Belzona 4141
Magma-Build
A lightweight, two-component epoxy compound for rebuilding severely damaged vertical and overhead concrete and stone surfaces.
A two-component, epoxy-based, lightweight, non-porous repair compound specifically designed for rebuilding severely damaged or worn vertical and overhead concrete and stone surfaces.
- SeriesBelzona 4000 Series
- Documents4
Overview of Belzona 4141
Belzona 4141 (Magma-Build) is a two-component, epoxy-based, lightweight, non-porous repair compound specifically engineered for rebuilding severely damaged or worn vertical and overhead concrete and stone surfaces. Its lightweight, sag-resistant formulation enables build-up to 127 mm (5 inches) thick on vertical surfaces and 76 mm (3 inches) thick overhead with minimal support during application.
Used with Belzona 4911 (Magma TX Conditioner) as a primer for excellent substrate adhesion, Belzona 4141 is ideal for spalled concrete, weathered stonework, refurbishment of decorative mouldings, archways, windowsills, walls, bridges, and cosmetic repairs. The system delivers cohesive substrate failure adhesion of up to 4.2 MPa (605 psi) on damp concrete and zero slump at 100mm (4 inches) at 68°F.
Key Benefits
Lightweight material that will not overload existing structures
Exceptional compressive strength for load-bearing applications and demanding mechanical environments
No solvents, no shrinkage during cure
100% solids formulation reduces health and safety risks in confined spaces with no shrinkage on cure
Bonds strongly to virtually any rigid surface
High tensile and tear strength for demanding mechanical environments
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Wall Problem Areas
2 applicationsBuildings & Structural Steel
1 applicationTanks & Chemical Containment Areas
1 applicationTechnical Data
Composition
- Type
- Two-component, epoxy-based, lightweight, non-porous repair compound
- Mixing Ratio by Weight (Base : Solidifier)
- 8 : 1
- Mixing Ratio by Volume (Base : Solidifier)
- 13 : 1
- Required Primer
- Belzona 4911 (Magma TX Conditioner)
Components
- Base Aggregate
- Damp sand appearance, gray or stone, density 0.80–0.86 g/cm³ (lightweight)
- Solidifier
- Clear mobile liquid, amber, density 0.97 g/cm³
Application
- Working Life
- 30 minutes at 20°C (68°F) — varies with temperature
- Vertical Build-up
- Up to 127 mm (5") with minimal support
- Overhead Build-up
- Up to 76 mm (3") with minimal support
- Sag Resistance
- No slump at 100 mm (4") at 20°C (68°F)
- Volume Capacity (theoretical)
- 9,805 cm³ (598 in³) per 8 kg unit
- Volume Capacity (practical)
- Up to 11,000 cm³ (671 in³) per 8 kg unit — varies with compaction due to lightweight nature
Compressive Properties (ASTM D695, 20°C/68°F, 7-day cure)
- Compressive Strength (Yield/Break, standard)
- 19.8 MPa (2,870 psi)
- Compressive Strength (heavily compacted)
- 25.4 MPa (3,680 psi)
- Compressive Modulus (standard)
- 930 MPa (1.3 × 10⁵ psi)
- Compressive Modulus (heavily compacted)
- 1,470 MPa (2.1 × 10⁵ psi)
- Proportional Limit (standard)
- 41.1 MPa (5,960 psi)
- Proportional Limit (heavily compacted)
- 43.4 MPa (6,290 psi)
Flexural Properties (ASTM D790, 20°C/68°F, 7-day cure)
- Flexural Strength
- 17.4 MPa (2,530 psi)
- Flexural Modulus
- 3,800 MPa (5.5 × 10⁵ psi)
Adhesion (ASTM D4541, PosiTest Pull-off)
- Dry concrete
- 3.6 MPa (520 psi)*
- Damp concrete
- 4.2 MPa (605 psi)*
- * Cohesive failure within substrate — bond exceeds substrate strength
Abrasion Resistance (Taber, ASTM D4060, 1 kg load, per 1,000 cycles)
- Dry (CS17 wheels)
- 374 mm³ (0.02 in³)
Impact Resistance (Izod Pendulum, ASTM D256)
- Reversed notched
- 1.0 KJ/m² (10.1 J/m)
- Un-notched
- 1.5 KJ/m² (18.3 J/m)
Heat Resistance
Heat Distortion Temperature (ASTM D648, 7-day cure)
- 5°C (41°F) cure
- HDT 29°C (84°F)
- 10°C (50°F) cure
- HDT 31°C (88°F)
- 20°C (68°F) cure
- HDT 41°C (106°F)
- 40°C (104°F) cure
- HDT 45°C (113°F)
Dry Heat Resistance
- DSC degradation onset (ISO 11357)
- 155°C (311°F)
- Minimum service temperature
- -40°C (-40°F)
Shelf Life
- Separate Base and Solidifier components have a shelf life of 5 years from date of manufacture in original unopened containers stored between 5°C (41°F) and 30°C (86°F)
Working Life
From commencement of mixing, use within:
- 41°F (5°C)
- 80 minutes
- 50°F (10°C)
- 50 minutes
- 68°F (20°C)
- 30 minutes
- 86°F (30°C)
- 20 minutes
- 104°F (40°C)
- 15 minutes
Curing Time
Allow Belzona 4141 to solidify before subjecting it to the conditions indicated:
At 41°F (5°C)
- Dimensionally stable
- 8 hours
- Full mechanical strength
- 3 days
At 50°F (10°C)
- Dimensionally stable
- 6 hours
- Full mechanical strength
- 2.5 days
At 68°F (20°C)
- Dimensionally stable
- 3 hours
- Full mechanical strength
- 2 days
At 86°F (30°C)
- Dimensionally stable
- 2 hours
- Full mechanical strength
- 16 hours
At 104°F (40°C)
- Dimensionally stable
- 1 hour
- Full mechanical strength
- 2 hours
Service Temperature Limits
- Service Temperature (dry, max)
- 155°C (311°F) — DSC degradation onset
- Minimum Service Temperature
- -40°C (-40°F)
- Application Temperature Range
- 5°C (41°F) to 40°C (104°F) — HDT varies with cure temperature
- Storage Temperature
- 5°C (41°F) to 30°C (86°F) in unopened containers
Product PDFs
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Frequently Asked Questions
What is Belzona 4141 (Magma-Build) used for?
Belzona 4141 (Magma-Build) is a 2-part lightweight epoxy paste-grade composite designed for filling, repairing, and rebuilding concrete and stonework on horizontal, vertical, and overhead surfaces. Its low-density formulation makes it ideal for non-slump applications without sagging.
What is the mixing ratio of Belzona 4141 (Magma-Build)?
The mixing ratio of Belzona 4141 (Magma-Build) is 8 : 1 (Base : Solidifier) by weight and 13 : 1 (Base : Solidifier) by volume. Please see the Product Specification Sheet (PSS) for more information.
How do you apply Belzona 4141 (Magma-Build)?
To apply Belzona 4141 (Magma-Build), the surface must be clean, firm, and dry, free of paint, oils, and other contaminants, and conditioned with Belzona 4911 (Magma TX Conditioner). Mix the entire contents of the Solidifier into the Base unit until a homogeneous color is achieved. Within 30 minutes at 68°F (20°C), apply to the conditioned surface using a trowel or spatula in single passes up to the recommended thickness. The material is non-slump on vertical and overhead surfaces. Please see the Instructions for Use (IFU) for more information.
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