Item: Value
Fused silica (SiO2) *: > 99.7%
Cristoballite: < 2%
Bulk density (g/cm3): 1.92 to 1.99
Apparent porosity (%): 6 to 12
Service temperature (C): Up to 1, 200
Thermal expansion coefficient (10-6 /C)*: ≤ 0.6
Thermal conductivity (W/mC)*: < 0.65
Thermal shock resistance (25to1200C): Very good
Bending strength (room temperature) (MPa): ≥ 25
Bending strength (1100C, 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 (¦Ìm)*: < 1.6