Basalt fibre

Basalt fibres are produced by melt spinning a mass of molten basalt heated to a temperature of 1400 °C. The diameters of the filaments obtained in this way are generally between 10–20 μm. Mainly used in fibre/plastic composites, basalt fibres are also used in areas such as filtration, horticulture and concrete reinforcement. To achieve better bonding to the plastic matrix in the field of fibre-reinforced materials, basalt fibres are often finished with a silane sizing.

Pros and cons
Basalt fibre Properties


  • High tensile strength (higher than glass fibres)
  • Exceptional temperature resistance
  • Non-flammable
  • UV-stable
  • Natural product
  • High corrosion resistance
  • Low moisture absorption


  • High density (specific gravity)
  • Not electrically conductive

Basalt fibre
Manufacturing process

After the raw basalt has been crushed and cleaned, it is melted at 1450 °C and, after pressing, drawn through nozzle holes into filaments with a diameter of 10–20 µm. The filaments are also finished with a silane sizing agent for better matrix adhesion. In the next process, the filaments are spun into yarn, combined into a roving or processed into short-cut fibres.

Basalt fibre Programme

Fibre Filler



Short Cut



Order our Basalt fibre Sample box

Contact our fibre experts and discover our extensive STW sample box with numerous raw material samples, personally tailored to your needs and requirements.

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technology and
quality of the fibre

State-of-the-art laboratory facilities, quality management according to ISO 9001:2015, energy management according to ISO 50001:2018 and last but not least the high demands on our own work ensure the high quality standards of our Basalt fibre. See for yourself.

If you want to know more about the technology and quality of our Basalt fibre If you want to know, just get in touch with us. We would be happy to advise you comprehensively and help you with our know-how.

You are looking for the perfect Basalt fibre for your application or have an exact requirement profile, which the used Basalt fibre must fulfill?

Then you are exactly right, as a technology leader in the field of fibre development and production, we offer you individual solutions and manufacturing processes that ensure constant and reproducible fibre quality.



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