The Orochem Reliasil HPLC columns are designed for high efficiency (high plate count) and general utility. The proprietary silica gel manufacturing process yields a Gaussian particle size distribution, narrow pore-size distribution, and strong resistance to high pH. All columns feature a 190 m²/g surface area and 0.55 pore volume. Choose from standard columns with a pore size of 90 Å or columns with a 300 Å pore size.