The high purity, low level of fines, low water content and neutral pH of Material Harvest®silica gels provide an ideal stationary phase for optimum and reproducible purification. Our column chromatography silica gel 60 is available in a variety of particle size or "mesh" grades, including mesh 70 – 230 (63 – 200 µm) and mesh 230 – 400 (40 – 63 µm).