Ceramic roller - CK767,CK745,CK750,CK720

Performance index CK767 CK745 CK750 CK720
Al2O3+ZrO2(%) 78-80 76-78 74-76 72-74
Apparent porosity (%) 17-21 18-22 18-22 18-22
Water absorption(%) 7.9-9.0 7.5-9.5 8.0-10.0 8.0-10.0
Density(g/cm3) 2.55-2.65 2.50-2.60 2.45-2.55 2.40-2.45
Bending strength(Mpa) >60 55-60 50-55 45-50
(13500-20℃) Very good Very good Very good Very good
Thermal shock resistance
Maximum working 1***0 1180
temperature(℃)
Refractoriness under load 1***0 1530
(℃)(0.2Mpa)
Coefficient of thermal 5.7 5.6 5.5 5.3

expansion (X10-6/℃)
(25～1000℃)
Linearity(mm) ≤0.07% ≤0.07% ≤0.07% ≤0.07%
Outer diameter deviation(mm) ≥φ50:+0.3 -0.7