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Donaldson Membranes has now added the polyester epitropic/ePTFE membrane filter media range to its collection of certified antistatic products for use in explosive fabric filter applications.

EC Atex directives require that filter media intended for use in potentially explosive environments must return a maximum electrical resistance of 1 x 108ohm, both laterally and cross directionally (across and through the media).

In contrast to the company’s already certified products that incorporate stainless-steel fibres in the substrate of the Tetratex ePTFE membrane filter laminate, the latest developments utilise epitropic fibres (carbon-impregnated polyester) to provide the requisite conductivity.

Epitropic fibres have long been employed in industrial filtration applications to provide conductivity.

However, by re-engineering the product characteristics, Donaldson Membranes claims that it is now able to manufacture a product that carries the necessary certification by Dekra Exam while still maintaining excellent filtration efficiency and life performance.

Many dusts handled in fabric filters are inherently volatile and explosions are possible where static charge (within the dust on filter bag surfaces, for example) is allowed to accumulate.

It is, therefore, important to rapidly dissipate any such charge to earth.

Donaldson Membranes

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