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Continuous basalt fiber [CBF]

Continuous basalt fibers (CBF) are produced from igneous rock in a single process by extruding the basalt melt through the bushing. The resulting filaments are soaked with lubricant and wound onto the bobbins. The content of the chemical elements in basalt rocks suitable for the production of continuous basalt fiber should be within the following range, percentage by weight (wt%):

  • SiO2 – 46-54;
  • Al2O3 – 14-18;
  • TiO2 – 0.2-2.5;
  • Fe2O3 + FO – 7.0-16;
  • K2O – 0.2-4.0
  • CaO – 4.0-12.0;
  • MgO – 2.0-11.0;
  • MnO and SO3, not more than 0.2.

The finished filaments can be 7-25 microns thick and 10 km length. They are used for producing chopped basalt fibers or roving. Further, these materials are used for manufacturing basalt rebar, components for automotive, shipbuilding, wind turbine blades, cylinders, and tanks of high pressure, geogrids, reinforcement for concrete or plastic, production of fabrics and hoses for various purposes.

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Olga Yurchenko

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