The Differences Between Nylon Membrane Filters And MCE Membrane Filters
Membrane filtration is a kind of physical method of separation through a very thin filter medium to separate molecules of various sizes and characteristics. Also called surface filtration, it can separate the solid particles which are usually large compared to the pore size of the membrane. As the shapes of the pores on the surface are not regular, the rejection of particles is based on its physical size, charge, or affinity or a combination of these properties.
Playing like a physical barrier, the membrane can separate the samples, and only certain selected components can pass through. At the same time, the membrane filter can reject the large particles which don’t have the chance to go into the interior of the filter.
The advantage of the membrane filtration is well known as fewer processing steps and higher separating purity. Hawach has two types of filter membranes available for you: round disc membrane filters and roll type membrane filter, for the filtration and sterilization of liquids, gas and etc..
First of all, the nylon membrane filters are hydrophilic and they are alkali-resisting but not acid-resisting. Also, the nylon membrane filters are difficult to be corroded in the ketone, phenol, ether, and alcohol of high molecular weight. In addition, the nylon membrane filters have very good mechanical strength and thermal endurance properties. They have the strong adsorbed ability and can tolerate most of the organic solvents and alkaline solutions. Generally, the nylon membrane filters are especially suitable for the filtration of alkaline solutions. And, they can be sterilized normally in the temperature of 121℃ without breaking the integrity of the membrane.
Hawach nylon membrane filter is aliphatic nylon, which has good hydrophilicity and resistance to the appropriate concentration of acid and base. It is suitable not only for the aqueous solution containing acid and base but also for organic solvents, such as alcohols, hydrocarbons, ethers, esters, ketones, benzene, and benzene homologs, dimethyl sulfoxide and so on. The principle of pore size selection is the same as the mixed fiber membrane, that is, the removal of particles using nominal pore size um, sterilization using nominal pore size 0.65 um、0.45um、0.3um、0.22um、0.1um, diameter:100 mm、150mm、200mm、300mm、400mm.
This product should be cleaned before use, soaked in distilled water after washing in the filter, organic solvent filtration with ethanol to wash. For high-requirement applications, for example, chromatographic sample or reagent filtration, if the water system, distilled water after washing, then distilled water pre-filtration, if organic filtration, so that the product in pure toluene and more than 95% ethanol soaked overnight, then pure toluene and pure ethanol pre-filtration, thoroughly washed after the use of the membrane.
When referring to MCE membrane filters, they are some kind of standard filters that are frequently used in the laboratories and made of mixed cellulose esters. On the whole, the MCE membrane filters have excellent pore-formed property, good hydrophily, and low protein adsorption ability. In addition, the raw materials are easy to get at low costs. In general, the MCE membrane filters are mostly applied in chemotaxis and cell retention as well as particulate collection. Also, they are used for the ultrafiltration of all kinds of solutions, measuring light scattering and sterilization of water solutions, buffer solutions, serum, and culture medium.