Silica Gel, 28-200 Mesh, Grade 12 For Chromatography,100 G - 89051 Loss on Drying @ 200 C 5.0 % Max, Particle Size on 30 Mesh 6.0 % Max, Particle Size Through 200 Mesh 6.0 % Max CAS #:7631-86-9 UN#:CHEMICAL N Ship Name:SILICA GEL, 28-800 M,GR12 Formula:SiO!2