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Measuring a Filter's Performance
was chosen because particles of this size are the most difficult to retain in many air filters. Filter Efficiency measures the percentage of particles which are removed from the fluid by the filter. In filtration of liquids, filter efficiency is given on the basis of particles at or above a certain
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Choosing the Appropriate Membrane
) Membranes. Regenerated Cellulose (RC) Membranes. Teflon (PTFE) Membranes. Membrane Filter Sample Packs. Membrane Disc Filter Accessories. Syringe and Capsule Filters. Cellulose Acetate Syringe Filters. Glass Fiber Syringe Filters. MCE, Nitrocellulose, Mixed Ester Syringe Filters. Nylon Syringe
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Evaluating the performance of polysulfone membrane filters in SC-1 chemistries
filter cartridges have been the industry standard for many years because the membrane material can withstand elevated temperatures in acetic and base chemical cleaning solutions while providing excellent particle capture efficiency. Despite these capabilities, PTFE cartridges have their drawbacks
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Medical Device Link . Filter Technology Separating the Good from the Bad
need to be thick and fashioned from materials such as asbestos, glass fiber sheets, cloth, and paper. Surface filters trap particles at the top of the matrix as the fluid flows easily through. Membrane filters can almost always be classified as surface filters. One common filter membrane
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Tangential Flow Filtration Explores New Niches
traction. Disposable filter cassettes, as well as bags, adaptors, tubing and other filtration system components, are now commonplace. Major filtration vendors are racing to offer entire off-the-shelf disposable tangential flow systems--Sartorius Stedim, for example, expects to have completely
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Downstream Bioprocessing: More is More
membrane adsorbers. Think of these as a cross between filter membranes and chromatography media, with the speed of the former and the selectivity of the latter. In one study Sartorius investigators, working with Abgenix (Fremont, Calif.), achieved log removals of a typical panel of test viruses ranging
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MICRO: Tool/Fab Support
, and the membrane's pore size plays a role in microbubble removal. Filter manufacturers must perform a balancing act by developing membrane surfaces that both remove bubbles from photochemical fluid and retard bubble formation downstream of the filter. Optimal Filter Surface Properties. The optimal filter has
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Sterilizing Filters: Right Flow, Right Size Critical
or aqueous solutions. Since such fluids typically contain only very low levels of contaminants, a sterilizing filter s throughput is far less important than its speed in transferring fluid from a mixing vessel to either holding vessels or disposable bag containment. The longer the transfer takes