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Introduction of Quartz Fiber:

Tensile strength 7GPa, tensile modulus 70GPa, the SiO2 purity of quartz fiber is more that 99.95%, with density of 2.2g / cm3.  

It is flexible inorganic fiber material with low dielectric constant and the high temperature resistance. Quartz fiber yarn has unique advantages in the field of ultra-high temperature and aerospace, it is a good substitute for E-glass, high silica, and basalt fiber, a partially substitute for aramid and carbon fiber. In addition, its linear expansion coefficient is small, and elastic modulus increases when temperature increasing, which is extremly rare.

 

Analysis of chemical composition of quartz fiber

SiO2

Al

B

Ca

Cr

Cu

Fe

K

Li

Mg

Na

Ti

>99.99%

18

<0.1

0.5

<0.08

<0.03

0.6

0.6

0.7

0.06

0.8

1.4

Performance:

1

1. Dielectric properties: low dielectric constant

Quartz fiber is of excellent dielectric properties, especially stable dielectric properties at high frequencies and high temperatures. The dielectric loss of quartz fiber is only 1/8 that of D-glass At 1MHz. When temperature is lower than 700 ℃, the dielectric constant and dielectric loss of quartz fiber do not change with temperature.

2. Ultra-high temperature resistance, long lifetime at temperature of 1050℃-1200℃, softening temperature 1700 ℃, thermal shock resistance, longer service life   

3. Low thermal conductivity, small thermal expansion coefficient only 0.54X10-6/K, which is a tenth of ordinary glass fiber, both heat-resistant and heat-insulated   

4. High strength, no micro-cracks on the surface, the tensile strength is up to 6000Mpa, which is 5 times that of high silica fiber, 76.47% higher than that of E-glass fiber   

5. Good electrical insulation performance, resistivity 1X1018Ω·cm~1X106Ω·cm at temperature 20 ℃ ~ 1000 ℃. An ideal electrical insulating material  

6. Stable chemical properties, acidic, alkaline, high temperature, cold, stretching durability resistance. Corrosion resistance

Performance

Unit

Value

Physical properties

Density g/cm3 2.2
Hardness Mohs 7
Poisson coefficient   0.16
Ultrasonic propagation velocity Portrait m·s 5960
Horizontal m·s 3770
Intrinsic damping coefficient dB/(m·MHz) 0.08

Electrical performance

10GHz dielectric constant   3.74
10GHz dielectric loss coefficient   0.0002
Dielectric strength V·m-1 ≈7.3×107
Resistivity at 20 ℃ Ω·m 1×1020
Resistivity at 800 ℃ Ω·m 6×108
Resistivity at V1000 ℃ Ω·m 6×108

Thermal performance

Thermal expansion coefficient K-1 0.54×10-6
Specific heat at 20 ℃ J·kg-1·K-1 0.54×10-6
Thermal conductivity at 20 ℃ W·m-1·K-1 1.38
Annealing temperature(log10η=13) 1220
Softening temperature(log10η=7.6) 1700

Optical performance

Refractive index   1.4585

 


May-12-2020