Case Study

External Corrosion Protection of Hoppers and Day Bins


External innovators of pneumatic conveying systems & bulk solid handling solutions, UK.

Application date

January 2022.

Scope of work

Client requested the external corrosion protection of 2x sand hoppers, 2x weigh hoppers and 4x off day bins, which would be subject to a coastal service environment.


Plasmet ZF.

Corrothane AP1.

Coating system

  • Masked up and protected machined surfaces prior to abrasive blasting and coating.
  • Abrasive blasted surfaces with new abrasive in accordance with ISO 8501-1 to Sa2 surface finish, to achieve a minimum surface profile of 50 microns.
  • Applied 1st and 2nd coat of Plasmet ZF to achieve a minimum DFT of between 100-150 microns per coat.
  • Applied topcoat of Corrothane AP1 to external surfaces.
  • Carried out 100% visual inspection.
  • Packed and prepared for dispatch.
  • On completion of the application, the coating was post cured at 60-80°C for 8 hours to ensure the full cure offered resistance required against the waste streams being collected.

Coating credentials

Plasmet ZF: A two-pack epoxy coating compound incorporating glass flake, which has passed the NORSOK  standard 501 testing.

An epoxy compound incorporating rust converter, inhibitor and passivator, with leafing barrier protection, Plasmet ZF  is used as a surface tolerant coating, formulated to give good protection on rusted surfaces and also as a high quality primer on blast cleaned substrates.


Corrothane AP1: A two pack, solvent borne, isocyanate -free polyurethane acrylic top coat. It is a high performance cosmetic top coat used primarily over the top of Corrocoat coatings to give good protection on rusted surfaces and also a high quality primer on blast cleaned steel substrates.

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