Firing High-Purity Magnesia Brick

Chemical composition%

MgO  %

≥97.5

≥96.5

≥96

≥95

≥60

76-85

SiO₂  %

＜0.5

≤1.5

≤1.5

≤2.0

＜0

ZrO₂

6.5-13

Fe₂O₃  %

＜1.0

≤0.8

≤0.8

Cr₂O₃   %

≥12

Physical

performance

Apparent porosity   %

＜16

≤16

≤15

＜17

＜18

6～8

Cold crushing strength Mpa

≥65

≥60

≥60

≥59

≥34

0.2MpaLoad softening temperature

T0.6 % ℃

≥1700

≥1700

≥1700

≥1650

≥1700

≥1600

Bulk density

g/cm³

≥3.1

≥3.05

≥3.05

2.95

2.95

≥3.15

High temperature flexural strength Mpa

1400℃×3h

＞5.8

＞5.8

≥8