UF spiral

The ultrafiltration spiral membranes from Alfa Laval are based on a unique construction of either polypropylene or polyester support material in a hygienic full-fit design that provides optimum cleaning conditions. The spiral membranes are available with different ultrafiltration membrane types and in different combinations of length, diameter and feed spacer size

Spiral wound membrane UF

The pores of the membranes used for Alfa Laval ultrafiltration spiral membranes are small, having a cut-off range from 1,000 to 100,000 molecular weight (MWCO), and the applied pressure is relatively low. Salts, sugars, organic acids and smaller peptides pass through the pores of the membrane, whereas proteins, fats and polysaccharides are retained.

Using appropriate ultrafiltration membranes also makes it possible to fractionate a feed stream into two distinct streams, with each stream containing dissolved components with different molecular weights.

The Alfa Laval ultrafiltration spiral membranes are a popular choice for many processes applied in the food, beverage, dairy, biotech and pharmaceutical industries where they are used for product recovery for example of an active from fermentation broth, as well as product purification, fractionation and concentration.

Alfa Laval offers a comprehensive range of spiral membranes with different characteristics and properties.

Dairy series 

For dairy applications Alfa Laval offers two series of tailor-made spiral membranes: The Dairy UF-PE series and the Dairy UF-pHt series. The spiral membranes of these series are USDA approved.

The dairy UF-PE spiral membrane, which is manufactured with polyester support material, is available with MWCO values between 5,000 and 20,000 dalton.  

The dairy UF-pHt spiral membrane, which is cast on polypropylene backing paper, is available with MCWO values between 5,000 and 20,000 dalton.

ETNA series

The ETNA spiral membrane is made of composite fluoro polymer cast on polypropylene (PP) backing material. The ETNA spiral membrane is available in two different types with a molecular weight cut-off value (MWCO) of either 1,000 or 10,000 dalton.

FS series

The FS spiral membrane is also made of composite fluoro polymer cast on polypropylene backing material. The FS spiral membrane has a MWCO value of 100,000 dalton.

RC-PE Series

RC-PE series

The RC-PE spiral membrane is made of regenerated cellulose cast on polyester support material. The RC-PE spiral membrane has a MWCO value of 10,000 dalton.

RC-PP series

The RC-PP spiral membrane is made of regenerated cellulose cast on polypropylene support material. The RC-PP spiral membrane has a MWCO value of 10,000 dalton.

UF-PE series

The UF-PE spiral membrane is made of either polysulphone or polyethersulphone cast on polyester support material. The UF-PE spiral membrane is available in different types with MWCO values ranging from 5,000 to 25,000 dalton.

UF-pHt series

The UF-pHt spiral membrane is characterized by its tolerance towards high pH and temperature. It is made of polysulphone or polyethersulphone cast on polypropylene backing material. The UF-pHt spiral membrane is available in different types with MWCO values ranging from 2,000 to 100,000 dalton.

UFX-pHt series

The UFX-pHt spiral membrane is characterized by its ability to tolerate high pH and temperatures. The membrane, which is cast on polypropylene support material, is made of polysulphone, permanently hydrophilic. The UFX-pHt spiral membrane has a MWCO value of 10,000.


  • cost-effective operation due to low energy consumption
  • long life time compared to traditional dead-end filtration  
  • cover a broad spectrum of flux properties and pore sizes
  • available in different combinations of length, diameter and spacer size 
  • sanitary design with all materials in compliance with EU Regulation (EC) 1935/2004, EU Regulation 10/2011 and FDA regulations (CFR) Title 21
  • same membrane types available as both flat sheet membranes and spiral membranes
  • suitable for extensive range of processes
  • manufactured by Alfa Laval's own membrane centre
Ultrafiltration spiral membrane from Alfa Laval


La technologie de base de la filtration membranaire consiste à utiliser une membrane semi-perméable pour séparer un liquide en deux flux distincts.

Le pompage de ce liquide à la surface de la membrane crée une pression transmembranaire positive qui permet le passage de tout composant plus petit que la porosité de la membrane, formant ainsi le perméat.

Tous les composants plus grands que la taille des pores ne peuvent tout simplement pas passer, et restent derrière dans ce que l'on appelle le rétentat. La surface de la membrane est maintenue exempte de blocages par la force du débit du liquide qui s'écoule parallèlement à la surface de la membrane.

Une membrane à spirale se compose d'un certain nombre d'enveloppes de membrane avec 2 feuilles de membrane séparées par une maille d'espacement pour perméat, chacune collée à un tube collecteur central de perméat.


Entre chaque paire d'enveloppes se trouve un espaceur qui crée le canal d'alimentation, permettant à l'alimentation de s'écouler sur toute la longueur de la membrane à spirale, tandis que le perméat passant à travers la membrane, dans son enveloppe, s'écoule à spirale vers le tube collecteur de perméat.

Rouge = Alimentation/rétentat.

Jaune = Perméat.