[Retracted] Development of Quality Information Management System for Alumina Ceramic Tube Manufacturing Process

Table 1

Composition and properties of alumina ceramics.

Chemical composition	Parameter (%)	Physical properties	Parameter
Aluminum	>94	Density	3.42
Silica	<2.4	Apparent porosity	0.31
Iron trioxide	<1.9	Compressive strength	277
Monovalent oxide	<0.6	Refractoriness	1721–1810