Stable Properties and Precautions in Application of Membrane Filter

As a kind of physical separation method, the membrane filtration process is able to separate molecules of different sizes and characteristics by the driving force from the differential pressure between the two sides of the membrane filter. Membrane filtration can help the scientists in the lab save the cost of production, and boost its quality as well. Based on the membrane filtration principle, Hawach supplies Polypropylene membrane filter, microporous glass fiber membrane filter, and PVDF Membrane Filter.

The membrane filtration principle is known as the process of the permeate and the retentate, in which a single feed stream can pass through a membrane system that separates it into two streams. The membrane filter is the key to the system which acts like the physical barrier that only allows certain components in the feed stream can go through.

Specific pore size ratings, known as, membrane filters work as microporous plastic films, retaining the particles which are larger than their pore size. The smaller particles can be retained by other mechanisms.

The liquid or gas which will be filtered determines what kind of membrane filters you should use. You need to check which membranes are chemically compatible with the feed stream. The pore size is also should be considered to get the results you desire. Don’t forget to check the membrane filters for any unusual process conditions which limit the use of a membrane, such as a temperature.

Good Hydrophilicity and Corrosion Resistance

Hawach Scientific nylon microporous membrane is aliphatic nylon, which provides good hydrophilicity and resistance to acid and alkali. It is not only suitable for an aqueous solution containing acid and alkali, but also suitable for organic solvents. The material is aliphatic nylon, which has good hydrophilicity and resistance to an appropriate concentration of acid and alkali.

Moreover, it is suitable not only for an aqueous solution containing acid and alkali but also for organic solvents. The principle of pore size selection is the same as the mixed fiber membrane, that is, nominal pore size varies from 0.65 um、0.45um、0.3um、0.22um, and 0.1um, and the diameter is available in 100 mm、150mm、200mm、300mm and 400mm.

Stable Chemical Properties

Hawach membrane filter is suitable for the filtration of aqueous solution and most organic solvents and is suitable for the preparation of many biological agents and other unusable situations. Hawach nylon membrane filter is hydrophilic and it does not need to be pre-wet with extractable solvent when filtering an aqueous solution. And it has flexibility, durability, tear, and other properties, and can be sterilized at 121℃ under high pressure. If soaking the filter membrane at room temperature with the various chemical solutions for 72 hours, the appearance of the membrane filter occurs with no expansion, dissolution, deformation, destruction, or deterioration.

Precautions in Application of Membrane Filter

In order to protect and prolong the service life of the filter membrane, filter paper, or silk cloth of the same size can be placed on the membrane filter to prevent the membrane from breaking. Furthermore, it is better not to sterilize the filter frame together with the filter membrane; otherwise, the filter membrane is brittle and crumpled due to thermal expansion and contraction. And membrane filter should not be soaked in water for a long time, or the filtration performance will be greatly reduced.