Common Materials and Working Principles of High-Efficiency Air Filters

2025-08-14 20:53:49

Click：

“ High-efficiency air filters remove particles of 0.3 μm and larger. Learn about common media, frames, seals, and the main filtration mechanisms. ”

The core function of a high-efficiency air filter is to remove particles measuring 0.3 μm and larger from the air. These filters are widely used in cleanrooms, healthcare facilities, and other environments with stringent air-quality requirements.

Common Materials

Filter Media

Glass fiber is the most commonly used filter medium. Its very fine, micron-scale fibers interweave to form a dense network of pores that can capture airborne particles with high efficiency. Some premium products use PTFE (polytetrafluoroethylene) membranes, which offer superior temperature resistance and chemical stability.

Frames

Frames are generally made of aluminum alloy or galvanized steel. These materials provide a strong, dimensionally stable structure that resists deformation and suits a range of installation environments.

Sealing Materials

Polyurethane foam or nitrile rubber is commonly used to create a tight seal between the filter and the equipment. This prevents unfiltered air from bypassing the filter.

Working Principles

High-efficiency filters rely on several filtration mechanisms working together:

• Interception: When a particle is larger than the gaps in the filter medium, it is directly blocked by the fibers.

• Inertial impaction: Larger particles have enough inertia that they cannot follow the airflow as it bends around the fibers. They collide with the fibers and are captured.

• Diffusion: Very small particles, including submicron particles, move randomly because of Brownian motion. This increases the likelihood that they will collide with and be captured by a fiber.

• Electrostatic attraction: Some filter media are electrostatically charged so that electrical forces attract charged particles, further improving filtration efficiency.

Through precise material design and the combined effect of these mechanisms, a high-efficiency filter can achieve filtration efficiency of 99.97% or more for 0.3 μm particles.

0

Long by picture save/share

Prev : How to Choose a Pre-Filter for a Home Air Purifier

Next : Understanding Filter Media in Fresh-Air Air Conditioners

Common Materials and Working Principles of High-Efficiency Air Filters

分享至微信分享

分享至微信