Our polyurethane coating agent for slow-release fertilizer is designed for fertilizer-coating development and manufacturing programs involving urea, compound fertilizer, high-tower compound fertilizer, coated compound fertilizer and selected organic-fertilizer granules. The material is supplied as a yellow liquid and is intended for controlled application by suitable coating equipment. According to the product technical documentation, its reported quality-control indicators include an acid value of 0.51 mgKOH/g, viscosity of 683 mPa.s at 25°C, hydroxyl value of 249 mgKOH/g and moisture content of 0.3%. Users should confirm the latest technical data sheet and certificate of analysis before production use.
A coated fertilizer’s release behavior depends on more than the coating agent alone. Granule size, fertilizer composition, coating weight, film continuity, curing conditions, application equipment and test temperature can all influence measured nutrient release. This is why a practical development program should evaluate the complete coated granule, rather than relying only on raw-material data or a nominal coating ratio.
Illustrative manufacturing scenario: A fertilizer producer is developing a coated urea grade for a defined crop cycle. The production team first agrees a target release window and selects representative urea granules. It then runs a controlled screening matrix that varies coating weight, spray conditions and curing parameters. Samples are conditioned and tested under the company’s chosen nutrient-release method. The team uses the results to identify a workable process range before confirming the final commercial specification. This is an illustrative development scenario, not a guarantee of release duration or field performance.
The coating agent can also support process planning in conventional coating equipment, such as rotary drums or fluidized-bed systems, provided that the equipment, safety procedures and process conditions are appropriate for the formulation. Manufacturers should establish their own operating parameters for storage, mixing, application, curing and quality inspection. Production-scale confirmation is particularly important when changing fertilizer type, granule size, coating thickness or destination-market requirements.
Controlled-release claims should be supported by a stated test method, temperature and release period. Environmental, regulatory, transport and crop-performance claims must likewise be verified for the finished fertilizer in the intended market. Sound documentation helps export-focused producers align product specifications, batch records and customer communication with the actual coated product.
FAQ: What fertilizer types can be evaluated with this coating agent? It may be evaluated for urea, compound fertilizers and other compatible fertilizer granules, subject to product-specific processing trials.
FAQ: Does a coating agent itself guarantee a 60-, 90- or 120-day release period? No. Release duration must be verified on the finished coated fertilizer under a defined method and temperature.
FAQ: Which data should be reviewed before a production trial? Review the current technical data sheet, certificate of analysis, safety information, fertilizer-granule specification and the proposed coating and curing process.