Anti-Powdering and Anti-Peeling PU Formula for Long-Life Filter Frame Stability

Powdering, cracking, and surface peeling are common quality failures of inferior PU filter frames. Many cheap filters use impure PU raw materials and incomplete curing processes. After a period of use, the frame surface turns powdery, falls off debris, and even peels from the filter paper edge. The fallen tiny foam particles may be inhaled into the engine intake pipeline, causing throttle blockage and cylinder abrasion.

Professional filter-grade PU foam adopts an improved anti-powdering formula with high-purity polyether components and balanced curing agent ratio. The precise chemical reaction ensures complete molecular cross-linking without residual unstable monomers. After multi-stage constant-temperature curing, the frame surface forms a dense and tough protective layer, achieving excellent scratch resistance, friction resistance, and anti-aging performance.

This advanced formula effectively prevents surface pulverization under long-term vibration, wind erosion, and temperature alternation. The frame will not turn white, crack, or peel even after months of high-intensity operation. The tight bonding layer between PU foam and filter paper remains solid permanently, avoiding edge separation. Anti-powdering PU technology is a basic but crucial standard for export-grade air filters, ensuring clean intake air and safe engine operation without secondary pollution.