Microfiltration is a pressure-driven process in which a membrane is applied to separate particles from an aqueous solution. The function of microfiltration in principle is as same as that of reverse osmosis, ultrafiltration and nanofiltration. The difference lies in terms of retention of the size of molecules.

Mechanism and Properties of Microfiltration

Microfiltration is loosely defined as a membrane separation process using membranes with a pore size of approximately 0.1 to 10 micrometers and a molecular weight cut-off (MWCO) of greater than 1000,000 daltons. Materials removed by MF include sand, silt, clays, Giardia lamblia and Crypotosporidium cysts, algae, and some bacterial species. MF is not an absolute barrier to viruses. Typical operating pressure for microfiltration is relatively low, lying between 0,7 bar and 7 bar.

 The materials used for making microfiltration membranes are natural or synthetic polymers like cellulose nitrate or acetate, polyvinylidene difluoride (PVDF), polyamides, polysulfone, polycarbonate, polypropylene etc.

 Microfiltration membrane should be selected keeping following aspects in mind: Mechanical strength of the membrane, Their resistance to temperature,  Chemical compatibility of the membrane, Hydrophobility, Hydrophilicity and Permeability of the membrane, Cost and the manufacturing process of the membrane material.




AMFOR’s Spiral wound microfiltration membranes offer excellent performance in various applications. Feed water at a relatively high flow is pumped at a pressure of 10-50 psi along the membrane surface.  A small amount (5-10%) of the water goes through the membrane.  The balance of water goes to the next membrane element or is recycled back.  In addition, a small amount of concentrate is removed from the system.  This cross-flow process helps minimize the fouling of the surface of the microfiltration membrane. 

AMFOR’s MF Sanitary spiral wound membrane elements are available with:

  • Material: PES, PVDF
  • Membranes with various MWCO:  0.1um , 0.2um , 0.3um
  • Various diameter (3.8-10.3 inches)
  • Various lengths (33-56 inches)
  • Various feed spacers (24-80 mil)
  • Special design for high pH/high temperature   

AMFOR’s Sanitary spiral wound membrane benefit to you:

  1. Designed for maximum durability and long life.
  2. Conform to 3-A, FDA, and USDA standards
  3. Available in standard diameter sizes or customized configurations for a wide range of applications. 
  4. High resistance to fouling.



  General Information

 MF-PES Series (Food, Dairy, Pharmaceutical and Biological Applications)  

  MF-PVDF Series (Electrocoat paint recovery, Textile size recovery, Clarification Applications)