u-cat 3513n is an aliphatic dialkylurea used as a hardener for polyurethane foams. it is less active than u-cat 3512t, but has a longer shelf life. physicochemical properties of u-cat 3513n · cas no. : 135083-58-9 · molecular formula: c12h18n2o · molecular weight: 228.29 g/mol · appearance: white powder · density: 1.22 g/cm ³ · solubility: soluble in polar solvents such...