"Silica G" is a standard grade, unmodified Silica 60 with a surface area of 500 m2/g, mean pore size of 60A, specific pore volume of 0.75 ml/g, and particle size of 5-17um. This analytical soft layer is bound to a glass support. It has a thickness of 250um and dimensions of 20x20cm. There are 25 plates per pack.