PTFE or Polytetrafluoroethylene membrane filters are resistant to many solvents used in the laboratory filtration procedures. They are versatile and thus, preferred for a variety of applications including filtration of organic as well as aqueous solvents. Also, they can be used for filtration of aggressive solutions. When filtering the aqueous substances, the filters should be pre-wetted with a water-miscible solvent for easy clarification. Due to their versatility, they are also used for food analysis, environmental sampling, content uniformity, and QC analysis. There are many benefits of buying PTFE syringe filter. You should consider the quality, pore size, and diameter of the filter membrane for making the right selection.

They Are Available With Hydrophobic And Hydrophilic Membranes:

PTFE filters are available as both hydrophobic and hydrophilic membranes. A hydrophilic membrane can easily be wetted with water and virtually any liquid. As per their compatibility, they can be preferred for filtration of aqueous solutions. When they are wetted, they do not allow passage of gases unless the liquid is extracted from the pores. On the other hand, hydrophobic membranes do not wet in water. However, they can be pre-wetted for purification of non-polar solvents. They are best suited for low surface tension solvents, gas filtration, and venting applications. You should make a selection according to the compatibility of the solutions and other requirements of applications.

What Are The Specifications Of PTFE Filters?

With their unique specifications, these filters can be used for a wide variety of filtration methods. They are available in color-coded polypropylene PP housing. You can buy PTFE syringe filter in sterile or non-sterile form. They have a female Leur lock for the inlet along with a male slip Leur for the outlet of samples. The diameter and the pore size vary according to specific needs of an application. They must be selected as per the volume of sample intended to pass through the filter membrane. Apart from these, they are available with better hold-up volume as well as appropriate temperature and pressure ratings.

How To Select The PTFE Filters?

For selecting these filters, you should check their flow rate and efficiency. They should be capable of providing smooth flow rate for different types of solutions. For finest filtration and particulate-free sample, you should prefer superior quality PTFE filter. This will enhance the life of apparatus and reduce the cost of analysis over the period. For a smooth distribution of flow rate over the life cycle of filtration process, you should check the distribution rings in the filter.

Also, analyze the risk factors like sample contamination caused due to rupturing of the membrane or its cleanliness. Sample binding and backpressure are other important risk factors to be determined while using the filters. Prefer buying from a manufacturer holding international certifications for ensuring accuracy in applications of syringe filters.