Originally Published EMDM September 2002
Adhesive filter components
High-precision filtering components are combined with one or several adhesive layers to enable a fast and efficient joining process. The components can be supplied on carrier tapes and feature a nonfraying edge and tightly controlled geometric dimensions. Sefar Inc., Rüschlikon, Switzerland.
Membrane filter holders
A range of membrane filter holders have a borosilicate glass liquid pathway to ensure that liquid samples remain contamination free, and a sintered glass disk to support 25- and 47-mm-diam membranes. The fully autoclavable equipment also includes a 15- or 300-ml-capacity funnel with at-a-glance graduations and a metallic retaining clip. A complete system for applications requiring a vacuum is also available, with a conical flask and connection to ensure a tight fit and efficient filtration. Bibby Sterilin, Stone, Staffs, UK.
Screen membranes
Screen membranes are supplied in a wide variety of pore sizes, flow rates, polymers, and surface treatments. A cross-sectional pattern facilitates lateral flow. The screen membranes are custom fabricated in Class 10,000 cleanrooms. SaatiTech S.p.A., Veniano (CO), Italy.
Feedthrough filters
Ceramic chip components combine capacitor and inductor elements in a single distributed constant circuit filter. The surface-mountable chip filters are suited for EMI noise suppression in high-speed applications. The chips provide low parallel inductance and decoupling capabilities. The series of filters is rated at 100 V and 300 mA with capacitance ratings ranging from 22 to 47,000 pF. The broadband filters feature typical attenuation offerings of 30–60 dB across user-selected frequency spectrums. AVX Corp., Myrtle Beach, SC, USA.
Disposable filters
Disposable 25-mm filters are suited for small-scale applications and research studies in which feedstock requirements are minimal. With an active filtration area of 3.5 cm2, these small devices are particularly useful as an evaluation tool for impurity studies, protein passage studies, membrane area determination, and virus validation. Millipore S.A., St. Quentin Yvelines, France.
IV filters
Filters, vents, and flow control devices are manufactured for use in disposable blood therapy, IV, and enteral feeding sets. Catheter vents, spike vents, transducer protectors, vented IV bacterial filters, check valves, transfer filters, and needleless connectors are provided by the ISO 9001–certified company. Filtertek B.V., Newcastle West, Co. Limerick, Ireland.
Air filters
A range of air filters is available that includes bacterial and viral filters. HME, HMEF, CPAP and BIPAP, and suction and vent filters are also supplied. The filters attain bacterial efficiencies of 99.99999% for use in anaesthesia, drug therapy, spirometry, and many specialized medical applications. Air Safety Ltd., Morecambe, Lancs, UK.
Prefilter media
Prefilter media are custom manufactured using proprietary fibre-conversion processes. They are available in acetate, nylon, and polyester fibres without resin or adhesive binders that could contaminate the filtrate. Typical applications include heat-moisture exchange, centrifugal platelet separation, and blood and mucus evacuation applications. A wide range of cross-sectional sizes are designed and manufactured to meet customer requirements related to physical dimensions, filtration capture rates, flow resistance, and other performance specifications. Filtrona GmbH, Reinbek, Germany.
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