Used as filler, 100 mesh to 2500 mesh *Filler grade 1. Physical-chemical index (%):1) LN-FA: SiO2≥49, CaO≥43, Fe2O3≤0.35, Al2O3≤1.0, MgO≤1.0, LOI≤1.02) LN-FB: SiO2≥49, CaO≥43, Fe2O3≤0.35, Al2O3≤1.5, MgO≤2.0, LOI≤2.0 2. Features:1) 100 mesh to 2500 mesh2) Used as filler