Water Resistance and Anti-Breakage Performance of PU Foam Auto Filter in Rainy and Wet Road Conditions

Vehicles often drive on rainy roads, wet muddy roads, and foggy humid environments. Splashing water vapor, humid air, and dew will continuously invade the engine air intake compartment. Ordinary filter frames made of poor-quality glue or recycled rubber easily absorb water, swell, soften, and break after contacting moisture, resulting in edge breakage, air leakage, and early filter scrapping.

Automotive-grade closed-cell PU foam has natural waterproof and moisture-proof performance. The independent closed bubble structure inside the frame completely isolates water molecule penetration. The surface density is high and smooth, making it impossible for moisture to infiltrate the bonding interface between frame and filter paper. Even if the filter is exposed to humid air for a long time or encounters sudden rain splashing, the internal filter media remains dry and intact.

In addition, the wet tensile strength of PU foam is far higher than that of ordinary adhesive materials. It will not soften, expand, or break after absorbing trace moisture. This excellent water resistance ensures that the air filter maintains stable structural integrity and sealing performance in all weather conditions, effectively adapting to rainy seasons, coastal humid climates, and muddy road working environments, greatly improving product environmental adaptability.