Filter & Anlagenbau Vollert KG

Filtermedia

Filter tubes made of needled felt

The needled felt filter tubes are mainly made of synthetic fibre. The standard of a filter tube depends largely on the kind of the filter fibres. Special designed materials can stand very high running temperatures and are resistant against agressive chemicals.

Qualities and durability of a filter tube depends on composition, structure, surface treatment and the thickness of the material. Because of many years of practical experience in filter technology, FAV is your partner to check out the perfect combination of materials for your individual solution.

Application under following conditions

Material acid alkaline organic
solvent
constant
temp.
remark
Meta-Aramide
(Nomex)
no yes yes 220°C not hydrolysis resistant,low acid restistant, highly restistant against alkaline
Polyacryl-
nitrile
yes no yes 125°C resistant against acid and hydrolsis satisfactory resistant, against alkaline
Polyester yes no yes 150°C best proved because of the quality of polyester fibre , but not hydrolysis resistant moderate resistant against alkaline
Poly-
propylene
yes yes no 95°C very high mechanical stability acid and alkaline resistant
Polyimide (P84) yes no yes 260°C hydrolysis resistance depends on special conditions
PTFE
(Teflon)
yes yes yes 260°C resistant against nearly all chemical agents
Fibre Glass yes yes yes 260°C nonresistant against hydroflouric acid, good chemical resistance

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