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| Hytrex® Depth Filters |
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Osmonics unique one step manufacturing process continuously extrudes and thermally bonds pure polypropylene micro fibers into a complex filter matrix.
Microfilaments plus precise control maximize the positive filtration characteristics of graded density, tight micron cut-offs and maximum void area with millions of tortuous paths. This fully automated manufacturing process assures consistent quality, filter to filter, year in and year out. New thermal and vacuum finishing procedures produce exceptionally clean filters imprinted for easy identification in the field. |
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An Entirely New Technology
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Years ago there were string-wound cartridge filters. Later, chopped fibber cartridges cemented with binders were developed. Then in 1978, Hytrex dramatically improved cartridge filter performance.
Proprietary technology supported by 23 patents made Hytrex filters unique in the cartridge filtration industry. Since 1978, field experience in hundreds of applications has proved Hytrex filters' superiority. Thousands of repeat customers have confirmed Hytrex filters' value.
Osmonics' research, engineering and manufacturing expertise has generated further improvements to Hytrex. |
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| What Hytrex Is Not |
it is not strings of yarn mechanically wound around a separate core with added lubricants and anti-static agents.
it is not short chopped fibbers molded together with chemical binders.
it is not layers of non-woven micro fibers.
Pleated, molded and layered micro fibber cartridges function for the most part only as surface filters. Particles collect primarily on the surface, blinding the filter and reducing its effective life.
In molded filters, binders such as melamine, formaldehyde and phenols become extractable and leach into the filtrate. Their decomposition allows fibbers to loosen and migrate. In string-wound filters, additives can leach and particles can slip through channels in the windings, contaminating the filtrate.
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What Hytrex Filters Offer That Other Cartridges Cannot |
| True Graded Density
lower density at the surface of the filter with progressively higher density toward the center.
particles are trapped throughout the entire cross section of the filter, creating superior dirt-holding capacity.
no surface blinding, which reduces flow and increases filter change outs.
high flow rates with low pressure drop throughout the range of flows.
longest service life compared with competitive cartridge filters.
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Thermally-Bonded Micro Fibber Construction
- thermally fixed fibbers will not move under pressure or pressure surges and dislodge dirt into the filtrate.
- extremely small continuous filaments maximize controlled porosity and complex tortuous paths.
- high structural strength and integrity provide excellent end sealing.
- lowest media migration ensures no fibber contamination of the filtrate.
- patented thermally-bonded blown micro fibber process assures consistent performance, filter to filter.
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A Single Pure Material
- highest quality lot-controlled polypropylene.
- contains no wetting agents, solvents, anti-static agents, binders or additives of any kind.
- inert material means broad chemical compatibility.
- no leachables or extractables.
- incinerates to trace ash with no hazardous volatiles, for easy disposal.
- meets the requirements of the United States Food and Drug Administration (FDA) for food and beverage contact.
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Automated Continuous Manufacturing
- continuous construction in lengths of 1 ½ in. (3.8 cm) to 50 in. (127 cm) with no joints or welds.
- self-supporting media requires no separate central core.
- marked with micron rating right on the cartridge for easy filter identification.
- thermal and vacuum finishing procedures virtually eliminate manufacturing debris.
- integral pure polypropylene end adapters fit filter housings without bypass.
- machine packaging and sealing of each cartridge provides clean filters in the field.
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True Depth Filtration vs. Claimed Depth Filtration |
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 while smaller particles penetrate the larger open areas to be trapped nearer the center 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. |
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| CAT Scans Tell the Truth About Graded Density |
CAT Scanning (Computerized Axial Tomography) is a relatively recent breakthrough in diagnostic X-ray imaging technology. In medical applications, it provides detailed cross-sectional images of the human body. Here, CAT scans provide detailed cross-sectional images of cartridge filters.
NOTE: All CAT scanned filters were purchased on the open market and are rated by their manufacturers at 10 microns. All CAT scans were taken with the same scanner at the same setting by the same operator. Lighter areas of the photos indicate greater density. |
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Hytrex ® II - thermally-bonded blown micro fibber matrix-
- true graded density
- particles trapped throughout the depth of the filter
- no separate core
- highest density at knife-edge seal
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String-wound polypropylene-
- inconsistent density
- channels in windings allow particles to
penetrate directly into filtrate
- separate core required
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Single density, polyolefin micro fibbers-
- no graded density
- surface blinding
- no central core
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Molded, resin-bonded fibbers, grooved
- no graded density (apparent second filtration "surface" is actually the groove cut into the filter to increase surface area)
- surface blinding
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Layered non-woven micro fibbers-
- no graded density
- low density layers
- surface blinding
- separate core required
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| Performance |
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TEST CONDITIONS: Several 10 micron filters of each type were purchased on the open market and weighed. They were then challenged with a slurry of 100 ppm AC Fine Test Dust at 5 gpm (1.1 m³/hr) until a 40 psi (276 kPa) differential pressure was reached. All filters were then force dried for 72 hours at 125º F (52º C) and weighed again. The bar chart above illustrates the relative difference in average dirt-holding capacity compared with Hytrex. NOTE: AC Fine Text Dust is the laboratory standard commonly used to characterize cartridge filters with ratings one micron or greater. |
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TEST CONDITIONS: Several 10 micron filters of each type were purchased on the open market and weighed. Each was challenged with a 100 ppm slurry of AC Fine Test Dust at 5 gpm (1.1 m³/hr) until a 40 psi (276 kPa) differential pressure was reached. The bar chart above illustrates that relative difference in average filter lifetime compared with Hytrex.
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A good measure of a cartridge's ionic cleanliness is its "Rinse-Up Time." This is the amount of time required for the resistivity of an 18 megohm deionized water stream to return to its pre-filter resistivity after passing through a new filter cartridge. All cartridges are rated by their manufacturers at 5 microns and were tested at a flow rate of 2 gpm (0.45 m³/hr)
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Because of their unique construction and clean manufacturing process, Hytrex filters provide cleaner performance than conventional depth filters. The above data are based on tests using 10 micron Hytrex filters from Hytrex finished good inventory and 10 micron filters purchased on the open market from the leading string-wound and resin-bonded cartridge manufacturers. Each filter was tested on Osmonics ® "Media Migration Test Stand" at a flow rate of 10 gpm (2.3 m³/hr), twice the highest recommended rate, to stress the filters and simulate pressure surges. After a one minute flush to eliminate start-up debris usually present in housing and piping, the particulate migration was collected from the filtrate using membrane filters which were then weighed at the specified time intervals. All tests were run on sample lots of five individual cartridges, and the results were averaged. In all Hytrex filters, the particulate migration at 60 minutes was below the Lowest Detection Limit (LDL) (0.1 mg) of the test equipment. A more complete test protocol is available from Osmonics
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| Specifications |
Eight Standard Micron Ratings
1,3,5,10,20,30,50,75 Microns
Two Standard Diameters
GX Series:
Inside Diameter: 1 in. (25 mm)
Outside Diameter: 2 1/2 in. (64 mm)
RX Series:
Inside Diameter: 1 3/8 in. (35 mm)
Outside Diameter: 2 3/4 in. (70 mm)
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| End Adapters and Accessories |
All end adapters are thermally-welded to the pure polypropylene Hytrex filter. The positive weld assures bypass-proof performance and structural integrity without adhesives or additives, maintaining cartridge purity. All adapters including the electrometric gasket comply with FDA requirements for food and beverage contact. Adapters and accessories pictured here are immediately available from inventory. Hytrex filters fit all currently available filter housings.
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| A- Electrometric seal gasket, open end |
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| E- Pure polypropylene molded adapter with "222" O-rings |
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| silicon O-rings standard; EPR, Viton, Buna-N O-rings available |
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| F- Pure Locking polypropylene molded adapter with locking "ears" and two "226" O-rings |
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| silicon O-rings standard; EPR, Viton, Buna-N O-rings available |
H- Pure polypropylene molded "fin"
- complete seal
- assures alignment
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K- Pure polypropylene molded spring
- replaces metal assemblies
- provides more positive seal, eliminates bypass
- easy, quick change out
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L- Pure polypropylene extended core
- centers filter on tube sheet adapter
- eliminates tube guide
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S- Pure polypropylene closed end cap
- complete seal
- other end open
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SP- Stainless Steel Support Post
- 316 stainless steel
- extends chemical, temperature, viscosity and (delta) P limits of cartridge
- reusable - more economical than cored cartridges
- chamfered ends ease cartridge installation
- 9.75, 10, 19.5, 20, 29.25, 30 and 40 inch lengths
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FC- Polypropylene Filter Cage
- all polypropylene cage holds 15 Hytrex cartridges
- 30 filter seals reduced to one
- available in 8 different micron ratings
- integral eyehook for handling by mechanical equipment - eliminates handling of individual filters
- standard 10, 20, and 30 inch lengths
- fits housings accepting cages 13 1/2 inches in diameter
- flow rates from 45 to 225 gpm (10 to 51(m 3 /hr) per cage, depending on micron rating of cartridges
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