The overall selectivity tow -aminoundecanoic acid is about 67%. Nylon 11 resulting from the polycondensation is mainly pro- duced in France by AT0 Plastiques (Rilsan@), in the USA, and in Brazil. A sufficient and inexpensive source of castor oil is necessary to produce it economically. This dependence on the main producing countries - North Africa, Brazil and India (the largest producer) - introduces uncertainties for future growth. World castor oil production figures are summarized in the adjacent table.