Fused Silica Brick

SiO₂ ≥ %

97.5

98~99.5

Al₂O₃ ≤ %

0.5

0.1-0.4

Fe₂O₃ ≤ %

0.3

0.01-0.3

CaO ≤ %

0.2

0-0.2

Na₂O+K₂O ≤ %

0.2

0.01-0.2

Apparent porosity %

18.5

13-18.5

Bulk density g/cm³

1.75-1.9

1.85

Cold crushing strength ≥ MPa

30

30-60

1000℃ Thermal expansion coefficient %

0.3

0.01-0.3

Refractoriness under load 0.6MPa ℃  ≥

1670℃

Thermal Shock Resistance

（1100℃ , water cooling）times ≥

30

30-60

Modulus of Rupture MPa ≥

3.5