Filtration is a technique that utilizes a porous membrane to separate suspended or dissolved materials in a solution based on size or molecular weight.
Smaller particles pass through the membrane barrier as filtrate while the larger particles are retained. The type of filtration selected is based on retentate and pore size.
Macrofiltration is defined as the filtration of particles that are 5 µm or greater. Spectrum's Spectra Mesh® woven screens used in
macrofiltration applications are available in several polymer types with opening sizes ranging from 5 µm to 1 mm.
Microfiltration (MF) is filtration with membranes that have pore size ranging from 0.02 to 0.65 µm in diameter. Spectrum's Hollow Fiber
Filters used for Tangential Flow Filtration provide efficient and reliable separations in microfiltration applications.
Ultrafiltration (UF) is defined as filtration of particles ranging in size from 1 to 1,000kD. Since the shape of these particles significantly affects retention,
pore size ratings of UF membranes are determined as the nominal molecular weight cut off (MWCO) that retains 95%. Spectrum's Hollow Fiber Membrane Filters with
MWCO ranging from 10kD to 500kD were designed for use in Ultrafiltration applications.