Pentamethyldiethylenetriamine is a colorless to light yellow clear liquid, easily soluble in water. It is a highly active catalyst for polyurethane reactions, mainly catalyzing foaming reactions, and is also used to balance overall foaming and gel reactions. It is widely used in various polyurethane rigid foams, including polyisocyanurate sheet rigid foams. The production methods of pentamethyldiethylenetriamine include formaldehyde formic acid method and formaldehyde hydrogenation method.