How are urea products classified? What are their respective features?

OP, what exactly do you mean by “urea product classification”? Urea products are classified according to **standards** into premium grade, first-grade, qualified, and unqualified products; there are no other classification methods beyond these. Of course, depending on the granulation process, they are also divided into large particles and regular particles.

Urea is classified according to **standard criteria**, such as its color, moisture content, biuret content, and particle size; based on these factors, it is divided into premium grades, first-grade products, qualified products, and unqualified products. Nowadays, in response to market demands and advancements in production technology, peptide urea has been developed. This post was last edited by lxq700918 on 2009-2-2 21:55.]

Urea is a highly efficient and excellent type of nitrogen fertilizer; with a nitrogen content of over 46%, it reduces transportation and usage costs. It does not damage the soil after use, and it is one of the nitrogen fertilizers widely used by farmers. The urea produced by our company is manufactured and tested in accordance with the international standard GB2440–2001. The entire urea production process is controlled and regulated automatically by microcomputers, which optimizes the operational conditions and ensures product quality. The company introduced in 1999 the large-granule urea production technology and core equipment from Norwegian Hydrus; the large-granule urea produced using this technology features a high nitrogen content, low levels of biuret and moisture, high strength, no powder formation, no caking, good storage stability, high efficacy, long-lasting effectiveness, and ease of use. Furthermore, large-grained urea is also an excellent raw material for producing NPK-type blended fertilizers. Chemical name: Carbodiimide Molecular formula: CO(NH2)2 Physical and chemical properties: I. Appearance: White or light-colored particles. II. Properties: Soluble in water, hygroscopic. III. Main uses: It is used as a fertilizer in agriculture, and as a raw material for industries such as plastics, resins, and coatings. IV. Specifications: Urea with particle size d0.85–2.80 mm (small particle urea); urea with particle size d1.18–3.35 mm (medium particle urea); urea with particle size d2.00–4.75 mm (large particle urea). V. Quality standards: Urea shall comply with the standard of the People’s Republic of China, “Urea” (GB 2440–2001). Production and testing of agricultural-grade urea in small and medium particle sizes ； Large-grain urea is produced and tested in accordance with the standards for high-quality agricultural products. Packaging specifications: Urea (kg/bag). Note: For quantity of 40, packaging is done in bags with plastic lining on the inside and woven fabric on the outside, or in bags with an inner membrane; for quantities of 50–1000, it is packaged in bulk. Parameter names: Industrial use, Agricultural use, Premium grade, First-class grade, Conforming grade, Premium grade, First-class grade, Conforming grade. Total nitrogen (N) content (on a dry basis), %: ≤46.5, 46.3, 46.3, 46.4, 46.2, 46.0. Dicyandiamide content, %: ≤0.5, 0.9, 1.0, 0.9, 1.0, 1.5. Water (H2O) content, %: ≤0.3, 0.5, 0.7, 0.4, 0.5, 1.0. Iron content (as Fe), %: ≤0.0005, 0.0005, 0.0010. Alkalinity (as NH3), %: ≤0.01, 0.02, 0.03. Sulfate content (as SO42-), %: ≤0.005, 0.01, 0.02. Water-insoluble matter content, %: ≤0.005, 0.01, 0.04. Methylene dicyandiamide content (as HCHO), %: ≤0.6, 0.6, 0.6. Particle size: 0.85–2.80 mm, %: ≥90, 90, 90, 93, 90, 90; 1.18–3.35 mm, %: ≥2.0; 4.75 mm, %: ≥4.00; 8.00 mm, % ≥