Physical properties:

Model:	Cascade Mini Ring
Shape:	Ring
Color:	Light Grey
Chemical composition
SiO2	Al2O3	Fe2O3	CaO		K2O+Na2O
>70%	23-30%	<1%	<1-2%		<2-4%

Physical properties
Index					Value
Specific gravity(g/cm3)					2.25-2.35
Water absorption (%)					<0.5
Acid-resisting strength, %Wt. Loss (ASTMc279)					<4
Firing temperature(Degree C)					1280-1320
Softening point( Degree C)					>1400
Density(kg/m3)					2350