C18 is the most popular and versatile reversed phase, capable of hydrophobic interactions with a wide variety of organic compounds. C18 Silica Gel, Premium Grade has a porosity of 60A, a particle distribution of 40-63um, and a quantity of 100g. It is used for reversed phase chromatography for separation of nonpolar to moderately polar compounds such as: Fatty Acids, Glycerides, Polycyclic Aromatics, Esters (Phthalates), Fat-Soluble Vitamins, Steroids, Prostaglandins, PTH amino acids.