Membrane Spotlight: Asymmetric Membranes

Learn about asymmetric membranes in prefiltration and fluid clarification applications

April 1, 2022

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Asymmetric filter membranes provide fast and consistent flow rates in applications such as prefiltration and clarification.  These membranes are different from conventional microporous membranes in that the larger pores on the upstream side of the membrane acts as a prefilter, capturing larger sized particulate while maintaining throughput and low pressure drop, whereas the absolute rated downstream side, or exclusion zone, acts as an absolute cut off layer.  This is in contrast to traditional microporous grades which have comparable pore sizes on both the upstream and downstream sides of the membrane.  The graded nature of asymmetry results in a sidedness to the membrane, requiring knowledge of the upstream side of the membrane for optimal performance in the application.

 

Below is a high-level comparison of membranes according to these attributes:

 

 

 

Asymmetric

Microporous Membrane

Conventional Microporous Membrane Nominally rated Depth Membrane
Absolute rated pore size YES YES NO
High flow rates per area YES NO NO
High particulate loading capacity YES NO YES

 

 

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Jacques Hestres, Product Manager for Media – Membrane at Pall Corporation

Focusing primarily in Medical OEM applications. Throughout his over 25 years at Pall, Jacques has held various positions in Customer and Technical Service, Operations Planning, and Product Management. This experience has given him the knowledge of the products, the manufacturing processes used to produce these materials, and an understanding of applications where these are used. Jacques holds a Bachelor’s of Science Degree in Biology from the University of Puerto Rico.
Focusing primarily in Medical OEM applications. Throughout his over 25 years at Pall, Jacques has held various positions in Customer and Technical Service, Operations Planning, and Product Management. This experience has given him the knowledge of the products, the manufacturing processes used to produce these materials, and an understanding of applications where these are used. Jacques holds a Bachelor’s of Science Degree in Biology from the University of Puerto Rico.
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Joseph Vickers - Portfolio Lead, Membrane & Media

A Global Portfolio Leader at Pall Corporation, responsible for the Membranes and Media portfolio. He has previous experience in global marketing and operations, holding an MEng in Chemical Engineering from the University of Surrey.
A Global Portfolio Leader at Pall Corporation, responsible for the Membranes and Media portfolio. He has previous experience in global marketing and operations, holding an MEng in Chemical Engineering from the University of Surrey.
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Antoine Pozniak - Product Manager Media - Membrane at Pall Corporation

Antoine has held various roles in sales and marketing throughout his 4-year career in the medical device industry. Throughout those 4 years he has worked with Key Opinion Leaders and developed commercial and technical expertise. Antoine holds an MBA from Rice University and Bachelor of Arts/Sciences in Interdisciplinary Social Sciences from The University of South Florida.
Antoine has held various roles in sales and marketing throughout his 4-year career in the medical device industry. Throughout those 4 years he has worked with Key Opinion Leaders and developed commercial and technical expertise. Antoine holds an MBA from Rice University and Bachelor of Arts/Sciences in Interdisciplinary Social Sciences from The University of South Florida.
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