Al2O3,%

≥80

≥85

≥80

≥85

Al2O3+MgO+Cr2O3,%

≥92

≥92

≥92

≥92

氣孔率/Apparent porosity,%

≤20

≤20

≤20

≤19

耐壓強度/Cold crushing strength, MPa

—

—

85

≥45