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Technical questions and service

What are the benefits of composite materials?
  • Low specific weight
  • High tenacity and specific stiffness
  • Very low coefficient of expansion
  • High degree of chemical resistance
  • No corrosion
  • Weather and water resistant
  • Good insulating properties
  • Longer durability
  • Lower service standstill
  • Less wear of propulsion engines, axles and bearings
  • Higher output from your mechanical production than with aluminium or stainless steel parts
  • Higher measurement accuracy due to a very low expansion coefficient

Are there downsides to composites?
Depending on your requirements and uses there can also be downsides to using composite materials. For instance, they cannot withstand sharp point-concentrated loads well and composite can splinter when broken. The post-processing stage can also be labour-intensive and expensive (CNC milling).
If you require tolerances lower than +/- 0.2 mm, post-processing is always necessary and more expensive than for conventional materials like steel or aluminium.

What (safety) measures do I need to take when post-processing composite?
Post-processing composite is a speciality. We advise that you let the Carbonwebshop take care of finishing. If you want to do it yourself, then take these points into account:

  • If working with composite, always work in a space with a good ventilation system. Sawing, drilling and milling can release miniscule dust particles.
  • Always wear personal protective equipment, such as: a dust mask, eye protection and ear protection, as well as protective clothing.
  • Use sharp and high-quality cutting tools.
  • Be patient and careful with all post-processing work, otherwise the composite can get damaged and delaminate (tear between the layers).

Looking for advice or help with post-processing? Please contact us so we can assist you.

What should I keep in mind when bonding composite?
  1. When bonding composite, make sure that you first clean and degrease it properly.
  2. Then sand down the parts to be bonded. Make sure to only sand the surfaces that will be bound, or the top layer of composite will be damaged during sanding, which eliminates the nice gloss.
  3. After that, degrease the surface again with a clean cloth.
  4. Finally, apply the glue to the surface and place the composite parts against each other. If needed, use grips or glue moulds

Can I also glue metals onto composite?
This is possible with the araldite 2031 glue that is available at the carbonwebshop. Follow the aforementioned steps for gluing on an insert.

Can I drill holes in carbon parts?
It is certainly possible, but keep in mind the aforementioned safety measures.

Can I mill carbon products?
The Carbonwebshop can give you a quote for CNC milling work.

What is the difference between ‘laminated’, ‘roll wrapped’ and ‘pultruded’ tubes?
  • The three types have different fibre orientations, which affects flexibility and torsion. The main reason for this is that each type has a different production process. Deciding which type of carbon tube is most suitable for you depends on what you need it for. Carbonwebshop only sells laminated and pultruded tubes. We are happy to advise you on which one will best suit your needs.
  • - A laminated tube is made from prepreg tissues that are laminated around a mould. The fibre orientation for the Carbonwebshop’s tubes is there for about 80% lengthwise and 20% crosswise.
  • - For roll-wrapped tubes, dry fibres are first pulled through a resin bath, and then through a guide mechanism to be shaped. At the same time, a minimal rotary wrap is placed around the tube, which allows the tube to absorb a small amount of torsion. The fibre orientation is about 95% lengthwise and 5% crosswise.
  • - Pultruded tubes have a fibre orientation that is 100% lengthwise (axial). These fibres are also pulled through a guide mechanism and a resin bath. The tubes’ rigidity is only lengthwise because it has no crosswise fibres, which means that a pultruded tube cannot withstand any torsional load.

What does the abbreviation ‘El’ stand for?
‘El’ refers to the elastic modulus of carbon fibre products with a certain lamination, multiplied by the surface tension. This gives the object with the shape in question its stiffness. The elastic modulus is the number we use to indicate the resistance to elastic (non-permanent) deformation when the object is loaded. The surface tension says something about the bending resistance in a certain direction.

What is a prepreg?
Prepreg stands for pre-impregnated, which means that the fibres have already been impregnated with the correct amount of resin. This material method provides components with a relatively high fibre content.

Can I get CAD files for your existing products?
Yes, that is possible. You can request CAD files at

What does hand laminating a tube or square tube entail?
It means hand applying different carbon layers to a mould. The majority of the Carbonwebshop’s products are made with prepreg. The advantage is that the fibres lie in different directions and products have a higher fibre volume fraction (+65%).


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