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THE LEADING MATERIAL

Needle felt filter bags

The needle felt filter bags are mostly made of synthetic fibers. The requirements that can be placed on the hose depend primarily on the type of filter fiber. Specially developed materials can withstand high operating temperatures and are also resistant to very aggressive chemicals. The properties and durability of a filter bag are largely determined by the composition, structure, surface treatment and thickness of the material (weight).

From many years of practical experience in filter technology, FAVORIT draws on its know-how to select the right material combination for your needs from the wide range of fibers available.

 

Material
sour
alkaline
organic solvents
permanent temperature
note

M-Aramid

(Nomex©)

no yes yes 220 °C Use only recommended with acid and hydrolysis resistant equipment

Polyacrylnitril

(PAC)

yes no yes 125 °C acid and hydrolysis resistant satisfactory resistance to alkalis

Polyester

(PES)

yes no yes 150 °C well proven due to the good properties of the polyester fiber not resistant to hydrolysis moderately resistant to alkalis

Polypropylen

(PP)

yes yes no 95 °C very good mechanical strength acid and alkali resistant

Polyimid

(P84©)

yes no yes 260 °C conditionally resistant to hydrolysis

PTFE

(Teflon©)

yes yes yes 260 °C resistant to almost all chemicals
Glass yes yes yes 260 °
unstable to hydrofluoric acid otherwise moderate to good chemical resistance Resistance