Porous media from Saint-Gobain are classified on the rate of gas flow under a given set of conditions. Permeability tests provide a means for measuring the uniformity of porous media to provide a basis for quality control.
Saint-Gobain’s line of porous media plates, tubes, spheres, cylinders and discs offer superior uniformity, precision porosity and pore size, high strength, chemical stability and heat resistance.
Alundum® porous media are composed of fused alumina grains held together by a porcelain bond, able to withstand temperatures up to 1000°C. Plates, tubes and discs can operate under high pressure and remain resistant to breakage and chipping.
Porous media from Saint-Gobain are very stable and corrosion resistant to both acidic and alkaline solutions, resulting in longer life and improved performance.
Porous media are classified on the basis of the rate of gas flow under a given set of conditions. This property is known as permeability. Porosity is defined as the percentage of volume of pores to the bulk volume of the piece. All Alundum® porous media have a porosity of 35% to 40%. The pore size and related number of pores are varied to produce the required permeability to suit the application.
The uniform distribution of pores, which is essential to the uniform passage of liquids and gases, is achieved through our controlled structure. This allows us to meet your rigid specification requirements.
For laboratory operations involving diffusion of air, oxygen or other gases into liquids, porous media offer high quality, economical solutions. They are also used for aquaria aeration. The standard grade available is “Fine” for diffusion of small bubbles, thereby obtaining maximum absorption. Coarser grades can be made to order.
Aerators are available with or without nickel-plated brass mountings. Glass or other tubing may be cemented into the inlet hole with ligharage-glycerine or other suitable cement.