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...