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Belzona® Saves The Bull Gear



Mining and Quarrying (MINQ)



Mechanical Power Transmission (MPT)


Customer Location:

N.E. Washington, USA


Application Date:

November 2014


Application Situation:

Ore processing Ball Mill bull gear.



The gears on this Ball Mill bull gear were experiencing erosion and pitting.



Belzona 1111 (Super Metal)

Belzona 1321 (Ceramic S-Metal)





Application Method:

The application area was thoroughly cleaned with solvent and then grit blasted to prepare the surface. All erosion damage was filled in with Belzona 1111 and followed with a brush on coating of Belzona 1321 to protect against further damage.


Belzona Facts:

If unchecked, the erosion damage could have weakened the bull gear, forcing the need to replace it. There are a total of 5 of these gears with damage and they were manufactured in the 1960's. The replacement cost is estimated at $150,000.00 USD each and roughly 3 months to have them made. This Belzona repair was handled in a couple days by one person and used less than $150.00 USD in material.


Photographs Description

  1. 1 of 5 Ball Mills.
  2. Erosion damage cleaned and grit blasted.
  3. Application of Belzona 1111.
  4. Application of Belzona 1321.
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