Typical Technical Composition

Min. %

Max. %

Usual %

SiO2

64.00

75.00

68.40

Al2O3

19.00

26.00

24.50

Fe2O3

0.12

0.10

TiO2

1.40

0.96

CaO

0.65

0.42

MgO

0.60

0.38

Na2O

2.00

1.12

K2O

3.50

3.28

Al2O3 + SiO2

90.00

96.00

92.90

Index

Value

  Value

Leachable Iron

≤ 0.1%

Apparent Porosity by Weight, dia. ≥ 10mm

≤ 0.4%

Apparent Porosity by Weight, dia. = 6mm

≤ 1.0%

Apparent Porosity by Weight, dia. = 3mm

≤ 1.0%

Moh's Hardness Scale

>6.5

Water Absorption

<1.0wt.%

Acid Resistance

>99.8%

Thermal Conductivity

0.9-1.0 w/m 2 .k

Thermal Expansion 500

0.20%

Specific Heat

628-837 j/kgq

Thermal Shock Stability, 500 then water cooling

10 times

Max. Operating Temperature

1050

1922

Specific Density

2,350 kg /m 3

146 lb /ft 3

Bulk Density (Packing Density)

1,350 g /cm 3

84 lb /ft 3

Size /

Crush Strength

Nominal Size

(lbs)

(kg)

(N/pc)

mm

Inch

min.

min.

min.

3

1/8

50

23

225

6

1/4

123

56

550

10

3/8

202

92

902

13

1/2

385

175

1716

16

5/8

520

236

2315

19

3/4

978

444

4355

25

1

1428

648

6355

38

1-1/2

2020

916

8983

50

2

2987

1355

13288