Membrane filters you need to know and their properties

Membrane filters

Membrane filters you need to know and their properties

Cellulose acetate Membrane filters or commonly known as membranes are micro porous membranes with specific pore size ratings. It is also called a sieve, micro porous filter or screen. Membrane filters retain or filter particles larger than the pore size. If there are particles smaller than the pore size, other mechanisms will be used. There are different types of membrane filters, such as nylon, cellulose acetate, mixed cellulose ester or MCE membrane filters. Here is more information Cellulose acetate membrane filter and their properties.

The mixed cellulose ester

MCE is composed of cellulose acetate and nitrocellulose. It has a high porosity and can provide a higher flow rate. It also has a high level of protein binding, which can be prohibited by pretreatment or application. MCE is a standard membrane that can be used in many laboratory applications, such as filtration and sterilization of biological fluids, pollution analysis, microbiology and air monitoring. The membrane can become transparent to view the particles collected during the filtration process.

The cellulose acetate

Coated cellulose acetate consists of cellulose acetate cast on a non-woven polyester carrier. It has a non-fiber releasing ability, and the protein binding level associated with nitrocellulose is low. It also has a low level of static charge and chemically enhances compatibility with low molecular weight alcohols. The coated cellulose acetate is used as a pre-filter or clarification filter.

Hydrophilic PTFE

Hydrophilic PTFE has properties described as having the highest resistance to chemicals and pH. The membrane has a high level of flow rate and almost no water ex tractable. When the film is wetted with water, it is transparent to the naked eye, so it is very suitable for use in HPLC, organic solvents and other aqueous mixtures.


PTFE The characteristic of hydrophobic PTFE is that it has a high porosity, is very thin, and behaves like a monolithic retention membrane. It also has a passive effect on most corrosive chemical solvents, alkalis and strong acids. The membrane traps water-containing aerosols by sterilizing the gas. It is also used for gas and air discharge, so that gas can freely pass through the membrane, and at the same time prohibits liquid from entering. This protects critical samples and vacuum pumps. In addition, hydrophobic PTFE clarifies and sterilizes strong acids and other solvents that are incompatible with other membrane filters.


Nylon membrane filters are made by impregnating a polyester fiber web with a polymer made of nylon. This makes the membrane durable, heat-resistant and essentially hydrophilic. Because it is hydrophilic, it is suitable for alcohol and aqueous samples. The membrane filter can be used to sterilize, filter and clarify organic aqueous solutions.

Cellulose acetate

The membrane filter is composed of dictate and cellulose triacetate. It is characterized by high strength and low static charge. The advantage of using it is that it can be repeatedly disinfected without losing its integrity or changing its bubble point. Related to MCE membrane filters in terms of their solvent resistance to alcohol molecular weight increase at low levels. It also has better heat resistance and lower protein binding. Cellulose acetate is used to enhance the recovery of positive organisms and filter enzyme solutions. It is also used for cytological diagnosis and receptor binding research.

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About the Author: Barry Lachey

Barry Lachey is a Professional Editor at Zobuz. Previously He has also worked for Moxly Sports and Network Resources "Joe Joe." he is a graduate of the Kings College at the University of Thames Valley London. You can reach Barry via email or by phone.