Items			Unit	Index	Typical
Chemical composition		Al2O3	%	41.00-46.00	44.68
		ZrO2	%	35.00-39.00	36.31
		SiO2	%	16.50-20.00	17.13
		Fe2O3	%	0.20max	0.09
Bulk density			g/cm3	3.6min	3.64
Apparent porosity			%	3.00max
Phase	3Al2O3.2SiO2		%	50-55
	Indined ZrSiO4		%	30-33
	Corundum		%	5.00max
	Glass		%	5.00max

It is used in specialty product applications where a high resistance to environmental corrosion and a low coefficient of thermal expansion are desirable properties. Applications include ceramic pressure casting tubes and refractory shapes requiring resistance to molten slag and molten glass. Zir-mull bricks and bricks used in the Glass Industry as well as an additive in Continuous casting refractories.