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Ultraviolet irradiation (above 285 nm) of ethylenethiourea (ETU) on a solid substrate such as silica gel affords 2-imidazolidone as the major identifiable product. Several other products are formed, of which only bis(imidazolin-2-yl) sulfide has been identified. The 2-imidazolidone does not appear to undergo further degradation under these conditions. Decomposition of ETU is rapid, particularly in the presence of photosensitizers. Aqueous solutions of ETU undergo a very slow photolysis, which is markedly accelerated by sensitizers. ETU is stable to hydrolysis over the pH range 5.0 to 9.0 at 90°.