SiO2

Silica

66.46

Al2O3

Alumina

15.81

Fe2O3

Iron

7.38

TiO2

Titania

0.75

MnO

Manganese

0.40

MgO

Magnesia

1.88

CaO

Calcium

0.56

Na2O

Sodium

2.10

K2O

Potassim

2.20

P2O5

Phosphorus

0.15

C,S,H 2 O

Less

2.20

Physcal Properties

Density （ ρ ）

2.78-2.82×103 Kg/m3

Resist pressure

118 （ MPa ）

Resist Break

30.3 （ MPa ）

Rigidity

88.6Kg/mm2

Polish degree

52

Absorption water

0.1%

Modules of rupture

71

Chemical Resistance

70%

HNO3

Nitric Acid

No reaction or penetration after 8-hour immersion in

60%

HClO4

Perchloric acid

36%

HCl

Hydrochloric acid

H3PO4

Phosphoric acid

HC2H3O2

Acetic acid 

H2CrO4

Chromic acid

30%

NaOH

sodium hydroxide

Na3PO4

Tri-sodium Phosphate

98%

H2SO4

Sulfuric acid

Some reaction or penetration after 8-hour immersion in

48%

HF

Hydrofluoric acid