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Industrial Urea appearance granular or crystalline, no mechanical impurities, mass fraction of total nitrogen >46.3%, biuret <1.0%, moisture < 0.70%, particle size ( 0.85 - 2.80 mm ) >90% ( industrial urea according to the urea standard GB/T2440-2017) 3.2 Bulk industrial urea meets the following requirements : professional urea granule tank truck transportation, dedicated vehicles. 3.3. Bags of industrial urea meet the following requirements : 50 kg/bag, which can be stacked for five months without breaking the bag or peeling off the film.