Membrane filtration utilizes pressure to force water of any other type of carrier fluid through a porous or semi-permeable membrane. This whole process separates the particulate matter that is suspended from the soluble and fluid components. Membrane filters are known as membranes, microporous films, which each have specific ratings for their pore sizes. These are known as microporous filters, too, screens or sieves, and they keep microorganisms and particles which are usually bigger than the size of their pores through surface capture. There are various types of filters for these membranes that are used differently in laboratories. Read on to learn more!
Kinds of Membrane Filters
There are different kinds of membrane filters available. Different companies and manufacturers creature different products. It is best to learn about these types so you know which will suit your needs the best. If you need help figuring out which ones work best, give the Lab People a call for assistance.
Mixed Cellulose Esters
These filters include cellulose acetate as well as cellulose nitrate. They are highly porous, pure, and have a quick wetting time too. These are standard membrane filters that are used for different applications in labs – such as air monitoring, contamination analysis, sterilization of biological fluids, and microbiology.
These filters include cellulose triacetate and diacetate. They are sterilizable, have high strength, and a lower static charge. You can use these types of membrane filters for applications like diagnostic cytology, filtering enzyme solutions. Studies that involve receptor binding and enhanced recovery of some gram-positive, fastidious organisms use this membrane filter.
Coated Cellulose Acetate
These filters include cellulose acetate that is cast onto the polyester support that is non-woven. These membrane filters also have a lower static charge matrix along with an improved chemical compatibility. These filters are typically used as a clarifying filter or prefilter.
These kinds of filters have maximum pH and chemical resistance. While wet, they are optically clear, and they provide high flow rates. You can use these types of membrane filters for HPLC and other kinds of mixtures of organic and aqueous solvents.
These filters are very porous, thin, and behave as absolute retentive membranes. They remain inert even with stronger bases, acids, and solvents – which can be chemically aggressive. You can use these kinds of membrane filters for sterilizing gases, venting gas, and air or clarifying and sterilizing stronger solvents or acids that are not compatible with other types of membrane filters.
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