Renewable, water-based liquid emulsion containing the active urease inhibitor, NBPT for coating urea

Newly developed technology in Glaze Extend provides protection to the active urease inhibitor ingredient NBPT. This allows coated urea granules to be blended with acidic or phosphate based fertilisers and still reduce ammonia volatilisation after being blended for extended periods of time

Apply less. Lose less

Research shows the risk of N-loss from urea application in spring to autumn averages 18%, unless 10mm of water falls within 8 hours.

Glaze Extend reduces N-loss by 75% within the first 48hours after application and up to 50% of the total loss within the first 7 days*

Key Product Features


  • Solvent Free
  • Water-based Emulsion
  • PH Neutral
  • Emulsion is Biodegradable
  • Free of dangerous NMP


  • Enables coated urea to be used in blends and remain effective as a urease inhibitor product.
  • Ammonia volatilisation trials have been completed with AS, DAP, MOP, MAP and SSP


Handling Benefits

  • No Harsh Chemicals
  • Less PPE required by operator
  • Less maintenance required on coating and blending equipment
  • Doesn’t flash-off any toxic gasses
  • No odour


Quick Drying

  • Fast spreading – enables quick and even coating on urea
  • Quick drying with low curing time – Can be dispatched as coated urea immediately after manufacture
  • Can be used in all fertiliser blending equipment

Logistical Benefits

  • Product comes in ready-to-use liquid
  • Manufactured product to be stored for extended periods of time
  • Tests have shown Glaze Extend is still active on urea, 180 days after coating

Glaze Extend is available in two different formulations

Primary use is for coating Urea which will be mixed into a fertiliser blend.

It is specially formulated to reduce the ammonia volatilisation of coated urea in blends for up to 90 days

Primary use is for application into UAN or coating urea which will be applied straight, not in a fertiliser blend.

Lower-cost formulation

Independent Scientific Trials

Professors, Hong J Di and Keith Cameron and Dr Andriy Podolyan, Centre for Soil and Environmental Research,

Lincoln University

Ammonia Volatilisation Field Trial from NBPT products and ammonium sulphate mixes –  May 2021

Conclusions after 7 days:

    • Glaze Extend product reduced ammonia volatilisation by 50% (comparison Glaze Extend vs standard urea)
    • Glaze Extend in a 50:50 mix with GAS resulted in a reduction of ammonia volatilisation of 71% after 72 hours of mixing
    • Glaze Extend in a 50:50 mix with GAS resulted in a reduction of ammonia volatilisation of 61% after 21 days of mixing

90-Day Blend trial

Lincoln University

Ammonia Volatilisation Trial from Mixed Glaze Extend NBPT Products –  May 2023

  • Glaze Extend coated urea was stored as mixes for a 90-day period with the following before conducting the field trial:
    • Monoammonium Phosphate (MAP),
    • Diammonium Phosphate (DAP),
    • Granular Ammonium Sulphate (GAS);
    • and Muriate of Potash (MOP)
  • Conclusions

Despite being mixed in an acidic fertiliser blend for 90 days, Glaze Extend continued to be an effective urease inhibitor, reducing the ammonia volatilisation of coated urea.

  • Glaze Extend in a 50:50 blend of MAP, DAP, GAS or MOP resulted in a reduction of ammonia volatilisation of 48-60% after 90 days of mixing

Contact us for a copy of the full Lincoln University Trial Reports!

*March 2021 Lincoln University Ammonia Volatilisation field trial results

Total NH3-N Losses at 7 days

Contact us to receive a FREE sample pack!

We would love to hear from you and explore which Glaze products can benefit your business.

Phone: +64 21 043 7258

49 Hynds Drive, Rolleston 7675
New Zealand

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