Belzona 5821

A high performance epoxy-based coating for the protection of critical equipment operating under immersion and erosive conditions. 

Belzona 5821

A 2-part, epoxy-based, ceramic filled, solvent-free coating applied by brush or spray for the protection of metallic and non-metallic surfaces operating under immersion conditions in contact with aqueous solutions.

Belzona 5821 provides an outstanding protection from the effects of salt, water, acids, alkalis, alcohols and hydrocarbons. The coating can be applied to virtually any rigid surface including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass and aluminium.

Key benefits:

  • Effective protection of critical equipment operating under immersion conditions in contact with aqueous solutions
  • Reduced health and safety risks as it is solvent-free
  • Easy application by brush or spray
  • Application and cure at room temperature - no hot work involved
  • Excellent chemical resistance against a wide range of chemicals such as sea water, salt, alkalis, alcohols and crude oil
  • Eliminates the need for replacement and reduces downtime
  • Excellent adhesion to virtually any rigid surface including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass and aluminium

Applications for Belzona 5821 include:

  • Epoxy coating for tanks, bunds, pumps, submersible pumps, pipes, heat exchangers and clarifiers operating under immersion
  • Protection of tanks and secondary containment areas from chemical attack and erosion and corrosion damage
  • Protection of pipework from erosion, corrosion and chemical attack
  • High strength adhesive for metal bonding
Key technical data:
Working life at 20°C (68°F)  105 minutes
Time to immersion service at 20°C (68°F) 5 days
Pull off adhesion (D4541 / ISO 4624) 5,290 psi (36.5 MPa) on grit blasted steel
Coverage rate 2.5 sq.m  (27 sq.ft)  per ltr
Temperature resistance 50°C (122°F) immersed, 150°C (302°F) dry
Bonds to Most surfaces including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass and aluminium
Typical applications Protection  of equipment operating under immersion, metal bonding
Unit size 4 ltr and 15 ltr - 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 5821 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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