Belzona 1221
Super E-Metal
A fast-curing metal repair composite for high speed emergency repairs.
A fast-curing 2-part epoxy composite for high speed emergency metal repair packaged in pocket-sized sachets.
- SeriesBelzona 1000 Series
- Approvals2
- Documents6
Overview of Belzona 1221
A 2-part composite material for metal repair based on a silicone steel reinforced polymer system. Due to its fast-curing characteristics, this repair material is ideal for emergency repair situations. It can be machined using conventional tools and provides a permanent metal bonding or rebuilding solution.
Belzona 1221 is packaged in individual, pocket-sized sachets for convenience, making it ideal for repair kits and emergency situations.
Key Benefits
Cures rapidly even at low temperatures for fast back in service time
Easy to mix and apply without specialist tools
Bonds strongly to virtually any rigid surface
Machinable using conventional tools after cure
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
6 applications- Flange sealing & repairSealing of joints and flangesLearn more
- 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
- Corrosion pit & wall defect rebuildingResurface of pitted metal surfacesLearn more
- Pipe & tank leak sealingRepair of leaking pipes and tanksLearn more
- Shaft & hydraulic ram repairRepair of damaged shafts and hydraulic ramsLearn more
Technical Data
Mechanical Properties
- Compressive Strength (68°F cure)
- 7,403 psi (51.0 MPa)
- Compressive Strength (post-cure)
- 8,559 psi (59.0 MPa)
- Compressive Modulus
- 1.57 × 10⁵ psi (1,082 MPa)
- Tensile Strength (68°F cure)
- 5,443 psi (37.53 MPa)
- Tensile Strength (212°F cure)
- 5,475 psi (37.75 MPa)
- Young's Modulus (68°F cure)
- 4.68 × 10⁵ psi (3,226 MPa)
- Elongation
- 1.80%
- Flexural Strength
- 8,600 psi (59.3 MPa)
- Shore D Hardness
- 80
- Barcol Hardness 935
- 71
- Impact Resistance (Izod, reverse notched, 68°F cure)
- 68.8 J/m
- Impact Resistance (Izod, un-notched, 68°F cure)
- 106.4 J/m
Adhesion
- Tensile Shear, Mild Steel
- 2,500 psi (17.2 MPa)
- Tensile Shear, Copper
- 1,800 psi (12.4 MPa)
- Tensile Shear, Aluminum
- 1,500 psi (10.3 MPa)
- Tensile Shear, Polyethylene
- 815 psi (5.6 MPa)
- Tensile Shear, Polypropylene
- 665 psi (4.6 MPa)
- Pull-Off Adhesion (Grit Blasted Steel)
- 1,500 psi (10.3 MPa)
Heat & Environmental Resistance
- Heat Distortion Temperature (Ambient cure)
- 124°F (51°C)
- Heat Distortion Temperature (100°C post-cure)
- 174°F (79°C)
- Coefficient of Thermal Expansion
- 81.5 ppm/°C
- Salt Spray Resistance
- 5,000 hours, no visible corrosion
- Water Uptake (3 days at 77°F)
- 1%
Electrical Properties
- Dielectric Strength
- 218 V/mil (8,720 V/mm)
- Dielectric Constant (1 kHz / 1 MHz)
- 4 / 4
- Dissipation Factor (1 kHz / 1 MHz)
- < 0.0005
- Surface Resistivity
- 1.5 × 10¹⁵ Ω
- Volume Resistivity
- 6.3 × 10¹⁵ Ω·cm
Chemical Analysis
- Fluoride
- 54 ppm
- Chloride
- 150 ppm
- Sulfur
- 191 ppm
- Lead, Mercury, Cadmium
- Not Detected
Working Life
- 77°F (25°C)
- Use all mixed material within 3 minutes
Curing Time
Cure times will vary depending on ambient conditions and will be reduced for thicker sections and extended for thinner applications.
At 50°F (10°C)
- No loading or immersion
- 16 minutes
- Machining and/or light loading
- 50 minutes
- Full mechanical or thermal loading
- 100 minutes
- Immersion in chemicals
- 36 hours
At 59°F (15°C)
- No loading or immersion
- 15 minutes
- Machining and/or light loading
- 45 minutes
- Full mechanical or thermal loading
- 90 minutes
- Immersion in chemicals
- 30 hours
At 68°F (20°C)
- No loading or immersion
- 14 minutes
- Machining and/or light loading
- 40 minutes
- Full mechanical or thermal loading
- 75 minutes
- Immersion in chemicals
- 24 hours
At 77°F (25°C)
- No loading or immersion
- 13 minutes
- Machining and/or light loading
- 35 minutes
- Full mechanical or thermal loading
- 60 minutes
- Immersion in chemicals
- 20 hours
Service Temperature Limits
- Lower temperature limit
- -40°C (-40°F)
- Upper temperature limit (dry)
- 70°C (158°F)
- Upper temperature limit (wet)
- 60°C (140°F)
Mixing & Application
Certifications & Approvals
Product PDFs
Gallery
Videos
Frequently Asked Questions
What is Belzona 1221 used for?
Belzona 1221 (Super E-Metal) is a 2-part fast-curing metal repair composite designed for emergency repair situations where rapid return-to-service is essential. It is used for resurfacing pitted metal, sealing leaks, and rebuilding worn metal components when downtime must be minimized.
How fast does Belzona 1221 cure?
Belzona 1221 is engineered for fast cure compared to standard metal repair composites in the 1000 series, allowing return-to-service in significantly less time. Exact working life and cure schedule depend on ambient temperature — consult the Product Specification Sheet for full cure data.
Can Belzona 1221 be machined after cure?
Yes. Like other Belzona metal repair composites, Belzona 1221 cures to a fully machinable state and can be drilled, tapped, ground, sanded, and milled using conventional metalworking tools.
Related Products
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