Properties

Unit

Basalt fiber

Glass fiber

Silica fiber

Color

-----

Brown

transparent White

White

Max application temp.

C

982

650

1100

Sustained operation temp.

C

820

480

1000

Min operation temp.

C

-260

-60

-170

Thermal conductivity

W/m K

0.031 ~ 0.038

0.034 ~ 0.04

0.035 ~ 0.04

Melting temp.

C

1450

1120

1550

Vitrification temp.

C

1050

600

1300 ~ 1670

Glow loss

%

1.91

0.32

1.75

Thermal expansion coeff.

ppm/C

8.0

5.4

0.05

Density

g/cm3

2.75

2.6

2.15

Filament diameter

microns

9 ~ 23

9 ~ 13

9 ~ 15

Tensile strength

Mpa

4840

3450

4750

Compression

KSI

550

440

510

Elastic Modulus

Gpa

89

77

66

Linear expansion coeff.

x 10 /K

5.5

5

0.5

Elongation at break

%

3.15

4.7

1.2

Absorption of humidty

%

< 0.1

< 0.1

< 0.1

Stability at tension

20C,%
200C,%
400C,%

100
95
82

100
92
52

100
94
80

Sound absorption coeff.

%

0.9 ~ 0.99

0.8 ~ 0.93

0.85 ~ 0.95

Specific volume rsist.

ohm.m

1E12

1E11

1E11

Loss angle frequency

1 MHz

0.005

0.0047

0.0049

Relative dielectric permeability

1 MHz

2.2

2.3

2.3

% weight loss after 3 hours boiling in

H2O
2n(NaOH)
2n(HCl)

0.2
5.0
1.8

0.7
6.0
38.9

0.05
5.0
15.7