n-Butyraldehyde: Colorless transparent liquid with suffocating odor, commonly used as an intermediate for resins, plastic plasticizers, vulcanization accelerators, pesticides, etc. Butyraldehyde (C4H8O) is found in many essential oils such as flowers, leaves, fruits, grasses, dairy products, and alcohol in nature. Extreme dilution has an ethereal fragrance. Used as an intermediate for resins, plastic plasticizers, vulcanization accelerators, pesticides, etc.