Type

Properties

Lower sodium I

Middle sodium II

Fraction(mesh)
0-1 1-2 3-5m/m

Fine(mesh)
0-180 0-320

Fraction(mesh)
0-1 1-2 3-5m/m

Fine(mesh)
0-180 0-320

Guarantee Value

Typical value

Guarantee Value

Typical value

Guarantee Value

Typical value

Guarantee Value

Typical value

Chemical Composition (%)

α-Al₂O₃

≥99

99.3

≥98.5

99.23

≥99

99.14

≥98.5

98.75

SiO₂

≤0.2

0.15

≤0.3

0.22

≤0.4

0.12

≤0.4

0.19

Fe₂O₃

≤0.2

0.04

≤0.25

0.04

≤0.2

0.01

≤0.25

0.05

Na₂O

≤0.15

0.12

≤0.25

0.18

≤0.4

0.35

≤0.5

0.23

Principal crystalline phase

α-Al₂O₃

Crystal system

Hexzagon

Color

white

True density (g/cm³)

≥3.95

Packing density (g/cm³)

1.75-1.95

Mohs hardness

9

Linear expansion (1/^°C)

8.3×10^-4

Size(mm)

8-5 5-3 3-1 1-0

Fine(mesh)

-80,-120,-240,-320

Micropowder(um)

3-5 5-10

Test standard

GB/T3044-89

Packing

25kg/bag 1000kg/big bag

Usage

Refractories