Index

Component

SiO2(Wt)

≥99.8％

Al2O3

≤0.12％

Fe2O3

≤0.02％

TiO2

≤0.018％

MgO

≤0.004％

Na2O

≤0.004％

CaO

≤0.007％

K2O

≤0.004％

Physical property

Bulk density

≥1.90-1.95g/cm³

Porosity

≤15％

Compressive strength at normal temperature

≥50MPa

Bending strength

(Room temperature)

≥25MPa

Bending strength

At high temperature

≥28MPa

Degree of crystallinity

<1％

Thermal shock resistance per

time (1100C-downquenching )

≥10（times）

Thermal property

Thermal conductivity

20C:0.64W/m°K

500C:0.81W/m°K

1090C:0.88W/m°K

Coefficient of thermal expansion （C^-1）（RT~1100C）

≤0.9×10⁶

The max operating temperature（C）

1650