Basalt fiber

Basalt

Basalt is a common volcanic rock formed from the rapid cooling of basaltic lava. The percentage content of basalt rock is dependent of deposit location and can include: SiO2 – 52.8%, Al2O3 – 17.5% Fe2O3 – 10.3%, MgO – 4.63%, CaO – 8.59%, Na2O – 3.34%, K2O – 1.46%, TiO2 – 1.38%, P2O5 – 0.28%, MnO – 0.16%, Cr2O3 – 0.06%; whereby the quartz content can come to 20% .

Basalt fiber

The basalt fiber are made in a melting process by temperature 1450°C in a melting furnace. Molten basalt flows from furnace through feeder channel through the platinum-rhodium bushing with 200 to 1000 holes. The fibers are drawn from the melt under hydrostatic pressure. The melt is cooled by cooler and get harden to fibers. Afterwards a sizing is applied to the surface of the fibers by sizing applicator. Sizing improve the fiber elasticity and adhesion with a composites matrix like a resin or concrete. We are providing roving with different monofilament diameter such as 9, 10, 13, 15, 17, 19, 22 µm and linear density 68-1200 tex by Single-End-Roving and 300-9200 tex by assembled Roving.

Properties of basalt fibers

  • High tensile strength
  • High E-Modulus
  • High abrasion strength
  • High temperature resistance
  • High resistance to aggressive media
  • Excellent drapability
  • Very good treatability
  • Excellent thermal and sound insulation
  • Easy to process
  • Excellent ecological tolerance as natural product
  • Easy and reasonable recycling

Mechanical properties

Monofilament diameter, µm 10 13 17
Tensile test according ASTM D-3822(dry fiber), tensile strength, mN/tex ≥ 700 ≥ 650 ≥ 600
Tensile test according ASTM D-2343(in epoxy impregnated strand), tensile strength, MPa 3200 3100 2900
Tensile test according ASTM D-2343(in epoxy impregnated strand), tensile modulus, GPa 90-94 88-92 86-90
Tensile test according ASTM D-2101(Basalt monofilament), tensile strength, MPa 4300 4200 4000
Tensile test according ASTM D-2101(Basalt monofilament), tensile modulus, GPa 95 93 92

 

Thermal operating range

Melting range 1460-1500 °C
Crystallization temperature 1250 °C
Sintering temperature 1050 °C
Thermal conductivity, W/(m • K) 0,031-0,038

Chemical stability

CemFIL Basalt E-Glas
Weightlessness in 3-hour boiling in water 0,2%
Weightlessness in 3-hour boiling in saturated cement solution (pH 12,9) 0,15% 0,35% 4,5%
Weightlessness in 3-hour boiling in 2N solution HCl (hydrochloric acid) 2-7% 38,5%
Weightlessness in 3-hour boiling in 2N solution NaOH (sodium hydroxide) 6%
Weightlessness in 30 minutes and in 180 minutes in H2SO4 (sulfuric acid) 2% and 6% B14% and 22%