Hydrocharged Electret Technology in Air Filters: An Introduction

Core Technical Principles

Enhanced Electrostatic Adsorption

The hydrocharging process introduces stable electrostatic charges onto the surface of the filter's fibers. These charges create an electrostatic field. When fine airborne particles such as PM2.5, dust, and pollen pass through, the field attracts them to the fibers. Because capture does not depend solely on the physical size of the gaps between fibers, the filter's ability to remove fine particles increases substantially.

Charge Stability

Compared with conventional electrostatic treatments, hydrocharging gives the filter a more durable charge. The charge is less likely to decay rapidly because of changes in environmental humidity or temperature or after prolonged use, extending the filter's effective operating life.

Process Characteristics

Manufacturing Process

In simple terms, melt-spun fiber media are treated with water, such as high-pressure water jets or a fine water spray. This causes charges on the fiber surface to separate and become fixed, creating a stable electret structure.

Material Compatibility

The process is suitable for common filter materials such as polypropylene (PP). The treated fibers retain good air permeability, so filtration efficiency can be increased without a significant rise in airflow resistance.

Main Advantages

Efficient Filtration

Hydrocharged electret media can effectively capture fine particles 0.3 μm and larger. Their PM2.5 filtration efficiency can reach a high level, including N95-grade performance or above in appropriate product designs.

Low Resistance and Energy Savings

Compared with filters that rely solely on dense fibers for mechanical interception, hydrocharged electret filters have lower airflow resistance and reduce the energy consumed by ventilation equipment.

Long-Lasting Performance

Their stable electrostatic charge supports a longer service life, reducing replacement frequency and operating cost.

Applications

Hydrocharged electret media are widely used in household air purifiers, air-conditioning filters, automotive cabin-air filters, fresh-air ventilation systems, and other equipment requiring efficient air filtration. They are particularly well suited to environments where effective removal of fine particles is important.