Used in welding electrodes, 50 mesh to 325 mesh *Welding grade 1. Physical-chemical index (%):1) LN-MA: SiO2≥49, CaO≥43, Fe2O3≤0.35, Al2O3≤1.0, MgO≤1.0, S≤0.01, P≤0.01, LOI≤1.02) LN-MB: SiO2≥49, CaO≥43, Fe2O3≤0.35, Al2O3≤1.5, MgO≤2.0, S≤0.01, P≤0.03, LOI≤2.0 2. Features:1) 50 mesh to 325 mesh2) Used in welding electrodes