Upchurch Scientific® BPR Cartridges have a maximum internal volume of 146 µL. The cartridge bodies are manufactured from inert PEEK™ and Tefzel® (ETFE) polymers. Internal components are manufactured from PEEK, highly fluorinated elastomer and gold-plated stainless steel. The replacement cartridges will operate in any of the standard BPR holders. These cartridges create back pressures from 40 to 1000 psi (2.8 to 69 bar).