Nonwovens: Characterising Pore Size for Filtration Performance

The Role of Nonwovens in Filtration

Nonwoven materials play an essential role in filtration across a wide range of industries. Manufacturers use these versatile materials in air-conditioning systems, face masks, water purification, blood filtration and pharmaceutical processing. Each application demands specific filtration properties to achieve reliable performance, maintain product quality and meet relevant industry requirements.

Why Pore Size Matters

Manufacturers can produce nonwovens using different processes, including spunbond and meltblown techniques. These methods, alongside factors such as material composition and weight, influence the material’s strength, durability and filtration characteristics.

However, pore size also plays a crucial role in determining how effectively a nonwoven captures particles while allowing fluids or gases to pass through. Manufacturers must understand the pore structure to select suitable materials for their intended applications. Pore size distribution can also affect permeability, flow rates and filtration efficiency, making accurate characterisation an important part of product development and quality control.

Measuring Pore Size with Capillary Flow Porometry

Capillary flow porometry provides a straightforward and reliable method for characterising the pore structure of nonwoven filter media. The technique measures pore sizes by comparing gas flow through a dry sample with flow through the same sample after a wetting liquid fills its pores.

This approach helps manufacturers assess key pore characteristics, including the largest pores, mean flow pore size and pore size distribution. These measurements support material selection, product development and routine quality assurance, helping manufacturers maintain consistent performance between production batches.

Reliable Results with POROLUX™ Porometers

Our POROLUX™ porometers deliver fast, reproducible measurements that help manufacturers make informed decisions about their filtration materials. The POROLUX™ Cito L has established a strong reputation within the nonwoven media industry, providing a practical solution for pore size characterisation.

By understanding the pore structure of nonwoven materials, manufacturers can optimise filtration performance, compare materials and support consistent product quality across a wide range of applications.