Clarwick offer three types of depth filters as manufactured by Osmonics inc. These cartridges are of a pure polypropylene construction, using FDA approved materials, which meet NSF Standard 58 with the manufacturing process being ISO 9001 certified.
The one step manufacturing patented process employed by osmonics continuously extrudes and thermally bonds pure polypropylene micro-fibres into a complex filter matrix. Micro-filaments plus precise control maximise the positive filtration characteristics of graded density, tight micron cut-offs and maximum void area with millions of tortuous paths. This manufacturing process assures consistent quality, filter to filter, year in and year out.
CONSISTENT FILTRATION, HIGH DIRT HOLDING, LOW COST, CLEAN
Many cartridges claim to be depth filters but to be a true depth filter a cartridge must be able to retain contaminants throughout the entire cross section of the filter. To accomplish this, the density must increase progressively from the exterior surface to the interior, This "graded density" allows larger particles to be trapped near the surface. The smaller particles penetrate the large open areas to be trapped nearer the centre of the filter in the smaller openings. Without graded density, a so-called 'depth' filter will operate in practice only as a surface filter. With only the surface area loading with dirt, the pressure drop will increase rapidly, dramatically reducing both the dirt-holding capacity and the effective filter life.
 PURTREX:
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(LONG LIFE, LOW COST, ADDITIVE FREE)
This cartridge meets the requirements of most non-critical applications as well as serving as an economic pre-filter. Purtrex uses a patented blown microfibre technology. This pure polypropylene, surfactant-free depth filter with exceptional dirt-holding capabilities has become the replacement product to string wound and wrongly specified resin-bonded cartridges. The result is exceptional value for general applications where long life, high purity and low change-out frequency are required.
HYTREX:
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(INCORPORATED IN OSMONICS OWN STSTEMS)
The Osmonics Hytrex cartridge is recongnised as the original spun-bonded filter. Having evolved over the years as technology allows, Hytrex offers clear advantages over Purtrex in certain applications. With 20% more polypropylene, it creates a longer and cleaner manufacturing process and provides 15% greater efficiency. As an indication of this ionic cleanliness rinsing to 18 megohm is achieved in under 12 minutes, approximately half the time of Purtrex (note- standard string wound and resin-bonded cartridges cannot reach this standard). Hytrex also has obvious benefits with its packaging from clear case identification to each element being embossed with its code- reducing the risk of installation error.
Osmonics is continuing to expand its product line of Hytrex elements to meet current market demand with the indroduction of the new large (LD) filter. Engineered with gradient density throughout the depth, this cartridge provides exceptional dirt-holding capacity and unequalled life compared to equivalent rated standard filters. The Hytrex LD filter, with up to eight times greater dirt-holding capacity and life, reduces change out frequency and is ideally suited to be used in Ametek's Big Blue Housings.
SELEX:
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(ECONOMIC, NEAR ABSOLUTE FILRATION)
 Selex is the most technically advanced spun-bonded filter cartridge manufactured by Osmonics. For critical filtration applications that require greater particle selectivity Selex uses microfibre up to 70% smaller than was previously possible. The result is a highly efficient long-life cartridge with a sharp cut off for process applications requiring clarifying separation. Selex's cleanliness is also the best of the spun-bonded trio with a 18 megohm/cm water stream returing to 18 megohm/cm, having passed through a new filter, in under 4 minutes. Selex is, like Hytrex, embossed with its product codes.
WOUND RANGE:
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(Versatile and economic with complete quality control)
Basic technology that works. Wound filter cartridges have been successfully used in industry for decades, with little change in the method of manufacture, and are an effective matrix for trapping particulate within the media.
Available in 3 medias and a wide span of micron ratings, wound filter cartridges offer cost effective particulate filtrate with a history to prove it.
POLYPROPYLENE:
This is the most popular cartridge media, because of its broad chemical compatibility, good temperature resistance and low in cost. A washed version is available for applications where the filtrate stream will be adversely affected by the anti-static additives.
COTTON:
Normally used where polypropylene is chemically incompatible with the filtrate. The most common application being the filtration of chlorinated solvents in degreasing units. In such instances a stainless steel core is recommended.
GLASS FIBRE:
The primary advantage of glass fibre is its ability to withstand temperatures to 4000C, often making it the sole choice. Similarly, when filtering oxidising agents, glass fibre is the only economic cartridge with excellent chemical compatibility.
WOUND POLYPROPYLENE BB (4 1/2"diameter)
The wound BB range is for use in housings such as the "Big Blue" housing offering the same advantages as the standard polypropylene wound but with up to 8 times the dirt holding capacity. Available in polypropylene at 10" and 20" lenghts only.
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POLYDEPTH:
(Strong polypropylene construction for viscous fluids)
This thermal-bonded micro-fibre polypropylene construction offers no fibre release and high consistent flow rates due to unique micro-grooves providing added surface area. It produces a rigid cartridge that is less subject to collapse than any wound or pleated cartridge, yet is not brittle or prone to the breakage problems common with resin-bonded cartridges. Polydepth should be specified where temperature and viscosity are outside the specifications of Osmonics' spun-bonded range.
RESIN BONDED:
(Designed for adhesive, ink and polymer filtrations)
With the majority of inexpensive filter cartridges containing polypropylene, the filtration of many fluids is not feasible; hence the development of this cartridge. Being manufactured from resin-bonded fibreglass on a tin core, it has the ability to purify adhesives, inks and polymers at high temperature and high viscosities is achieved.
Fast flow rates are maintained due to the grooved construction increasing its surface area and the true depth matrix trapping particulate through the entire cross-section of the cartridge.
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