Syringe Filters, Cellulose Acetate (CA), 0.45um, Sterile, 13mm, 100/pack · Very low binding capacity for proteins. · Material is nitrate-free making it suitable Syringe Filter for Sale – HPLC Vials Pore size: 0.22μm/0.45μm. Diameter: 13mm/25mm. Membrane: Nylon, Hydrophilic PVDF, Hydrophilic PTFE, Hydrophobic PTFE, PES, MCE, Hydrophilic PP,