Belzona 1251
HA-Metal
Heat-activated repair compound for hot surfaces operating at 70-150°C (158-302°F).
A single-component heat-activated paste for repair and protection of hot metal surfaces and equipment suffering from corrosion under insulation.
- SeriesBelzona 1000 Series
- Documents4
Overview of Belzona 1251
A single component heat-activated paste grade system based on a silicon steel alloy blended with a heat-activated resin. When cured, the material is durable and corrosion resistant.
Belzona 1251 (HA-Metal) is designed for the repair and protection of metal surfaces whilst in service. This heat-activated material can be applied directly onto hot surfaces (158-302°F / 70-150°C) with minimal surface preparation, avoiding production downtime.
Key Benefits
Bonds strongly to virtually any rigid surface
Cure activates only when product is heated, providing unlimited working life until applied to hot surfaces
Cures rapidly even at low temperatures for fast back in service time
Easy to mix and apply without specialist tools
Outstanding resistance to corrosion in salt spray and chemical environments
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Valves, Pipes & Fittings
5 applications- Shimming & equipment reseatingShimming and reseating of irregular equipmentLearn more
- Crack & hole repair on casings & equipmentRepair of cracks and holes on engine and pump casings, pipes, tanks and other equipmentLearn more
- Structural metal bondingHigh strength structural adhesive for metal bondingLearn more
- Corrosion pit & wall defect rebuildingResurface of pitted metal surfacesLearn more
- Pipe & tank leak sealingRepair of leaking pipes and tanksLearn more
Technical Data
Mechanical Properties
- Compressive Strength (158°F cure)
- 14,515 psi (100.1 MPa)
- Compressive Strength (212°F cure)
- 13,259 psi (91.4 MPa)
- Compressive Modulus
- 2.30 × 10⁵ psi (1,588.5 MPa)
- Shore D Hardness (Post-cure)
- 88
- Barcol Hardness 935 (Post-cure)
- 97
- Impact Resistance (Izod, reverse notched)
- 57.7 J/m
- Impact Resistance (Izod, un-notched)
- 64.0 J/m
Adhesion (Tensile Shear)
- Clean ground steel (158°F cure)
- 2,350 psi (16.2 MPa)
- Clean ground steel (212°F cure)
- 2,475 psi (17.1 MPa)
- Clean ground steel (248°F cure)
- 3,200 psi (22.1 MPa)
- Rusty steel ISO 8501-1 St 2 (212°F cure)
- 1,200 psi (8.3 MPa)
- Rusty steel ISO 8501-1 St 3 (212°F cure)
- 2,100 psi (14.5 MPa)
- Tensile Strength (7-day, 158°F cure)
- 8,700 psi (60.0 MPa)
- Tensile Strength (7-day, 212°F cure)
- 9,000 psi (62.1 MPa)
Heat & Environmental Resistance
- Heat Distortion Temperature (158°F cure)
- 221°F (105°C)
- Heat Distortion Temperature (212°F cure)
- 243°F (117°C)
- Heat Distortion Temperature (302°F cure)
- 226°F (108°C)
- Dry Heat Resistance
- 410°F (210°C)
- Salt Spray Resistance
- 5,000 hours, no visible corrosion
Working Life
Cure will not commence until the product is heated, hence the working life of Belzona 1251 is effectively unlimited.
Cure Times by Temperature
At 158°F (70°C)
- Light loading
- 75 minutes
- Full mechanical or thermal loading
- 5 hours
- Optimum heat resistance
- 7 days
At 185°F (85°C)
- Light loading
- 25 minutes
- Full mechanical or thermal loading
- 2 hours
- Optimum heat resistance
- 5 days
At 212°F (100°C)
- Light loading
- 15 minutes
- Full mechanical or thermal loading
- 60 minutes
- Optimum heat resistance
- 3 days
At 239°F (115°C)
- Light loading
- 15 minutes
- Full mechanical or thermal loading
- 60 minutes
- Optimum heat resistance
- 1 day
Service Temperature Limits
- Lower temperature limit
- -40°C (-40°F)
- Upper temperature limit (dry)
- 105°C (221°F)
- Upper temperature limit (wet)
- 90°C (194°F)
Mixing & Application
Product PDFs
Gallery
Frequently Asked Questions
What is Belzona 1251 used for?
Belzona 1251 is a 2-part epoxy composite for the rapid repair and rebuilding of metal components in emergency situations. It is designed for quick application and fast return to service on pumps, pipework, valves, and similar equipment where prolonged shutdown is not acceptable.
Is Belzona 1251 machinable?
Yes. Belzona 1251 cures to a fully machinable composite that can be drilled, tapped, sanded, ground, and milled with conventional metalworking tools, allowing precise restoration of dimensions and profiles after repair.
What surfaces does Belzona 1251 bond to?
Belzona 1251 has excellent adhesion to clean, abrasive-blasted carbon steel, stainless steel, and many other metals. Substrates should be free of oil, grease, loose corrosion, and scale prior to application for optimal adhesion.
Related Products
Need Belzona 1251 applied
on your asset?
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