Recent torrential rains in southern China have exacerbated water leakage in aging residential complexes. A domestic tech firm has launched an innovative polysilazane-based waterproof coating, successfully deployed in the renovation of historic buildings in Hangzhou. Lab tests show that a 0.3mm-thick layer withstands 10 hours of heavy rain, with UV resistance 5 times superior to conventional asphalt materials.

Experts explain that the dense Si-N bond network in polysilazane molecules effectively blocks water penetration. Combined with silicone resin modification technology, the coating offers exceptional flexibility and adhesion, making it ideal for preserving ancient brick-wood structures. China's Ministry of Housing has included this technology in its Urban Renewal Technical Guidelines, with plans to implement it in 30 pilot cities this year. Industry analysts predict the silicone-based waterproofing market will surpass RMB 800 million in 2023.