Item

value

Fused silica (SiO₂)

> 99.7%

Cristobalite

< 2%

Bulk density (g/cm³)

1.92 1.99

Apparent porosity (%)

6 - 12

Service temperature (°C)

Up to 1,200

Thermal expansion coefficient (×10^-6 /°C)*

≤ 0.6

Thermal conductivity (W/m°C)*

< 0.65

Thermal shock resistance (25 1200°C) 

Very good

Bending strength (room temperature) (MPa)

≥ 25

Bending strength (1100°C, 0.5 hour) (MPa)

≥ 28

Compressive strength (room temperature) (MPa)

≥ 60

Tolerance in diameter (mm)*

± 0.05

T.I.R. over full length: (mm)*

< 0.12

Surface roughness (μm)*

< 1.6