BELZONA 1251 (HA-Metal)

A heat-activated metal repair composite for in-situ repair and protection of hot metal surfaces with minimal surface preparation.

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A durable, single component metal repair composite based on a silicon alloy blended with a heat-activated epoxy resin. Designed to repair and protect metal surfaces suffering from Corrosion under Insulation (CUI), Belzona 1251 (HA-Metal) can be easily applied by spatula, applicator or brush.

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, this solvent-free repair composite provides outstanding corrosion protection.

Belzona 1251 (HA-Metal) is ideally suited to be over coated with Belzona 5851 (HA-Barrier) to ensure long-lasting performance.

Key benefits:

  • In-situ application to live equipment operating at high temperature with minimal surface preparation
  • Multi-purpose durable metal repair composite
  • Single pack system, no weighing or mixing required
  • Reduced health and safety risks as it is solvent-free
  • Fast cure allowing equipment to be re-insulated with minimum delay
  • Excellent corrosion protection
  • Impact and abrasion resistance
  • Good chemical resistance against a wide range of chemicals
  • Excellent adhesion to metals including stainless steel, carbon steel, aluminium, brass and copper
  • Does not corrode

Applications for Belzona 1251 (HA-Metal) include:

  • Repair and prevention of Corrosion under Insulation (CUI)
  • Resurface of pitted metal surfaces
  • Repair of thin-wall defects
  • Bonding of doubler plates
  • Leak sealing of pipework

Key technical data:

Working life at 25°C (77°F)Unlimited*
*cure will not commence until the product is heated
Time to mechanical cure 100°C (212°F)1 hour
Tensile shear adhesion (ASTM D1002)2,200 psi (15.2 MPa) after cure at 100°C (212°F) applied to clean, ground steel
Compressive strength (ASTM D695)18,100 psi (124.8 MPa) after 7 days cure at 100°C (212°F)
Temperature resistance180°C (356°F)
Bonds toAluminium, copper, steel, stainless steel, cast iron, and other metals
Typical applicationsRepair and protection of CUI problems, leak repairs, bonding, filling and many more
Unit size750g, 5kg. Unit sizes may vary locally


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