... low ventilation ability. Index ItemWLT-1WLT-2WLT-3Al2O3,%≥656055C,%≥111111Fe,%≤1.51.51.5Compress strength, Mpa≥706050Volume,density,g/cm3≥2 ... ,um2(mDa)≤4.94×10-4(0.5)1.97×10-3(2.0)1.97×10-3(2.0)Average aperture ... , um≤0.511<1um hole cubage,%≥807-70Note: 1. The testing scope for aperture:0.006um-360um2. The melting iron corrosion ...