Belzona 5831 (ST-Barrier)

A moisture-tolerant epoxy coating for corrosion protection of wet and oil contaminated surfaces.

Belzona 5831 (ST-Barrier)

A 2-part epoxy coating which once cured forms a barrier coating for the protection of equipment operating under immersed conditions or in contact with aqueous solutions. This solvent-free epoxy coating bonds strongly to steel and other metallic and non-metallic surfaces such as concrete or brick.

Belzona 5831 (ST-Barrier) is specifically formulated for application to wet and oil contaminated surfaces that cannot be dry for application, as well as for underwater applications. The coating displaces water from the surface ensuring maximum adhesion to damp or wet surfaces, even underwater.

Key benefits:

  • Simple mixing ratio
  • Application and cure at room temperature - no hot work involved
  • Cures underwater
  • Reduced health and safety risks as it is solvent-free
  • Excellent bonding to wet surfaces
  • Tolerant to oil contamination
  • No shrinkage, expansion or distortion
  • Prevents galvanic corrosion 
  • Excellent bonding to many metal surfaces including steel, stainless steel and other specialist steels as well as to non-metallic surfaces such as concrete and brick

Applications for Belzona 5831 (ST-Barrier) include:

  • Prevention of corrosion and deterioration of metalic substrates in splash zones, pipework, tanks, bunds and clarifiers
  • Protecting submersible pumps, valves and transformers from the effects of galvanic corrosion
  • Long-term repair and coating of oil and water leaks
  • Sealing of joints and flanges
Key technical data:
Working life at 20°C (68°F) 45 minutes
Time to full mechanical loading at 20°C (68°F) 5 days
Coverage rate Practical coverage rate for a 2 coat system:
2.9 sq.m. (31.2 sq.ft.) per litre per coat
Tensile shear adhesion (ASTM D1002) 2,010 psi (13.86 MPa) on oil contaminated blasted steel
Salt spray resistance (ASTM B117) The coating shows no blistering or corrosion after 2000 hours exposure
Temperature resistance 40°C (104°F) immersed, 100°C (212°F) dry
Bonds to Steel, stainless steel, other metals, brick, concrete and non-metallic surfaces
Typical applications Corrosion protection of wet and oil contaminated surfaces operating under immersion
Unit size 4ltr, 16ltr. Pack sizes may vary locally
Availability* Global

* All products are subject to regional restrictions. Check with your local Distributor for more information

More information:

For more information about Belzona 5831 (ST-Barrier) please contact us or find your local distributor.

You can apply to join Belzona Connect to access additional information including SDS and instructions for use.


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