High Strength, Long Life Sterilizing Filters for Air and Gas
Emflon® PFR filters have been developed from the successful Emflon filter range launched in 1981 and widely used as air and gas sterilizing filters in the pharmaceutical and biotechnology industries. The double layer PTFE membrane is inherently hydrophobic, chemically inert and designed specifically for removal of contaminating bacteria and viruses. Emflon PFR filters meet the ever increasing demand for air filters with greater strength, longer life and the ability to withstand the rigours of in-situ steaming in the forward or reverse direction.
Emflon PFR filters provide high assurance of filter integrity and long life, even during continuous use in hot air up to 60°C, in vent applications up to 80°C and during repeated steaming. The filters can withstand up to 1 bar (14.5 psi) differential pressure (forward direction) under steam sterilization conditions (125°C). This is combined with high flow rates and excellent dewetting characteristics resulting in very economical filtration through the use of smaller installations and reduced energy costs. In addition, the filters can be tested in-situ by the Forward Flow integrity test or by a Water Intrusion test. Both tests are correlated to liquid bacterial challenge - the ‘worst case’ challenge.
Emflon PFR filters have been extensively and scientifically validated using the most advanced methods and the most sensitive equipment available. They have an absolute removal rating of 0.2 µm in liquids and 0.003µm in gases and have been validated by:
Brevundimonas (Pseudomonas) diminuta liquid challenge at 107/cm2
Airborne sodium chloride aerosol challenge at 100 L/min flow (0.003 µm rated in gases).
Features and Benefits
Comprehensive validation assures highest removal efficiency and highest safety margins. High flow rates and low pressure drop allow use of small systems, reducing installation and running costs. Robust construction ensures integrity and reliability. Long steaming life and long service offer low cost filtration.
Click here to download an article which describes studies on removal efficiency and resistance to steam sterilization of Emflon PFR filters (PDF, 75 kb)
Polymeric, encapsulated in oxygen-resistant polypropylene
Silicone elastomer 1
1 Other materials available on request
<0.003 µm, particulate 2
0.2 µm, sterilizing 3
2 By NaCl CNC particle analysis. Also retains 100 % of Brevundimonas diminuta bacteria, bacteriophage and virus aerosols. 3 Lot samples of assemblies retain >107 cfu/cm2 of Brevundimonas diminuta in liquid per mod. ASTM F838-83 and FDA guidelines.
Configurations (AB Code 7) 4
Single open ended
Double 226 O-ring adapter
Finned end, bayonet lock
4 AB05 style is Code 2 flat end. Other adapter codes available.
127 mm (5 in.), 254 mm (10 in.), 508 mm (20 in.), 762 mm (30 in.), 1016 mm (40 in.)
70 mm (2.75 in.)
Filter Area (Nominal)
0.8 m2 (8.6 ft2) per 254 mm (10 in.) element
0.4 m2 (4.1 ft2) per 127 mm (5 in.) element
Maximum Differential Pressure
5.3 bar (77 psid)
4.1 bar (60 psid)
5 In air/N2 service or other compatible gases.
Typical Continuous Air Service Life6
12 months to 60°C
6 For continuous air flow above 60 °C, Emflon HTPFR filters are recommended. Emflon PFR can be operated at higher temperatures for shorter time periods.
Typical Vent Service Life
6 months to 80 °C
Typical Air Flow Rates
Cumulative Steaming Time8
165 hrs (1 hr cycles) to 142 °C
Maximum Forward Steaming Conditions
1.0 bard (14.5 psid) at 125 °C 0.3 bard (4.4 psid) at 142 °C
Maximum Reverse Steaming Conditions
0.5 bard (7.3 psid) at 125 °C 0.2 bard (3.0 psid) at 142 °C
8 Lab tests to establish multi-cycle resistance. Filters should be qualified in actual use. Contact Pall for recommended procedures.
Aqueous Extractables (20°C)
<5 mg per 254 mm (10 in.) element after 1 hour steam at 125 °C
Meets USP Biological Reactivity, In Vivo, for Class VI-121 °C plastics
Effluent Quality Tests 9
Meets Cleanliness per USP Particulates in Injectables. Non-Fiber-Releasing per 21CFR Non-Pyrogenic per USP Bacterial Endotoxins (<0.25 EU/mL) Meets Oxidizables and pH per USP packaged waters
Lot samples multicycle autoclave challenged
9 Per lot sample soak or rinse-up flush aliquots
Integrity Test Values per 254 mm (10in.) Cartridge 10
10 Contact Pall for multi-element values. AB05PFR value is 7.8 cc/min.
Part Number 11
AB Style Code 12
127 mm (5 in.)
254 mm (10 in.)
508 mm (20 in.)
762 mm (30 in.)
1016 mm (40 in.)
11 P at end of part number indicates optimized and qualified for Pharmaceutical use including encapsulated stainless steel reinforcing adapter ring for steaming in situ, 100% integrity testing and Certificate of Test provided. V indicates optimized for vent/air/gas service. H4 suffix=Silicone O-rings (standard). See Appendix for available alternate O-ring polymers and codes.
12 AB05 standard with Code 2 flat cap, other lengths Code 7 with finned cap. Both with double 226 O-rings.
Note: For sizing filters or other information, please contact your local Pall distributor.
Specifications and Availability: The information provided is a guide to the part number structure and possible options. Product availability may be subject to change without notice. All specifications are nominal. This literature was reviewed for accuracy at the time of publication. For current information on the products and test methodologies, consult your local Pall distributor.