SPE units contain Polyethersulfone (PES) membranes. These CHM® ready-to-use syringe filter units are designed to remove particles during general filtration. They are ideal to use in life science applications. Preparation of aqueous, biological or protein-based solutions for chromatography analysis. Also available in individual sterile peel-pack. They are supplied in two different pore sizes, 0.2 and 0.45 μm, and in two diameters: 13 and 25 mm.