Polyethylene, a dialectric plastic exhibits the property of generating appreciable electro- static charges under the influence of an airstream. As with many other plastics, friction such as that of an airstream will cause electrostatic charges to build up on the surface of the material. Since no source of electrical energy is required to create these charges, polyethylene is properly considered self-charging. Both charges, positive and negative will appear on the polyethylene fibres. Since airborne dust particles are by nature either negative or positive, they are strongly attracted and held by opposite charges on the polyethylene media. This electrostatic resistance greatly enhances the normal mechanical action of the filter.

Particles in the sub-visible range (ten microns and lower) are the major cause of surface soilage and electrical circuit failure. Normal air filters do not arrest these particles and they remain airborne, causing soiling or damage to goods downstream of the filter. Control of these fines in ventilating systems is normally achieved through the use of costly filters. The Pliotron system was found to provide economic filtration over an extremely broad range of particle sizes. The result is entirely adequate filtration performance at low cost for the majority of industrial and commercial ventilation systems. In those systems requiring clean room conditions or absolute filtration, the broad performance range of a Pliotron air filter is extremely certain to extend the life of the high-efficiency air filter.

The polyethylene media incorporated in the Pliotron air filter is inert to virtually all chemicals, fumes and acids encountered in industrial installations. The self-charging electrostatic characteristic will last the life of the filter. Filtration performance is unaffected by humidity since extremely high surfaces resistivity is maintained up to 90% R.H.

Static Pressure Drop
Heavy Duty Filter

Net Face
Velocity (fpm)      300   400   500    600   700

Pressure
Drop (ins. H₂O)    300   400   500    600   700

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Copyright 1997 Pliotron Company of America L.L.C.
All rights reserved.