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A. GEZANG & CO BV - Westvlietweg 65-P, 2495 AA Den Haag. Holland.

Tel. +31-20-682 22 55 Fax +31-20-682 82 46

Innovative precoat filteraid made of processed high density polyethylene microscopic fibres with superior chemical resistance over commonly encountered alpha-cellulose fibre based precoat filteraid powders.

Precoat filteraids are applied on the filter hardware septum - most commonly a coarse metal mesh screen or woven cloth - to form a first porous mat on the woven septum, in order to protect it against the penetration of unwanted solids and premature blinding. Microscopically fine fibres have proven most effective to interlace, bridge and overlay the coarse openings of filter screens, yet are easy to remove with CIP or by hand.

Once the precoating is completed, a bodyfeed dosage of diatomaceous earth (a highly porous grinded fossil silica, also called kieselguhr) or perlite (a grinded volcanic rock) is added to the unfiltered liquid. The liquid is then pumped through the precoat and the supporting septum, that combined traps both impurities and bodyfeed. The solids continuously build up a cake on the surface until the space between adjacent screens is filled or the pressure difference between filter inlet and outlet reaches a maximum. The filter cake can become centimetres thick, and at the end of filtration - thanks to the non-stick properties of the 1.5 to 3 mm thin precoat - can be easily removed from the screens by means of an automated CIP-system or spraying by hand.  

General technical information:

Fibre type:       PE  fibres

Material:          HD-Polyethylene   

CAS-No:          9002-88-4

Wetting Agent  PVA (CAS-No.: 9002-89-5)

The fibre product is not toxic.

It may contain up to 2,5 % polyvinylalcohol, which is not soluble in water.

FDA - Food & Drug Administration  Approved

BGA - Federal safety office   Approved

Specific Weight:                           0,96 g / cm3

Crystaline Melting Point: (approx). 132 degrees C.

Decomposition Temperature          330 degrees C.

Acid Resistance:       Decomposes only in strong oxidising acids

Alkali Resistance:     Good

Solvent Resistance:   Slight swelling in hydrocarbon and chlorinated

                               Hydrocarbon (temperature dependent).


S.E & O , Copyright A. Gezang & Co BV 2008