Coatings for Granular Urea
OptiU® for granular urea
Solid urea is the most widely used nitrogen source in agriculture. Its affinity to absorb moisture frequently leads to lump formation during storage, and its high solubility reduces the critical relative humidity (CRH) of any bulk blend it enters, making handling, storage, and blending with other fertiliser grades difficult and costly.
Crommelin AgriCoatings OptiU® is a non-toxic, non-hazardous, biodegradable liquid coating that forms a barrier film on the urea surface, significantly reducing its tendency to cake and improving its compatibility in bulk blends.
What OptiU® Does
Prevents lump formation as coated urea remains free-flowing in humid bulk storage and when bagged under pressure
Improves bulk-blend compatibility, enabling urea-phosphate blending without lowering the blend’s critical relative humidity
Acts as a carrier for additional compounds, including humates, nano particles of sulphur, zinc oxide, and copper oxide
Sets within 60–90 seconds with no drying, curing, or additional process steps required
The barrier film does not wear off or become less active over time
Application
OptiU® is applied in any standard fertiliser blending or mixing facility by spraying or dribbling the coating onto urea in a mixer or blender. No capital outlay for specialised equipment is required. The coating is not sticky, does not cause build-up on equipment, and can be applied in humid conditions. Coated urea can be dispatched, bagged, or blended directly after the single-step coating process.
Technology
Most existing urea coatings are focused on nitrogen release rate, moisture uptake management, sulphur addition, or humate inclusion. None of these addresses the core handling and blending limitations of solid urea.
OptiU® is specifically formulated as a barrier coating to lower urea’s affinity to form lumps and to raise its CRH tolerance in blends, a technically distinct objective from all other current coating approaches for this substrate. It is the first commercially available coating in the world to achieve this in a simple, single-step ambient-temperature process.
Free-flowing urea. Blend-ready.
Ask our team how OptiU keeps granular urea free-flowing and compatible in bulk blends, from storage through to spreading.