Millipore Express® PES Membrane Filters

Millipore Express PLUS PES MembraneWhen filtering large volumes or heavily contaminated solutions, such as crude cell lysates, membrane pores can fill up to maximum capacity, slowing the rate of filtration. For these types of processes, Millipore Express® polyethersulfone (PES) membrane filters have the highest filtration capacity

These filters have an asymmetric pore structure – at the top, where filtration starts, the pores are larger. The pore size then decreases from the top face of the filter to the bottom, where the pore size is small enough to retain bacteria (0.1 μm or 0.22 μm). This asymmetric pore design traps large particles at the top so that they do not clog the tight pores on the retentive side of the membrane, enhancing the filtration capacity and useful life of the filter.


Millipore Express® PLUS PES Membrane Disc Specifications
Membrane Material Polyethersulfone (PES)
Pore Sizes (μm) 0.22, 0.45
Thickness (μm) 130 - 185
Water Flow (mL/min/cm2) @27.5 in. Hg 27 to greater than 44
Air Flow (L/min/cm2) @ 10 psi 0.12 - 68.9 (typical values)
Porosity (%) 70 - 84
Wettability Hydrophilic
Protein Binding Capacity (IgG) 22 μg/cm2
Chemical Compatibility Recommended for aqueous solvents
Sterilizability Autoclave, EtO, gamma irradiation
Surface Option White, plain, gridded
Key Properties Fast flow, high throughput, low protein-binding
Key Applications Sterilizing filtration of biological solutions
Also used in Sterile Millex® Syringe Filters for Cell Culture, Stericup® Filters


Millipore Express® PLUS Membrane Filters
Catalog Number Pore Size Filter Diameter (⌀) Pack Size Add to Cart
GPWP01300 0.22 µm 13 mm 100
GPWP02500 0.22 µm 25 mm 100
GPWP04700 0.22 µm 47 mm 100
GPWP09050 0.22 µm 90 mm 50
GPWP14250 0.22 µm 142 mm 50
HPWP01300 0.45 µm 13 mm 100
HPWP02500 0.45 µm 25 mm 100
HPWP04700 0.45 µm 47 mm 100
HPWP09050 0.45 µm 90 mm 50
HPWP14250 0.45 µm 142 mm 50
Catalog Number Description Pack Size Add to Cart
XX6200006P Filter forceps, blunt end, stainless steel 3