Eastman

Selecting the best polymer for membrane filtration

Eastman cellulosic membrane materials are especially advantageous when filtering process streams that are highly fouling. In addition, these materials offer economical options compared to other alternative polymers.

The following chart is a general comparison of polymers commonly used to make membranes.

Material pH range Cost Tensile strength, mPa Oxidant resistance,
ppm hours of chlorine
Strengths Weaknesses
Cellulosic derivatives
(CA, CDA, CTA)
Narrow,
4–9
Low
Moderate,
30–60
High,
>104
High fouling resistance; low cost; highly hydrophilic
Lower flux rates; limited pH range
Polyamides
Wide,
2–11
High
High,
130–150
Low,
<500
High mechanical strength; very high rejection level
Destroyed by chlorine;
prone to biofouling
Fluorinated polymers (PVDF)
Moderate,
2–10
High
Moderate,
30–60
High,
>104
Chlorine resistant; moderate to high rejection level
High cost; difficult to produce; hydrophobic
Polysulfone and polyester sulfone
Wide,
1–13
Moderate
Moderate
to high,
70–90
Moderate,
<104
High rejection level; wide pH range; high temperature resistance
Limited tolerance to chlorine


Choosing the right material

© 2022 Eastman Chemical Company or its subsidiaries. All rights reserved.
As used herein, ® denotes registered trademark status in the U.S. only.