BELZONA 5851 (HA-Barrier)

A heat-activated epoxy coating for in-situ application to hot metal surfaces with minimal preparation to protect against corrosion

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A solvent-free, single-component epoxy coating, which cures in contact with hot surfaces and is designed to prevent or protect metal from corrosion under insulation (CUI). Belzona 5851 (HA-Barrier) can be easily applied by brush and does not require any weighing or mixing.

This heat-activated material can be applied directly onto hot surfaces (70-150°C / 158-302°F) with minimal surface preparation, avoiding production downtime. Once cured, it provides outstanding corrosion protection. Also available is Belzona 1251 (HA-Barrier), a heat-activated epoxy repair composite which can be used in fill pitting and bond equipment among other applications.

Key benefits:

  • In-situ application to live equipment operating at high temperature with minimal surface preparation
  • Single pack system, no weighing or mixing required
  • Reduced health and safety risks as it is solvent-free and no hot work is required
  • Fast cure  allowing equipment to be re-insulated with minimum delay
  • Excellent corrosion protection
  • Good chemical resistance against a wide range of chemicals
  • Excellent adhesion to (even to manually prepared) metals including stainless steel, carbon steel, aluminium, brass and copper
  • Thermally stable up to 150°C (302°F) in dry conditions

Applications for Belzona 5851 (HA-Barrier) include:

  • Prevention of corrosion under insulation (CUI)
  • Long-term corrosion protection of hot pipework and process equipment
  • In-situ external coating of process vessels during service operating at high temperature avoiding production downtime

Key technical data:

Working lifeUnlimited *cure will not commence until the product is heated
Time to full cure 100°C (212°F)2 days
Coverage rate (1kg)Theoretical coverage rate for a 2 coat system:
2.4 sq.m. (25 sq.ft.) per kilogram per coat
Volume capacity (1kg)476 cm3 (29
Heat resistanceUp to 150°C (302°F)
Heat distortion temperature (tested per ASTM D648)127°C (261°F) after 7 days cure at 100°C (212°F)
Bonds toAluminium, copper, steel, stainless steel, cast iron, and other metals
Typical applicationsProtection against CUI problems, heat activated coating for live process equipment
Unit size1.5kg, 8kg. Unit sizes may vary locally.


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