About Use Notes and Commonly Used Filter Membranes for Solvent Filter

We can see glass solvent filters in many different industries, including sanitary inspection, chemical analysis, biological products, scientific research, environmental monitoring, and pharmaceutical industry, and so on. To be more specific, it can be used for oil field water injection, analysis of suspended solids concentration, membrane filtration coefficient, particle diameter, and sterility test, culture bacteria sterilization filtration.

The solvent filter consists of a filter bottle device and a vacuum pump. Filter bottles include triangular liquid collection bottles, sand core filter heads, filter cups, and fixing clips. The filter bottle is mass-produced, not only the appearance is exquisitely made, and the wall thickness uniform, but also the interchangeability is good. Designed for the filter bottle device, with high efficiency and low noise, the oil-free vacuum pump is a compact and practical design, which is easy to operate.

vacuum filtration 300ml Glass Solvent Filters Supplier 300ml Glass Solvent Filters Packaging

Basic operating notes of solvent filter

1. The solvent filter is a fragile product and must not be moved as a whole, especially with a clamp.
2. Choose a qualified filter membrane, otherwise, it will dissolve impurities. Check if there is any dissolution by soaking the solvent for 24 hours.
3. Water filtration, organic membranes are used for organics and then mixed after filtration. Which membrane is used in which proportion of the mixed mobile phase to use?
4. The membrane does not matter anyway, but the smooth side is up, and the coarse side is down. The filtering effect will be better.
5. It’s not allowed to throw the filter membrane away at will. The filter membrane pollutes the environment, so it is not suitable for a solution. Collect unified processing.
6. Do not pull out the hose after the liquid is empty when the supporting oil-free vacuum pump pumps air. It is not advisable to pull out, it will squash the hose, and stop the pump when there is a little liquid left.

Characteristics of commonly used filter membranes for solvent filter

The solvent filter is a commonly used equipment in chemical laboratories. It is used to filter and degas the mobile phase in liquid chromatography analysis. It plays a key role in extending the service life of the instrument and the chromatographic column and improving detection accuracy. With different aims, the solvent filter will be equipped with different filter membranes.

Solvent filter membrane common filter material characteristics

1. PTFE filter membrane
With excellent chemical compatibility, the PTFE membrane is able to guarantee the unimpeded passage of moist air or other gases and filter strong corrosive chemicals. Pre-soaking in ethanol or isopropanol is required if the PTFE membrane must filter the water phase solution.

2. Glass fiber pre-filter membrane
As a kind of deep filtration, the main purpose of the glass fiber pre-filter membrane is to pre-filter and add to the membrane directly, with the function of filtration rate and continuous filtration improvement.

3. Nylon filter membrane
With excellent mechanical strength and absorption, a nylon filter membrane is used for the filtration of alkaline solutions and organic solvents. For organic solvent filtration, such as HPLC mobile phase particle removal filtration, nylon membranes are more economical and practical than PTFE membranes. Due to the relatively high adsorption performance of nylon membranes, it is generally not recommended to filter biological samples such as culture media or protein liquids to avoid the loss of samples due to adsorption. In this case, a low-adsorption cellulose acetate membrane (CA) is usually more suitable.

4. PVDF filter membrane
It has good heat resistance and chemical stability, is anti-corroded with strong oxidants and halogens, and acids, alkalis. Because of the low protein adsorption capacity, hydrophilic PVDF is frequently in sterilization filtration in biopharmaceuticals and it can be used to remove endotoxins for positively charged PVDF.