Understanding Purolator's Porous Metals Technology
Purolator developed porous metal technology in 1958 as a response to the rigorous requirements established by our aerospace customers. Since then, design engineers in hundreds of disciplines have found that Purolator's diffusion-bonded porous metals meet their demanding requirements. They can be manufactured in almost any shape, size or porosity for filtering, transpiration cooling and noise suppression as well as a wealth of other uses.
Our proprietary diffusion-bonding process is the key. We start with porous stainless steel materials that are layered, woven or pleated to provide the proper combination of application properties: fine filtration, flow resistance, pressure drop, cooling efficiency and more.
The entire unit is then sintered at high temperature in a controlled atmosphere furnace to diffusion bond all the layers and every contact point. This creates a sintered laminate bonded media that is surprisingly strong, ductile and corrosion resistant.
Purolator porous metals are environmentally friendly. Because they are durable and non-absorbent, they can be backwashed, cleaned and reused, thus eliminating a major headache of filter disposal.
Poroplate® media are seamless sheets of porous metal laminates made from diffusion-bonded wire cloth, fiber metal felts and perforated plates or foils that provide unique combinations of strength and accurate filtration. Click here for more detailed information on standard Poroplate® sheets.
A Poroplate® sheet starts with a precisely engineered filter medium of 2 to 200 microns. The material is usually 304L or 316L stainless steel wire cloth or felt, although Monel®, Inconel® and other special alloys may be substituted for specific applications.
Additional layers of calendered wire cloth are then layered on both sides of the filter medium to provide strength and support. These supporting layers are woven in a variety of square, twill, dutch and dutch twill weaves and then exactly positioned for optimum permeability.
The entire structure is then furnace-sintered in a controlled atmosphere to diffusion bond the individual wires and multiple layers. The resulting integrated sheet is strong, ductile and corrosion resistant.
Inherent adaptability makes Poroplate® media the perfect sintered laminate material for a wide variety of applications. Poroplate® panels, tubes and discs make excellent filters for tough industrial environments. Tubes and cones are used to fluidize dry granular materials such as cement and polymer pellets. Specialty constructions have even been used in noise suppression, transpiration cooling, vacuum forming and dewatering.
laminates are as versatile as you need them to be.
GKN Sinter Metals Filters®
Click here for more detailed information on GKN Sinter Metals Filters®
Cylinders are wound from 347 stainless steel wire of .07 to .13mm, although larger wire and ribbons of special alloys (Monel, Hastelloy®, titanium and more) may be used.
Winding machines are computer-controlled to lay down wire spacings and geometries that establish filtration ratings of 10, 20, 40, 75 and 100 micro m. Other ratings are easily accommodated.
Flow resistance is controlled by the configuration of the wind pattern. The pore may be designed to produce a tortuous path (excellent for fine filtration), a straight-through path (for greater permeability) and anywhere in-between.
After winding, Poroloy® cylinders are furnace sintered to diffusion bond all the wire contact points. The resulting unit is strong, ductile and corrosion resistant.
Poroguard® filters are produced by placing woven wire cloth (or other filter media) within the wall of a Poroloy® tube. The wire cloth acts as the filter medium while the wound wire provides strength and protection for the mesh. Poroguard™ elements are recommended for demanding applications requiring absolute filter ratings and high throughput.
Poroloy® and Poroguard™cylinders are available in a broad range of diameters, lengths and thicknesses.
Poromesh® media is made from 304 or 316 stainless steel as well as more exotic alloys like Monel and Inconel. This pleated media can be formed into cylinders or stamped into discs. The multilayer pleated construction makes Poromesh® elements particularly suited for rugged usage. The pleating provides maximum filtration area, flow distribution and dirt capacity. Support meshes prevent collapse and bunching of the pleats at high differential pressure. Yet a Poromesh® element is easily cleaned for reuse.
End closures are attached by electron beam welding for the optimum combination of structure, strength and cleanliness of weld. Porofelt® media is Poromesh® media with one or more layers of fiber metal felt furnace-sintered and pleated with mesh for higher contaminant capacity and structural integrity.
Poromesh® and Porofelt® elements are available in almost every size imaginable from 3mm discs to cylinders over 1 meter in length, each custom designed for your unique application.
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