The row materials of calcium aluminate CA-70 are high pure calciu m and high pure alumina.

 1 the cement of Al2O3 is controlled in 68-72%.

 2 the eariy strength is high and strength in medial temperture is also high, the refractoriness is 

    more than 1650.

 3 it has high eroslion resistance to reducing medium such as Co,H2.CH4.