Supplier From
Muscat,
Oman
Supplier From
Muscat,
Oman
Detailed specifications for urea vary depending on whether it is in prilled or granular form, and whether it is for agricultural, technical, or analytical use. Key parameters generally include its nitrogen content, moisture, biuret levels, and particle size.
Common specifications for fertilizer-grade urea
Urea is a high-nitrogen fertilizer, typically supplied as white, free-flowing prills or granules. Common agricultural specifications include:
*Nitrogen content: A minimum of 46.0% is standard. This is the primary indicator of its fertilizing value.
*Moisture: A low moisture content is critical for preventing the product from caking and clumping. The maximum moisture is typically 0.5% for granular urea and can be lower for prilled urea.
*Biuret content: This is a byproduct of urea manufacturing and is harmful to plants at high concentrations. The maximum biuret content is typically kept below 1.0%.
*Particle size (granulometry): This affects how the fertilizer is handled, stored, and applied.
*-Prilled urea typically has a size range of 1 to 4 mm, with at least 90% of the material falling within this range.
*-Granular urea has a slightly larger range, often 2 to 4 mm, with similar percentage requirements.
*Physical state: White granules or prills, free-flowing, and free from harmful substances.
*Color: Standard or pure white.
*Melting point: The melting point is approximately 132C.
*Free ammonia: The maximum content is often specified at 160 ppm.
Specifications for technical-grade urea
Urea is also used for industrial applications, such as in the production of specialty pollution control solutions. While some specifications overlap with fertilizer grade, technical-grade urea may have stricter purity requirements depending on its use. For example, standards from organizations like the Bureau of Indian Standards (IS 1781) and ISO 18642 define specific requirements for technical and fertilizer grades, respectively.Â
Analytical-grade ureaÃ? For laboratory use, urea must meet very high purity standards defined by pharmacopeia and chemical suppliers. For example, the Sigma-Aldrich analytical standard for urea specifies:Â
Assay: (=> 98.5%) (or even higher, like 99.0-100.5% for Ph. Eur., BP, USP).
Impurities: Very low levels of water and other impurities.
Melting point: A specific, narrow range, such as 132-135C.
Key differences between prilled and granular ureaÂ
While both are common forms of fertilizer, their physical properties differ:
*Prills: Smaller, rounder particles with a diameter around 2 mm.
*Granules: Larger particles, typically 3-4 mm, which are harder and more resistant to crushing. Granular urea may be preferred for bulk blending and mechanical application due to its size and strength.
