ePTFE Membrane Cartridge Filters

Fluorofil™ cartridges are manufactured using a highly hydrophobic ePTFE membrane. The enhanced ePTFE membrane offers exceptionally high gas flow rates at low pressure differentials (see graph). Fluorofil™ cartridges are recommended for sterile gas filtration and venting applications. The hydrophobic characteristics of the ePTFE membrane makes the Fluorofil™ filter cartridge particularly suitable for wet gas sterilising applications, such as fermenter air feed.

Features and Benefits

  • Guaranteed microbial ratings in a liquid challenge
    Fluorofil™ cartridges are validated for bacterial removal in liquids in accordance with PDA, HIMA guidelines and ASTM F838-05, with a log reduction value >7. This test is stringent in comparison to an airborne particulate challenge test.
  • Bacterial spores and viruses
    The retention of bacterial spores and viruses carried in aerosols over extended time periods has been independently validated in tests carried out by the UK Health Protection Agency.
  • Flow ΔP characteristics
    The unique characteristics of the ePTFE membrane, combined with the construction of the Fluorofil™ filter cartridge, results in exceptionally high gas flow rates at low pressure differentials. These features result in lower energy consumption and fewer filter cartridges per system.
  • Steam sterilisation
  • Cartridge integrity and low TOC levels
  • Solvents and aggressive chemicals

Materials of Manufacture

Filter membrane: ePTFE
Membrane support: Polypropylene
Irrigation mesh (support): Polypropylene
Drainage layer: Polypropylene
Inner core: Polypropylene
Outer support: Polypropylene
End fittings: Polypropylene
Sealing: Fusion bonding

Maximum Differential Pressure

Normal flow direction at:
20°C (68°F): 6.0 bar (87lb/in2)
80°C (176°F): 4.0bar (58lb/in2)
100°C (212°F): 3.0 bar (43lb/in2)
120°C (248°F): 2.0 bar (29lb/in2)
125°C (257°F): 1.5bar (22lb/in2)
Reverse flow direction at:
20°C (68°F): 2.1bar (30lb/in2)
80°C (176°F): 1.0bar (15lb/in2)
100°C (212°F): 0.5bar (7lb/in2)

Gaskets and O-Rings

Ethylene Propylene, PTFE encapsulated, Silicone or Nitrile.

Effective Filtration Area

Absolute Microbial Rating Effective Filtration Area (each 254mm (10") module)
0.02, 0.1, 0.2 and 0.45μm 0.73m2 (7.8ft2)

Operating Temperature

Maximum continuous: 80°C (176°F).


In situ steam 100 x 20 minute cycles at 135°C (275°F) to 150 x 20 minute cycles at 125°C (257°F).


  • Sterile process gases
    The supply of sterile gas for critical applications in the pharmaceutical, biotechnology, food and beverage markets.
  • Sterile vents
    The safe sterile venting of processing vessels in pharmaceutical, fermentation, and food and beverage processes.
  • Fine chemicals and solvents
  • Photoresists and developers
    The microfiltration of photoresists and developer solvents, susceptible to contamination and precipitation during manufacture, storage and processing.
  • Pure water supply systems

Flow Characteristics

  • Typical clean air flow rate:
    A 254mm (10”) Fluorofil™ single cartridge exhibits the flow-ΔP characteristics indicated below.
Gas Flow Rates


Clean Water Flow Rates


RR Retention Rating
MT Maximum temperature recommended of a working product in degrees centigrade
MoC Primary material of construction
MoC Primary material of construction
MP Maximum working pressure of housing in bar
Brand Manufacturing brand name supplying the product
FE Filter efficiency
Q Quality assurances and certificates validating this product