Quality Standards of Urea Prill - Criteria & specifications

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what are the quality standards of urea prill? What are urea prill grading criteria? These are the questions related to prill urea, which knowing them, will help users like, farmers and industry owners choose this product effectively. In this article quality standards of urea prill and its requirements are explained.

What is prill urea?

Urea (CO(NH₂)₂) is one of the most widely used sources of nitrogen, containing approximately 46% nitrogen by weight. It serves as a key component in fertilizers due to its high nitrogen content and cost-effectiveness.

A specialized product derived from urea is prill urea, which is manufactured using advanced methods to achieve specific quality standards. Based on the quality standards of urea prill, Prill urea appears as small, round, white spheres, typically 1–2 mm in diameter, formed from molten urea.

The production of prill urea involves a two-step process. First, droplets of liquid urea are created through a controlled mechanism. Next, these droplets are solidified into dry spheres by passing them through a stream of air that cools them effectively. This manufacturing method ensures uniformity in size and shape, making prill urea an ideal choice for agricultural and industrial applications.

What’s prill urea used for?

Being soluble and a high-quality source of nitrogen makes prill urea a perfect product to use as agricultural fertilizer as well as industrial application.

With more than 90% of the world’s production, prill urea is used mostly as a nitrogen fertilizer in agricultural fields. The quality standards of urea prill show that this product can dissolve quickly in water and release a great amount of nitrogen.

This substance can be mixed with other fertilizers like, Potassium chloride to slow down the breakdown process to stop it from evaporation during rain. According to IFA (the International Fertilizer Association), prill urea has 56% of the market in the world which makes it a popular nitrogen fertilizer.

Prill urea application – 6 Applying fields

Besides agriculture, prill urea is used as a raw material in manufacturing chemical compounds, like:

plastics (urea-formaldehyde resins)
adhesives (urea-melamine-formaldehyde)
industrial feedstock (Potassium cyanate)
manufacture of Melamine
Use in pharmacology
in diesel engines
snow melting

Urea prill specifications

Based on the quality standards of urea prill, the nitrogen content in different forms of urea fertilizer—prill and granular—is the same, with both containing approximately 46% nitrogen. However, there are notable differences in their physical properties and performance.

Prill urea is smaller in size, typically 1–2 mm in diameter, and softer compared to granular urea. These characteristics allow prill urea to release nitrogen more slowly, making it suitable for controlled nitrogen delivery. Additionally, prill urea is absorbed more quickly in soil due to its fine structure, making it particularly effective in applications requiring rapid nitrogen availability to plants.

These differences make prill urea a preferred choice in specific agricultural settings, depending on the crop requirements and soil conditions. Here we have urea prill specifications in detail:

Nitrogen Content: 46.2%
Biuret: Maximum 1.0%
Moisture: Maximum 0.5%
Granulometry (Granule Size): 90% minimum between 1mm to 4mm
Free Ammonia: Maximum 160 PXT PPM
Melting Point: 32°C
Physical Properties: Non-radioactive, white, free-flowing, free from harmful substances, and 100% treated against caking

Urea vs Other Nitrogen Fertilizers- Which is Best for Your Farm?

Quality control for urea prill

the quality standards of urea prill show that standards for urea prill quality are related to some parameters. You can follow ISO 18643:2016 and ensure proper sampling, storage, and equipment calibration which is explained briefly below.

The quality standards of urea prill are based on these key parameters.

Nitrogen Content: ~46% (tested by titration).
Moisture: <0.5% (tested via drying or moisture analyzers).
Biuret: <1% (tested by spectrophotometry).
Granule Size: 2–4 mm (tested by sieving).
Crush Strength: Assessed with force gauges.
Free Ammonia: Minimal (tested via gas chromatography).
Appearance: Uniform, white, and impurity-free (visual check).

Urea prill certification requirements and control involve using random sampling to ensure accurate representation. Urea should be stored in a cool, dry, well-ventilated area to prevent moisture absorption. Testing instruments must be regularly calibrated to maintain accuracy. Compliance with ISO 18643:2016 and local regulations is essential.

Where to purchase high-quality urea prill?

As a farmer or an industry owner, getting your hand on a cost-effective, pure, high-quality product is a challenge in this field. The good thing is that there are some companies which produce and distribute this product.

Petro Arkan, a well-known company, has made this easier. Producing and delivering a high-quality urea product makes this company one of the most reliable sources. Producing the purest and most affordable urea products is Petro Arkan’s specialty.

Summary

Urea prill and its fields of use are increasingly popular among different industries. Being highly rich in nitrogen makes it a perfect source of nitrogen which is released effectively and efficiently. However, based on the quality standards of urea prill, certain specifications and quality control requirements are needed to have a pure and valuable product.

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