Filtration Efficiency: What Is It and Why It’s Important

Articles | Filter | Life Sciences | Membranes | Porous Fiber | Sintered Porous Plastic |

Filtration efficiency is a critical factor in many industries and plays a vital role in ensuring the filters work efficiently. In this article, we will explore what filtration efficiency is, its importance, and how Porex can help you overcome filtration design challenges with customizable solutions.

What is Filtration Efficiency?

Filtration efficiency assesses a filter’s ability to remove particles from a liquid or gas. This is measured by comparing particle concentrations before and after filtration, typically done with particle counters. These devices analyze particle size and quantity upstream and downstream of the filter. Filtration efficiency is determined by the ratio of particles upstream to those downstream at the rated size. The Beta Ratio directly calculates filter efficiency, and the percentage efficiency is obtained using the formula (% efficiency = (beta-1)/beta x 100).

Factors for Filtration Efficiency

Filtration is influenced by two important properties: pore size and pore volume. The key factor for filtration efficiency is pore size, which is the size of the pores that sets the maximum limit for particle passage through a filter. Smaller pore sizes are used to restrict the transit of larger particles.

Another factor for filtration is pore volume. Pore volume is the percentage of air in the sintered plastic part compared to the total volume of the part. This directly correlates to a device’s absorption volume and flow resistance capabilities. Sintered particle plastics can create large or small voids that provide the appropriate amount of particle retention needed for the device to perform as intended.

Porex sets itself apart by providing filtration solutions that are customized to meet specific needs. With the ability to tailor both pore size and volume, Porex ensures that filtration media is perfectly aligned with the requirements of various applications. This personalized approach enables the development of filters that not only satisfy industry standards but also optimize filtration efficiency to suit the distinct needs of each device or system.

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Bacterial and Viral Filtration Efficiency

Efficient filtration of bacteria and viruses is crucial when retaining microscopic particles is of utmost importance, especially in the life sciences. Whether it’s pipette tip filters or medical devices, bacterial and viral filtration is critical for maintaining the integrity of processes and ensuring the safety of end-users.

Leveraging extensive experience, Porex is a trusted partner for medical device manufacturers in the life sciences sector. Our specialized filtration solutions surpass industry standards, ensuring the highest performance and reliability. With a commitment to innovation and precision, Porex contributes to developing cutting-edge products that prioritize efficacy and safety in critical healthcare applications.


Filtration efficiency is a critical factor in many applications. If your product involves filtration, Porex can provide a customizable solution for you. Connect with our team of experts or browse our selection of samples.