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Properties                                               SI Units         Basalt Filaments         Fiberglass                   Silica

Filament

Thermal  

Maximum application temperature             (°C)                       982°                           650°                        1100°

Sustained operating temperature               (°C)                       820°                           480°                        1000°

Minimum operating temperature                (°C)                      -260°                           -60                          -170°

Thermal conductivity                                (W/m K)             0.031 -0.038                0.034-0.04              0.035-0.04

Melting temperature                                   (°C)                      1450°                         1120°                       1550°

Virtification conductivity                              (°C)                       1050°                         600°                   1300°-1670°

Glow loss                                                    (%)                        1.91                           0.32                         1.75

Thermal expansion coefficient                (ppm/ °C)                   8.0°                           5.4°                         0.05°

 

Physical/Mechanical 

Density                                                     (g/cm3)                   2.75                             2.6                          2.15

Filament diameter                                   (microns)                 9-23                            9-13                         9-15

Tensile strength                                         (M Pa)                   4840                           3450                        4750

Compression                                               (psi)                  550,000                     440,000                    510,000

Elastic modulus                                          (G Pa)                    89                               77                             66

Linear expansion coefficient                      (x10 /K)                  5.5                               5                              0.5

Elongation at break                                      (%)                     3.15                            4.7                            1.2

Absorbtion of humidity  (65%RAH)               (%)                    <0.1                           <0.1                          <0.1

Stability at tension (20 C°)                            (%)                     100                            100                           100

Stability at tension (200 C°)                          (%)                      95                               92                             94

Stability at tension (400 C°)                          (%)                      82                               52                             80

 

Acoustics:

Sound absorbtion coefficient                         (%)                   0.9-0.99                     0.8-0.93                 0.85-0.95

 

Electrical:

Specific volume resistance                         (ohm.m)            1*10x12                     1*10x11                    1*10x11

Loss angle tangent frequency                    (1 MHz)               0.005                        0.0047                      0.0049

Relative dielectric permiability                    (1 MHz)                 2.2                              2.3                           2.3

 

Chemical Resistance 

% weight loss after 3 hrs boiling in:

H2O                                                              (%)                     0.2                               0.7                          0.05

2n NaOH (Sodium Hydroxide)                      (%)                     5.0                               6.0                           5.0

2n HCI (Hydrochloric acid)                            (%)                     2.2                             38.9                         15.7

Price Comparison                                                                      $                                 $                          $$$$