种类

Al₂O₃

MgO

Fe₂O₃

SiO₂

Na₂O

CaO

B.D.

显气孔率

AM70

71-76%

22-27%

0.4%max

0.4%max

0.4%max

0.65%max

3.30g/ccm min

5%max

AM90

88-91%

8-11%

0.25%max

0.25%max

0.5%max

0.4%max

3.40g/ccm min

5%max