Belzona 5811
Immersion Grade
Epoxy Coating for Corrosion and Chemical Protection Under Immersion
A 2-part epoxy coating that delivers outstanding chemical resistance and protects equipment operating under immersion in aqueous solutions up to 122°F (50°C) from the effects of corrosion.
- SeriesBelzona 5000 Series
- Approvals1
- Documents4
Overview of Belzona 5811
Belzona 5811 (Immersion Grade) is a 2-part, solvent-free epoxy coating that delivers outstanding chemical resistance and protects equipment operating under immersion in aqueous solutions up to 122°F (50°C) from corrosion damage.
This 100% solids material can be easily applied by brush, roller, squeegee, injection, or airless spray to virtually any metallic and non-metallic surface, including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass, and aluminum.
Typical applications include tanks, bunds, process vessels, pumps, pipes, heat exchangers, clarifiers, secondary containment areas, and pipework, plus use as a high-strength structural adhesive for metal bonding.
Belzona 5811 holds Product Type Approval from the American Bureau of Shipping (ABS) and is also a WRAS Approved Material. For potable water applications, see Belzona 5811DW2.
Key Benefits
Effective protection of equipment operating under immersion conditions from corrosion damage.
Reduced health and safety risks as it is 100% solids, with no solvents required.
Spray- or brush-applied onto metallic surfaces, concrete, brick and others. Cures in low-temperature and damp conditions.
Resists ethanol, sulfuric acid, hydrochloric acid, hydrobromic acid, potassium hydroxide, ethyl acetate, methyl acetate, ethylene glycol, ammonia solution, diethanolamine, hydrocarbons, sea water and crude oil.
Eliminates the need for equipment replacement and reduces downtime.
Excellent adhesion to virtually any surface including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass and aluminum.
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
HVAC & Refrigeration Equipment
2 applications- Chiller Repair - HVACChiller failures concentrate at the evaporator tube ends, condenser water-side flange faces, and refrigerant-side weld points where bi-metallic corrosion and erosion com…Learn more
- HVAC duct & surfacesHVAC ductwork corrodes from the inside out where condensation pools at low points, joints leak conditioned air across the seal, and duct coatings designed for original c…Learn more
Tanks & Chemical Containment Areas
2 applications- General metal and concrete protectionPlant equipment seldom faces a single chemical exposure, and the right coating system is chosen by the worst-case combination of acid, alkali, solvent, and temperature r…Learn more
- Tank base water ingress preventionWater ingress at the tank-to-foundation rim is the dominant cause of underside corrosion on aboveground storage tanks, attacking the floor plate from beneath the rim sea…Learn more
Wall Problem Areas
2 applications- Food & drink area coatingsFood and beverage processing surfaces face daily caustic wash-down, hot CIP cycles, and bacterial-growth audit pressure that ordinary industrial coatings cannot pass at…Learn more
- Wall problem areasProcess-area walls take splash, mist, and spill exposure that ordinary wall paint cannot survive, particularly at the floor-wall junction where puddled product sits betw…Learn more
Buildings & Structural Steel
1 applicationFloor Problem Areas
1 applicationValves, Pipes & Fittings
1 applicationWater & Wastewater Treatment Plant
1 applicationTechnical Data
Mechanical Properties (28-day cure at 22°C / 72°F)
- Shore D Hardness (ASTM D2240)
- 84
- Barcol Hardness (ASTM D2583)
- 77
- König Pendulum (ISO 1522)
- 118 seconds
- Compressive Strength (ASTM D695)
- 6,600 psi (45.5 MPa)
- Flexural Strength (ASTM D790)
- 7,190 psi (49.6 MPa)
- Flexural Modulus
- 3.4 × 10⁵ psi (2.3 GPa)
- Tensile Strength
- 3,730 psi (25.7 MPa)
- Young's Modulus
- 4.51 × 10⁴ psi (311 MPa)
- Elongation
- 1.96%
- Izod Impact (un-notched, ASTM D256)
- 2.66 ft-lb/in² (5.6 kJ/m²)
Adhesion (28-day cure)
- Pull-Off on Grit-Blasted Steel (ASTM D4541)
- 4,800 psi (33.1 MPa)
- Tensile Shear on Mild Steel (ASTM D1002)
- 3,590 psi (24.7 MPa)
- Tensile Shear on Stainless Steel
- 3,070 psi (21.2 MPa)
- Tensile Shear on Aluminum
- 2,530 psi (17.4 MPa)
- Tensile Shear on Brass
- 2,920 psi (20.1 MPa)
- Tensile Shear on Copper
- 2,280 psi (15.7 MPa)
Corrosion & Immersion Resistance
- Atlas Cell Cold-Wall Test (NACE TM 0174-A)
- No rusting (D610 = 10) or blistering (D714 = 10) after 6 months in DI water at 104°F
- Seawater Immersion (ISO 2812-2)
- No blistering, rusting, cracking, or delamination after 6 months at 122°F (50°C)
- Cathodic Disbondment (ASTM G8 Method B)
- ECD 0.35 in (9.0 mm)
- Mandrel Bend (NACE SP0394 H4.2)
- No cracks, tears, or disbonding at 0°F over 2-inch mandrel
Electrical Properties
- Dielectric Strength (ASTM D149)
- 48.7 kV/mm
- Dielectric Constant (ASTM D150)
- 2.82
- Surface Resistivity (ASTM D257)
- 4.4 × 10⁹ Ω/sq
Working Life
- At 68°F (20°C)
- 1 hour 45 minutes from start of mixing
Cure Schedule
Cure times vary depending on ambient conditions. Refer to the Belzona Instructions for Use for specific cure-to-service guidance.
Glass Transition Temperature
- Tg (ISO 11357-2, 7-day cure)
- 113°F (45°C)
Service Temperature Limits
- Continuous immersion service
- Up to 122°F (50°C) in aqueous solutions
- Application temperature range
- 50 - 86°F (10 - 30°C)
- Dry service down to
- -40°F (-40°C)
- Degradation temperature (DSC, ISO 11357)
- 320°F (160°C)
- Glass transition temperature (Tg)
- 113°F (45°C)
Mixing & Application
Certifications & Approvals
Product PDFs
Gallery
Frequently Asked Questions
Does Belzona 5811 prevent corrosion?
Yes. Belzona 5811 (Immersion Grade) is a 2-part epoxy coating specifically designed for protection against corrosion damage to equipment operating under immersion in aqueous solutions. It is suitable for continuous immersion in aqueous solutions up to 122°F (50°C).
What is an immersion coating?
An immersion coating is a protective layer applied to surfaces in continuous contact with liquids such as water, oil or chemicals. Belzona 5811 (Immersion Grade) is a 2-part epoxy immersion coating that resists chemical attack, erosion, and corrosion to deliver long-term protection for metal and concrete surfaces in harsh environments.
What approvals does Belzona 5811 hold?
Belzona 5811 holds a Product Type Approval from the American Bureau of Shipping (ABS) under certificate numbers 22-2219786-PDA and 22-2219786-PDA-DUP, and is also a WRAS Approved Material. Belzona 5811DW2 is a related variant for potable water applications.
Related Products
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