Methylene ureas were commercialized in the 1960s and 1970s, having 25% and 60% of the nitrogen as cold-water-insoluble, and unreacted urea nitrogen in the range of 15% to 30%.
As ureas de metileno comercialízanse nos anos 1960 e 1970, cun 25 e 60% de nit´roxeno total insolúbel en auga fría, e nitróxeno ureico que non reacciona no intervalo de 15 a 30%.