C18 Spherical Silica Gel, Premium Rf has a porosity of 70A, particle distribution of 40-75um, and a quantity of 100g. Spherical Silica Gel, Premium Rf when compared to granular silica gels show an increase loading (up to 30% more), greater reproducibility of process, sharper peaks and cost savings (less solvent consumption and labor), longer bed lifetime (decrease cost of labor and silica consumption), and better chromatographic results. This high-purity spherical silica gel is ideal for flash chromatography, industrial scale LC, and batch adsorption applications. C18 is the most popular and versatile reversed phase, capable of hydrophobic interactions with a wide variety of organic compounds. It is used for separation of nonpolar to moderately polar compounds such as: Fatty Acids, Glycerides, Polycyclic Aromatics, Esters (Phthalates), Fat-Soluble Vitamins, Steroids, Prostagl&ins, PTH amino acids.