33 mm Non-sterile Millex Filter Units

33 mm Non-sterile Millex Filter Units Almost 20% more surface area than 25 mm filters Non-sterile Millex filter units are now available in a new, larger 33 mm housing with Millipore Express PLUS (PES), Durapore (PVDF) and nylon membranes.

Faster Flow Rate
The larger filter surface area increases flow rates. It also makes it easier to filter solutions because it reduces the pressure required to empty the syringe.


Low Hold-up Volume
Despite the increased membrane area, the hold-up volume (after air purge) has been reduced to 80 µL, a 20% decrease over 25 mm Millex filters.


Higher Operating Pressure
New 33 mm non-sterile Millex filters have a maximum housing pressure of 8.6 bar (125 psi), which means you can filter solutions faster than before.


Available with Three Membrane Types
Millex filters with Millipore Express PLUS membrane have the fastest flow rates and twice the throughput of standard 25 mm syringe filters. Durapore membrane has the lowest protein binding of any membrane and is recommended for filtering solutions containing proteins. Nylon provides broad chemical compatibility for general filtration of aqueous and organic solutions.


Low Extractables
The housing materials and membranes are low in extractables that can interfere with analytical analyses.


Automated Manufacturing Process
The 33 mm Millex filter manufacturing process is fully automated from membrane cutting through device assembly and packaging to minimize the risk of contamination.


Specifications    (return to top)

33 mm Millex Filters with Durapore Membrane 33 mm Millex Filters with Millipore Express PLUS Membrane 33 mm Millex Filters with Nylon Membrane Housing Material Polypropylene Polypropylene Polypropylene Filter Material Hydrophilic PVDF Hydrophilic polyethersulfone Hydrophilic nylon Inlet Fittings Female Luer-Lok® Female Luer-Lok® Female Luer-Lok® Outlet Fittings Male Luer slip Male Luer slip Male Luer slip Dimensions Filtration Area, cm2 4.5 4.5 4.5 Diameter, mm 33 33 33 Inlet to Outlet, mm 27 27 27 Process Volume, mL ≤100 ≤200 ≤100 Hold-up Volume, µL ≤80 after air purge ≤80 after air purge ≤80 after air purge Maximum Differential Pressure, bar (psi) 8.6 (125) 8.6 (125) 8.6 (125) Maximum Operating Temperature, °C 45 45 45 Bubble Point 0.22 µm ≥3.45 bar, air with water ≥4.3 bar, air with water ≥2.9 bar, air with water 0.45 µm ≥1.6 bar, air with water ≥2 bar, air with water ≥2.2 bar, air with water Typical Clean Water Flow Rate, mL/min at 25 °C and 2.1 bar (30 psig) (of Milli-Q® water) 0.22 µm 40 240 92 0.45 µm 300 480 169