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.