Basalt Fiber Properties

Mechanical properties

Basalt fiber are similar to glass fibers regarding with specific weight of 2,6g/m3, however are characterized by 20% higher mechanical properties such as tensile and compressive strength, rigidity, E-Modulus and excellent resistance to chemical environment. Basalt fibers provide 10% higher absorption of electromagnetic radiation and absorption of forces. Additionally basalt fiber distinguish in excellent resistance to UV radiation, corrosion and organic effects.

A lower thermal expansion coefficient and higher operating temperature than by glass fibers allow usage of basalt fibers in innovative sandwich constructions with carbon fiber especially by manufacturing of heating molds. Under influence of high temperature arise no delaminations of single layers so that these sandwich-construction are more stably and durable.

Basalt fibers and basalt fiber products provide also very good opportunity for a significant reduction of the non-recyclable materials and allow to reduce the recycling costs. As a result of LCA-Assessment the basalt fibers show the significant better results as glass or carbon fibers.

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National Directives on end-of life vehicles strongly recommend to car manufacturers to use end-of-life management principles during car development and production. To fulfill such recommendations, car manufactures have to look for new “green” materials which could help them to meet environmental requirements and to ensure maximum recycling when the vehicles reach end-of-life stage.

 

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

Tensile strength change by the heating

Temperature Tensile strength change
+20°C 100%
+200°C 95%
+400°C 80%

 

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

 

  Thermal load duration                               
Permanent From -260 up to +400 °C
(1) Stage 1: amorphous fiber with sizing on the fiber surface Up to +200 °C
(2) Stage 2: burning of sizing (10-15 minutes), amorphous fiber From +200 up to +350 °C
(3) Stage 3: amorphous fiber without sizing on the fiber surface Von +350 bis zu +400°C
Short term (few minutes) From +400 up to +850 °C
(4) Stage 4: transition of FeO into Fe2O3 and beginning of crystallization of Fe2O3. The fiber is becoming less and less amorphous and more and more brittle From +400 up to +850 °C
Short term (few seconds) From +850 up to +1250 °C
(5) Stage 5: all the Fe2O3 is in crystal form, the material is extremely brittle, its mechanical properties are extremely poor but without stress and vibration it continues working as thermo insulation pretty good From +850 up to +1050 °C
(6) Stage 6: sintering temperature From +1050 up to +1250 °C

 

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% 14% and 22%

 

 

 

 

 

Comparison of mechanical properties

Properties Continuous Basalt E-Glass S-Glass Carbon Aramid
Density (g/cm³) 2.6- 2.8 2.5 – 2.6 2.5 1.8 1.5
Tensile Strength (MPa) 4100 – 4840 3100 – 3800 4020 – 4650 3500 – 6000 2900 – 3400
Elastic Modulus (GPa) 93.1 – 110 72.5 – 75.5 83 – 86 230 – 600 70 – 140
Elongation at break 3.1 4.7 5.3 1.5 – 2.0 2.8 – 3.6
Maximum Service Temperature °C 600 380 300 500 250

 

Tensile strength of basalt fiber fabrics

Test Conditions
Resin: L20 Harder: EPH 161 Temperature:20°C

 

Fabric Grammage Layers Thickness Alignment Tensile Strength E-Modulus Elongation
Plain 150 g/m2 1 0,17 mm 250 MPa 12200 MPa 1,7 %
Plain 150 g/m2 1 0,17 mm 45° 160 MPa 361 MPa 21 %
Twill 200 g/m2 1 0,20 mm 430 MPa 12500 MPa 2,7 %
Twill 220 g/m2 1 0,15 mm 315 MPa 15000 MPa 1,8 %
Twill 160 g/m2 1 0,15 mm 290 MPa 15500 MPa 2 %
Twill 160 g/m2 1 0,15 mm 45° 95 MPa 1724 MPa 15 %

SIC – Test

The tests of rovings aging resistance in a concrete matrix were carried out in accordance with DIN EN ISO 2062 and DIN EN 14649 (SIC). The results show that our basalt fiber rovings BR130.2400.12RAA, BR170.240013RAA and BR170.240042RAA are in the top group and reach almost even after aging the values ​​of alkali-resistant glass fibers.

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For more information please contact info@incotelogy.de

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