Sealing Materials for Air Filters

The main sealing materials for air filters include EPDM, EVA, and PU foam, and different materials are matched according to the service environment of the air filter.

I. EPDM (Ethylene Propylene Diene Monomer)

Core Advantages: Wide temperature resistance range (-50℃ ~ 150℃), excellent aging and ozone resistance, suitable for high-temperature or harsh environments.

Typical Applications: Automobile filter elements, construction machinery sealing, sound insulation strips for building doors and windows, especially for flame-retardant scenarios (e.g., ships, subways).

Notes: Before construction, test the curing time and material ratio to ensure sealing performance.

II. EVA (Ethylene Vinyl Acetate)

Core Advantages: Soft texture, strong self-adhesion, low cost, suitable for shock absorption and short-term sealing needs.

Typical Applications: Filter element edge wrapping, electronic accessory packaging (requiring antistatic properties), shock absorption pads for household equipment.

Limitations: Poor temperature resistance (usually ≤ 80℃), and may deform under long-term pressure.

III. PU Foam (Polyurethane Foam)

Core Advantages: High air permeability, fire and water resistance, suitable for sealing of purification equipment and primary filtration.

Typical Applications: Dust-proof filter elements for industrial air conditioners, sealing strips for air purifiers, and scenarios requiring buffering and thermal insulation.

Limitations: Weak pressure resistance, easy to adsorb impurities, requiring regular replacement.

IV. Other Sealing Methods

Gasket Seal with Liquid Groove: Suitable for high-cleanliness environments (e.g., laboratories, pharmaceutical factories). It achieves high-efficiency sealing through aluminum alloy grooves and sealing liquid (jelly glue), but the installation is complex.

Closed-cell Sponge Rubber: Commonly used in construction equipment, featuring good elasticity and strong adaptability, suitable for gap filling between filters and frames.

Summary

High-temperature/harsh environments: Prioritize EPDM for its weather resistance and flame retardancy.

Cost-sensitive scenarios: EVA or PU foam are more economical, but trade-offs need to be made regarding service life.

High-precision sealing: Liquid groove sealing or closed-cell sponge rubber can reduce leakage risks.