Air Filters High and Low Temperature Resistance Performance of PU Frame and Engine Cabin Adaptability

The automobile engine cabin is a harsh working environment with extreme temperature differences. In summer, the cabin temperature can exceed 120 degrees Celsius after parking, while in cold winter, the ambient temperature can drop to minus 30 degrees Celsius or even lower. Ordinary rubber frames and inferior glue layers are prone to thermal expansion, softening, melting, low-temperature hardening, and brittle fracture under alternating hot and cold conditions, resulting in filter frame deformation and sealing failure.

High-quality automotive-grade PU glue is specially formulated with temperature-resistant molecular structure, possessing excellent wide-temperature environmental adaptability. After professional curing treatment, the PU frame can maintain stable physical properties in the temperature range of -30℃ to 120℃. It will not soften and deform under high-temperature baking, nor harden and crack under severe cold freezing. The unique elastic memory structure allows the PU frame to automatically adjust the fitting tightness according to temperature changes, always maintaining zero-gap sealing with the air intake housing.

In addition to temperature resistance, qualified PU glue also has outstanding anti-aging and anti-oxidation capabilities. It can resist long-term engine vibration, wind pressure impact, and environmental humidity erosion, without degumming, powder falling, or yellowing aging during the entire service cycle. This stable environmental adaptability ensures that the air filter maintains 100% sealing efficiency from installation to replacement, protecting the engine from dirty air intrusion in all weather conditions.