Type

Performance

Feldspar

Feldspar

mullite

Mullite

Mullite corundum

Corundum

Chemical composition

%

AL2O3

20-30

30-45

45-70

70-90

≥90

AL2O3+SiO2

≥90

Fe2O3

≤1

Water absorption     %

≤5

Acid resistance       %

≥98

Alkali resistance      %

≥80

≥82

≥85

≥90

≥95

Heat resistance      °C

≥1300

≥1400

≥1500

≥1600

≥1700

Crush strength

N/granule

3

≥120

≥140

≥150

≥160

≥200

6

≥400

≥420

≥440

≥480

≥500

8

≥480

≥520

≥600

≥620

≥650

10

≥600

≥700

≥800

≥900

≥1000

13

≥1000

≥1100

≥1300

≥1500

≥1800

16

≥1500

≥1600

≥1800

≥2300

≥2600

20

≥1800

≥2000

≥2300

≥2800

≥3200

25

≥2500

≥2800

≥3200

≥3600

≥4000

30

≥3000

≥3200

≥3500

≥4000

≥4500

38

≥4000

≥4500

≥5000

≥5500

≥6000

50

≥6000

≥6500

≥7000

≥8500

≥10000

75

≥10000

≥11000

≥12000

≥14000

≥15000

Bulk density      kg/m3

1100-1200

1200-1300

1300-1400

1400-150

1550

Note The above data is for reference only.