E-PAK™ Cartridges, SiliaMetS™ Imidazol (Si-IMI) is a versatile metal scavenger for a variety of metals including Cd, Co, Cu, Fe, Ni, Pd, and Rh under a wide range of conditions conveniently packaged in a cartridge. E-PAK™ lab cartridges are generally used for processing samples of 50 mL or more.