Introduction
Electric fused opaque quartz glass has low transmission, high heat reflectivity, which can effectively reduce heat loss and can extend the lifespan of heating parts. The material can be welded, fire-polished, and high-precision optical polished, featuring high density, excellent machining finish, good surface finish after firing, and longer service life. Suitable for semiconductor heat treatment processes.
Physical Property
Density（g/cm³ ）
Porosity
Pore size
Expansion coefficient（ 0-900℃）10-6 ℃ -1
SSpecific Heat（20℃）
Max. working temperature-continuous℃
Max. working temperature-short term ℃
Dielectric loss (room temperature)
Thermal Conductivity（20℃）
2.18~2.19
＜0.5%
＜10 μm
0.45
0.75
1100
1300
2×10-4
1.39
Chemical purity
Impurity Typical Value (ppm)
Al
12.29
Ca
1.05
Mg
0.03
Cu
0.0
Fe
0.53
Ni
0.01
Mn
0.00
Li
0.30
K
0.47
Na
0.98
Zr
1.64
Ti
1.42
B
0.00
Co
0.00
sum
18.72
Optical Properties
Transmission（400-2000nm）
Reflectivity（400-2200nm）
>0.5%
>60%
Fig. a Transmittance of FSTQZ®W
Fig.b Reflectivity of FSTQZ®W
Electric Fused Opaque Quartz
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