4 Ways to Choose Best Glass Fiber Filter Membranes
As we all know, glass fiber filter membranes are laboratory filtration consumables, which have the characteristics of a high flow rate and strong dirt-holding capacity and are mainly for deep filtration. Today, here are some ways to choose them.
How to choose a glass fiber filter membrane:
1. According to size
Domestic basic filter membranes are divided into fast, medium, and slow.
Divided into finer ones, which generally have corresponding pore sizes, such as fiber filter membrane, the aperture: 0.45μm, 1.0μm, 1.6μm;
Diameter: 13mm, 25mm, 47mm, 50mm, 60mm, etc;
2. Purity of material
The quality of the filter membrane mainly depends on the purity of the cotton fiber, and it is best not to have additives.
Glass fiber material filter paper is 99.90% glass fiber material.
In addition, glass fiber filter paper has the characteristics of a high flow rate, strong dirt-holding capacity, and can filter fine particles.
And compared with other fiber materials and man-made materials, glass fiber material filter paper has higher filtration efficiency and stronger dirt-holding capacity.
Because most of the basic glass fiber filter paper does not use any additives, it is just curled glass microfibers, so it is very pure.
But because of this, should pre-wash to avoid not to remain in the filtrate in the microfibers, and should add a surface filter under the glass fiber.
3. According to usage
There are many types of surface filtration membranes, which are hydrophilic and hydrophobic (there are also some hydrophilic and hydrophobic dual-purpose membranes).
In short, hydrophilicity is more suitable for filtering aqueous solutions, but not for filtering organic solvents, acid-base solutions, and air; hydrophobicity is suitable for filtering organic solvents, acid-base solutions, and air.
But in fact, depending on the filter material, they have different characteristics.
4. Polypropylene vs. glass fiber membrane
If it is general ambient air sampling, not sampling under high-temperature conditions, should not recommend trying a glass fiber membrane.
High-throughput polypropylene fiber membrane, suitable for large-flow sampling
Good hydrophobic performance, not easy to absorb water vapor in the air, good constant weight performance after repeated heating, can save repeated heating process