ITEM

Special

First

QUALIFIED

Whiteness

95% MIN.

90% MIN.

88% MIN.

SiO₂

61% MIN.

58% MIN.

55% MIN.

MgO

31% MIN.

30% MIN.

30% MIN.

CaO

0.45% MAX.

1.00% MAX.

1.50% MAX.

Fe₂O₃

0.30% MAX.

0.40% MAX.

0.50% MAX.

Al₂O₃

0.20% MAX.

0.30% MAX.

0.30% MAX.

L.O.I.

6.00% MAX.

8.00% MAX.

10.00% MAX.

Volume density
(g/cm³)

Loose density
Tight density

0.45
0.90

0.55
0.95

0.65
1.00

Moisture

0.5% MAX.

0.5% MAX.

1.00% MAX.

Passing through (45µm)

98-99.8

99.5% MIN.

98.5%MIN.