Belzona 4331
Magma CR2
A high-performance barrier coating optimized for hot organic acid resistance up to 194°F (90°C).
A high-performance, two-component barrier coating optimized for resistance to hot organic acids such as acetic acid, with excellent resistance to a broad range of other chemicals.
- SeriesBelzona 4000 Series
- Approvals1
- Documents4
Overview of Belzona 4331
Belzona 4331 (Magma CR2) is a high-performance, two-component barrier coating optimized for resistance to hot organic acids — such as acetic acid — with excellent resistance to a broad range of other chemicals. The system isolates concrete and metal substrates from deteriorating chemical environments at service temperatures up to 194°F (90°C), making it ideal for hot acidic process environments.
Brush- or spray-applied for use on acid retaining walls, chemical drains and channels, tanks, walkways with non-slip aggregate, pump bases and casings, and tank pads. The 1.5 kg unit covers 21.0 sq.ft. (1.95 m²) at the recommended 20 mil (500 micron) DFT per coat. Force-cured at 80°C (180°F) for 4 hours for optimum chemical resistance. Tg of 95°C (203°F) at 100°C post-cure.
Key Benefits
Outstanding resistance to a wide range of chemicals
Outstanding performance under elevated temperature conditions including dry heat and steam exposure
Exceptional compressive strength for load-bearing applications and demanding mechanical environments
100% solids formulation reduces health and safety risks in confined spaces with no shrinkage on cure
No solvents, no shrinkage during cure
Bonds strongly to virtually any rigid surface
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Tanks & Chemical Containment Areas
4 applications- Chemical containment liningProtection of tanks and secondary containment areas from chemicals and the effects of corrosionLearn more
- Acid-retaining walls, drains & channelsAcid retaining walls subject to thermal cycling or substrate movementLearn more
- Anti-slip walkways & access surfacesWalkways with non-slip aggregate incorporatedLearn more
- Pump bases & tank padsPump bases, pump casings, and tank padsLearn more
Technical Data
Composition
- Type
- Two-component barrier coating optimized for hot organic acid resistance
- Mixing Ratio by Weight (Base : Solidifier)
- 10.75 : 1
- Mixing Ratio by Volume (Base : Solidifier)
- 7.16 : 1
Components
- Base
- Thixotropic liquid, red, gel strength 150 g/cm³, density 1.58 g/cm³
- Solidifier
- Clear liquid, amber, density 1.05 g/cm³
Mixed Properties
- Density
- 1.52 g/cm³
- Sag Resistance
- Greater than 50 thou
- Time to Peak Exotherm at 68°F (20°C)
- 28 minutes
- Peak Exotherm Temperature
- 320°F (160°C)
- Useable Life at 68°F (20°C)
- 20 minutes
Application & Coverage
- Recommended DFT per Coat
- 20 mils (500 micron)
- Coverage (1.5 kg unit)
- 21.0 sq.ft. (1.95 m²) at 20 mil DFT
- Volume Capacity
- 59.5 cu.in. (975 cm³) per 1.5 kg unit
- Force Cure (optimum)
- 80°C (180°F) for 4 hours
- Note
- Application to rough or irregular surfaces may reduce coverage by 20–25%. Below 59°F (15°C) cure times extend significantly and chemical resistance is reduced.
Compressive Properties (ASTM D695)
68°F/20°C cure & test
- Compressive Strength
- 18,946 psi (130.6 MPa)
- Proportional Limit
- 13,473 psi (92.9 MPa)
- Young's Modulus
- 2.45 × 10⁵ psi (1,686.5 MPa)
212°F/100°C post-cure & 68°F/20°C test
- Compressive Strength
- 30,482 psi (210.2 MPa)
- Proportional Limit
- 16,729 psi (115.3 MPa)
- Young's Modulus
- 2.45 × 10⁵ psi (1,691.1 MPa)
Flexural Properties
- Flexural Strength (ASTM D790)
- 6,500 psi (44.8 MPa)
Adhesion
- Tensile Shear, grit blasted steel (ASTM D1002)
- 2,300 psi (15.9 MPa)
- Pull-off, grit blasted steel (ASTM D4541/ISO 4624)
- 4,770 psi (32.9 MPa)
Hardness
- Barcol 934-1 (ambient cure)
- 38
- Barcol 934-1 (100°C post-cure)
- 44
- Barcol 935 (ambient cure)
- 87
- Barcol 935 (100°C post-cure)
- 90
Impact Resistance (Izod Pendulum, ASTM D256)
68°F/20°C cure & test
- Reversed Notched
- 5.9 KJ/m² (74.9 J/m)
- Un-Notched
- 5.9 KJ/m² (74.0 J/m)
212°F/100°C post-cure
- Reversed Notched
- 5.2 KJ/m² (66.3 J/m)
- Un-Notched
- 6.3 KJ/m² (55.5 J/m)
Heat Resistance
- HDT (68°F/20°C cure, 264 psi fiber stress)
- 142°F (61°C)
- HDT (122°F/50°C cure)
- 187°F (86°C)
- HDT (212°F/100°C cure)
- 217°F (103°C)
- HDT (302°F/150°C cure)
- 225°F (124°C)
- DSC degradation onset (ISO 11357)
- 410°F (210°C)
- Service
- down to -40°F (-40°C); wet up to 194°F (90°C) per chemical resistance limitations
Chemical Resistance
- Optimized for hot organic acids up to 194°F (90°C), including acetic acid
- Excellent resistance to a broad range of other chemicals
- Recommended that all proposed applications are checked with TKL at Harrogate or Miami for suitability before proceeding
Shelf Life
- Separate Base and Solidifier components have a 3-year shelf life 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:
- 59°F (15°C)
- 45 minutes
- 68°F (20°C)
- 20 minutes
- 86°F (30°C)
- 15 minutes
Curing Time
Allow Belzona 4331 to solidify before subjecting it to the conditions indicated:
At 59°F (15°C)
- Pedestrian traffic
- 12 hours
- Chemical resistance
- 7 days
At 68°F (20°C)
- Pedestrian traffic
- 8 hours
- Chemical resistance
- 5 days
At 86°F (30°C)
For optimum chemical resistance: allow to solidify for 12 hours at 68°F (20°C), then force cure at 180°F (80°C) for 4 hours.
- Pedestrian traffic
- 4 hours
- Chemical resistance
- 3 days
Service Temperature Limits
- Wet Heat Resistance
- Up to 194°F (90°C) per chemical resistance limitations
- Dry Heat Resistance
- DSC degradation onset 410°F (210°C)
- Lower Service Temperature
- -40°F (-40°C)
- HDT (68°F/20°C cure)
- 142°F (61°C)
- HDT (122°F/50°C cure)
- 187°F (86°C)
- HDT (212°F/100°C cure)
- 217°F (103°C)
- HDT (302°F/150°C cure)
- 225°F (124°C)
- Storage Temperature
- 41°F (5°C) to 86°F (30°C) in unopened containers
- Application
- Below 59°F (15°C) cure times extend significantly and chemical resistance is reduced
Certifications & Approvals
Product PDFs
Gallery
Videos
Frequently Asked Questions
What is Belzona 4331 (Magma CR2) used for?
Belzona 4331 (Magma CR2) is a high-performance, chemical-resistant epoxy coating designed for the protection of concrete and metal substrates exposed to a wide range of aggressive chemicals, including strong acids and alkalis. It is ideal for tank linings, secondary containment areas, and process equipment.
What is the mixing ratio of Belzona 4331 (Magma CR2)?
The mixing ratio of Belzona 4331 (Magma CR2) is 10.75 : 1 (Base : Solidifier) by weight and 7.16 : 1 (Base : Solidifier) by volume. Please see the Product Specification Sheet (PSS) for more information.
How do you apply Belzona 4331 (Magma CR2)?
To apply Belzona 4331 (Magma CR2), the surface must be clean, firm, and dry, free of rust, paint, and other surface contaminants, and conditioned with Belzona 4911 (Magma TX Conditioner). Add the Solidifier to the Base and mix thoroughly until a completely homogeneous liquid is achieved. Apply to the conditioned surface using a short-bristled brush, roller, or squeegee. A second coat may be applied within the recommended overcoat window. Please see the Instructions for Use (IFU) for more information.
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