Penmethyldiethylenetriamine PC-5: “Black Technology” in the field of waterproof materials In the field of modern architecture and engineering, waterproofing technology has always been a key link in ensuring long-term stability and durability of buildings. In recent years, a chemical substance called pentamethyldiethylenetriamine PC-5 (hereinafter referred to as PC-5) has launched a technological revolution in the...