4" x 40" |PS Microfiltration Membrane Element | Polysulfone MF

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AMI Membrane Elements Microfiltration MF Nanofiltration NF Reverse Osmosis RO
4" x 40"  Microfiltration Membrane (MF Membrane) | Polyslfone (PS) | 20,000 MWCO

Applied Membranes, Inc. (AMI) polysulfone spiral wound microfiltration elements provide microfiltration with a molecular weight cut-off of 20,000 and are ideal for removal of suspended solids and clarification.   AMI Microfiltration Membrane elements are among the finest in the industry.  Since 1983, AMI PS MF Membrane elements have earned the reputation of consistent quality.  

AMI 4x40 Microfiltration Membrane is the industry standard 4x40 size, for universal fit into most standard 4x40 membrane housing pressure vessels.

AMI MF Membranes are Made in the USA in their ISO 9001:2015 Certified Facility and are 100% Quality and Performance Tested.

Genuine AMI Membranes ISO USA Quality



M-M4040PS20 Specifications

AMI Part Number: M-M4040PS20
Membrane Size (Nominal): 4 x 40
Membrane Dimensions: 3.9"Dia. x 40"L
Membrane Type: Microfiltration (MF) Polysulfone
Molecular Weight Cut-Off (MWCO) 20,000*
For Housing: Standard 4" x 40"
Outer Wrap: Tape Wrapped
Element Type: Spiral Wound
Element Style:

Standard / Male 
(with "stinger")
3/4" Male PWT
Manufacturer: Applied Membranes, Inc.
Country of Manufacture: United States (USA)

*Design Note: MWCO is defined as the molecular weight of the challenge material which the membrane rejects at a rate of 90% or better.

AMI Membranes Product Specifications

Features of AMI Polysulfone Microfiltration Membranes

  • Filtration to 20,000 Molecular Weight Cut-Off (MWCO)
  • Robust Materials and Construction for Long Life
  • Made in the USA
  • Manufactured in our ISO 9001:2015 Certified Facilities
  • 100% Performance and Quality Tested
  • Backed by our Experienced Technical Support Staff
  • High Quality for Consistent and Reliable Performance
  • Uses the most advanced membrane technology and manufacturing processes
  • Standard dimensions to fit in commonly available housings


Applications for AMI Polysulfone Membranes


  • Post-Treatment of ultrapure water
  • Removal of suspended solids
  • Process steam clarification, such as sugar solutions 


Physical Dimensions of M-M4040PS20:


Total Length (L):

40 In. (101.6 cm)

Membrane Length (I):

38 In. (96 cm)

Diameter (D):

3.9 In. (9.9 cm)

PWT (P):

0.75 In. (1.9 cm)


Replacement Compatibility for AMI  4 X 40 Microfiltration Membranes

Applied Membranes M-M4040PS20 MF membrane elements fit industry-standard 4x40 membrane housing pressure vessels and can be used as direct replacement for many industry-standard 4x40 size Microfiltration PS elements with 3/4" male product water tubes ("stinger style").