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UREA PRILLED AND GRANULAR AVAILABLE FOR SALE AND SUPPLY TO SERIOUS BUYERS WORLDWIDE.
Solid urea is marketed as prills or granules. The advantage of prills is that, in general, they can be produced more cheaply than granules, which, because of their narrower particle size distribution, have an advantage over prills if applied mechanically to the soil. Properties such as impact strength, crushing strength, and free-flowing behaviour are, in particular, important in product handling, storage, and bulk transportation.
Urea has the ability to form "loose compounds", called clathrates, with many organic compounds. The organic compounds are held in channels formed by interpenetrating helices comprising of hydrogen-bonded urea molecules. This behaviour can be used to separate mixtures, and has been used in the production of aviation fuel and lubricating oils. As the helices are interconnected, all helices in a crystal must have the same "handedness". This is determined when the crystal is nucleated and can thus be forced by seeding. This property has been used to separate racemic mixtures.