants
        Pultruded carbon fibre (CRP) rod, round
        from 7,90 €
        opaque, satin finish, 65% fibre content, carbon fibre Tenax HT 24 K, matrix material is epoxy vinyl, pultruded, tensile strength 900 N/mm², modus of elasticity >90.000 MPa, temperature resistant (long term) up to...
      • Carbon fibre plastic (CRP), round tube,pultr.
        6 Variants
        Carbon fibre plastic (CRP), round tube,pultr.
        from 7,90 €
        opaque, glossy, 65% fibre content, carbon fibre Tenax STS 24 K, matrix material is epoxy vinyl, pultruded, tensile strength 1700 N/mm², modus of elasticity 115.000 N/mm², temperature resistant (long term) up to 115...

      Properties and production of CFRP materials

      CFRP, carbon fibre, carbon fibre reinforced plastic, carbon fibre, carbon fibre, carbon fibre reinforced plastic (hence the abbreviation CFRP) - all these terms refer to the same material: a composite of carbon fibres, which are embedded in a matrix in the form of threads parallel to each other, crosswise as a fabric or as a well-ordered textile fabric. The matrix is a castable, duroplastic plastic, mostly epoxy resin or polyester.

      Carbon-fiber-reinforced plastics have special physical properties, especially exceptional strength and stiffness - it is indeed surprising to hold a three-millimeter-thick rod in your hands and not bend it as you would expect. The material is particularly light, has very good vibration damping and low material fatigue, even under permanent dynamic load. It can be said that CFRP is significantly lighter than aluminium, but at least as strong as steel in terms of strength. Further advantages are low thermal expansion and good corrosion resistance.

      During production, the fine carbon fibres are bundled into individual, thicker rovings. These are further processed depending on the field of application: For example, they are cut into small pieces and used for laminating. Single- or multi-directional scrims and fibre mats are also used for this purpose, in which the fibres are arranged either strictly in one direction or crosswise. The most stable form, however, is further processing into textile fabrics in which the structure of the braid can be precisely matched to the way the component will be subjected to the load it will be subjected to. The highest strengths are always achieved in the direction of the fibres - so it is obvious that a fabric structure in which the fibres run in different directions is more stable than a unidirectional fabric.

      Semi-finished products made of CFRP are essentially produced in three different processes:

      • Pultrusion: Here rovings are impregnated with a resin (polyester or epoxy - epoxy is more stable, but also more expensive) and pulled through an extrusion die in strands, thereby formed and cured. The rovings or carbon fibres are aligned unidirectionally, the semi-finished product particularly stable in the corresponding direction.
      • Filament winding: Rovings are soaked in resin and wound onto rotating cores at variable angles. Depending on the thickness of the roving and the layer thicknesses applied, different qualities and strengths are produced.
      • Prepreg: the visible textile structure that is typically associated with carbon (and often imitated as an adhesive film) is created by wrapping resin-impregnated fabric mats, so-called prepregs, around metal mandrels. In this process, too, the layer structure can be adapted to the material and the fiber angle changed depending on the requirements. Prepregs have the highest strength, but are also quite expensive.

      A high fibre content is desirable - this is usually between 50 and 80 percent - 60 percent fibre content can be regarded as a solid standard value.

      Areas of application for CFRP materials

      The future belongs to carbon! This statement may be a bit flat and bold, but the areas of application are still increasing. CFRP is mainly used for rigid constructions:

      • Highly loadable machine components with particularly good vibration resistance, stable housing parts
      • Sail battens, tennis rackets (also due to the vibration resistance of the material, the tennis arm is no longer as widespread as it was in the 70s), kite and tent poles, frame parts and seat posts of bicycles
      • Flag and telescopic poles, pointer rods

      More generally, the most common application is as a stable tube, profile or rod, which is extremely stable with small diameter and weight.

      Processing of CFRP materials

      CFRP parts can be sawn with a hacksaw or a circular saw; the problem is that the fibres fray a little at the ends and post-processing does not significantly improve the interface. A band saw with diamond-studded band saw blade is ideal. Alternatively, a fine boring grinder with (diamond-coated) cutting disc is recommended.

      CFRP can be drilled with a conventional carbide drill (at rather low speeds), but diamond-studded tools are better. The drill holes will fray less if you drill into a soft surface (wood, plastic).

      The material is best bonded with a two-component epoxy-based adhesive. With pipe or rod extensions, however, an (additional) internal or external mechanical connection in the form of a sleeve or connecting piece is generally better.

      CFRP semi-finished products are easy to paint, but it should be noted that they often have a release agent film on the outside. So, as is generally the case, first sand and clean, then varnish.

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