SiO2

Al2O3

SiO2+Al2O3

Fe2O3

CaO

MgO

K2O+Na2O

Other

>69%

15-23%

>92%

<1%

<0.25%

<0.2%

2-4%

<1%

Index

Value

Porosity(Vol%)

1

Specific heat(KJ/Kg)

840-900

Crush strength(N/mm2)

390-420

Specific gravity(g/cm3)

2.3-2.45

Acid resistance(%)

99.98

Firing temperature(℃)

1280 – 1320

Softening temperature(℃)

>1400

Density(Kg/m3)

2300 – 2400

Water absorption(%)

<0.2

Thermal expansion(10-6mm/mm℃)

4.7

Moh’s hardness(Scale)

7 – 8

Comprehensive strength(Newtons)

5600

Shock strength(Kgf.cm/cm2)

1.0 – 1.5

Nominal Size

Approx.Weight

Surface Area

Void Fraction (%)

Dry Packing factor (m-1)

inch

mm

lb/ft3

Kg/m3

ft2/ft3

m2/m3

1"

25mm

40

645

79.5

260

77

570

1.5"

38mm

37.5

600

64

210

78

430

2"

50mm

35.6

570

42.8

140

79

277

3"

76mm

36

580

32

105

77

206