Belzona 4131
Magma-Screed
A two-component epoxy aggregate system providing outstanding protection to concrete from impact, abrasion, and chemical attack.
A two-component system of high molecular weight polymers and oligomers incorporated with an aggregate mix, providing excellent protection to concrete from impact, abrasion, and chemical attack.
- SeriesBelzona 4000 Series
- Documents4
Overview of Belzona 4131
Belzona 4131 (Magma-Screed) is a heavy-duty two-component epoxy resin system blended with a graded mineral aggregate, providing outstanding mechanical and chemical resistance to concrete substrates. Once fully cured, the system offers excellent protection against impact, heavy abrasion, and aggressive chemical attack — ideal for industrial floors, ramps, machinery production areas, and chemical storage zones.
The pre-blended aggregate Base mixes 30:1 by weight with the liquid Solidifier, producing a screedable, troweled compound suitable for application as floor and wall systems. With a heat distortion temperature of 100°F (38°C) and thermal stability up to 300°F (150°C) dry / 140°F (60°C) wet, plus chemical resistance to inorganic acids, alkalis, salt solutions, hydrocarbons, and mineral oils, Belzona 4131 is engineered for the most demanding industrial environments.
Key Benefits
Exceptional compressive strength for load-bearing applications and demanding mechanical environments
Outstanding protection against wear, impact and abrasion
Outstanding resistance to a wide range of chemicals
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
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Floor Problem Areas
6 applications- Chemical containment area floorsChemical storage tank topsLearn more
- Concrete & stone repair/resurfacingHorizontal repair of concrete and stone substrates damaged by impact, abrasion, or acid attackLearn more
- Building floors, industrial surfacesIndustrial concrete floors fail at construction joints, equipment bases, and forklift wheel paths where impact and abrasion combine to spall the surface and expose rebar…Learn more
- Concrete floor and structural repairConcrete cracks fall into two failure modes that need different repair products: shrinkage and thermal cracks that are dimensionally stable, and live cracks driven by on…Learn more
- Industrial floors under chemical & mechanical attackIndustrial floors, walls, and stairways exposed to mechanical and chemical attackLearn more
- Warehouse & forklift traffic floorsWarehouse forklift traffic surfaces and loading docksLearn more
Tanks & Chemical Containment Areas
1 applicationTechnical Data
Composition
- Type
- Two-component aggregate system with high molecular weight polymers and oligomers
- Mixing Ratio by Weight (Base : Solidifier)
- 30 : 1
Components
- Base
- Damp sand appearance, gray, density 2.3–2.5 g/cm³
- Solidifier
- Clear liquid, light or amber, density 0.99 g/cm³
Application
- Working Life
- 30 minutes at 77°F (25°C) — varies with temperature
- Coverage Rate
- 15 ft² (1.4 m²) at ¼ inch (6 mm) film thickness per 20 kg unit
- Volume Capacity
- 524 in³ (8,590 cm³) per 20 kg unit
Compressive Properties
- Compressive Strength (ASTM D695)
- 10,500 psi (72.39 MPa)
Flexural Properties
- Flexural Strength (ASTM D790)
- 4,600 psi (31.71 MPa)
Adhesion
- Tensile Shear, polymeric binder to steel (ASTM D1002)
- 2,400 psi (169 kgf/cm²)
- PosiTest Pull-off (ASTM D4541), dry concrete
- 600 psi (4.14 MPa)*
- PosiTest Pull-off (ASTM D4541), wet concrete
- 425 psi (2.93 MPa)*
- * Cohesive failure of substrate — bond exceeds substrate strength
Abrasion Resistance (Taber, ASTM D4060, 1 kg load, per 1,000 cycles)
- Wet (H10 wheels)
- 685 mm³
Impact Properties
- Izod Impact Strength (ASTM D256)
- 0.35 ft·lb/in (19 J/m)
Heat Resistance
- Heat Distortion Temperature (ASTM D648)
- 100°F (38°C)
- Thermal stability
- 300°F (150°C) dry, 140°F (60°C) wet, down to -40°F (-40°C)
Chemical Resistance
- Excellent resistance to inorganic acids up to 10% concentration
- Excellent resistance to alkalis up to 20% concentration
- Resistant to salt solutions, hydrocarbons, and mineral oils
- Refer to the Chemical Resistance chart for detailed compatibility information
Shelf Life
- Separate Base and Solidifier components have a shelf life of 5 years from date of manufacture in original unopened containers stored between 41°F (5°C) and 86°F (30°C)
Working Life
From commencement of mixing, use within:
- 50°F (10°C)
- 2 hours
- 59°F (15°C)
- 1 hour
- 68°F (20°C)
- 45 minutes
- 77°F (25°C)
- 30 minutes
Curing Time
For ¼ in. (6 mm) film thickness — reduced for thicker, extended for thinner sections
At 41°F (5°C)
- Pedestrian traffic
- 16 hours
- Full load bearing capability
- 5 days
- Full chemical resistance
- 18 days
At 59°F (15°C)
- Pedestrian traffic
- 9 hours
- Full load bearing capability
- 3 days
- Full chemical resistance
- 12 days
At 77°F (25°C)
Belzona 4131 must not be exposed to moisture until full cure has been achieved or surface whitening will occur.
- Pedestrian traffic
- 6 hours
- Full load bearing capability
- 1 day
- Full chemical resistance
- 7 days
Service Temperature Limits
- Service Temperature (dry)
- Up to 300°F (150°C)
- Service Temperature (wet)
- Up to 140°F (60°C)
- Minimum Service Temperature
- -40°F (-40°C)
- Storage Temperature
- 41°F (5°C) to 86°F (30°C) in unopened containers
- Heat Distortion Temperature (ASTM D648)
- 100°F (38°C)
Product PDFs
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Frequently Asked Questions
What is Belzona 4131 (Magma-Screed) used for?
Belzona 4131 (Magma-Screed) is a 3-part epoxy resurfacing screed designed for the repair and resurfacing of concrete and stonework. It provides a smooth, hard-wearing surface with outstanding abrasion and chemical resistance, ideal for industrial floors, walkways, and high-traffic areas.
What is the mixing ratio of Belzona 4131 (Magma-Screed)?
The mixing ratio of Belzona 4131 (Magma-Screed) is 30 : 1 (Base : Solidifier) by weight, with Belzona 4131 Aggregate added to the resin to achieve a screed consistency. Please see the Product Specification Sheet (PSS) for more information.
How do you apply Belzona 4131 (Magma-Screed)?
To apply Belzona 4131 (Magma-Screed), the surface must be clean, firm, and dry, and conditioned with Belzona 4911 (Magma TX Conditioner). Mix the Base and Solidifier thoroughly, then slowly add the Belzona 4131 Aggregate to achieve a screed consistency. Apply within 30 minutes at 77°F (25°C) onto the conditioned surface using a trowel and screed bar, then compact and finish to the desired profile. Please see the Instructions for Use (IFU) for more information.
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