Belzona 5821
Ceramic Filled Coating
High Performance Ceramic Filled Epoxy Coating for Critical Equipment
A 2-part, ceramic-filled, 100% solids epoxy coating applied by brush or spray for the protection of metallic and non-metallic surfaces operating under immersion in contact with aqueous solutions, with outstanding erosion-corrosion resistance.
- SeriesBelzona 5000 Series
- Documents6
Overview of Belzona 5821
Belzona 5821 is a 2-part, epoxy-based, ceramic-filled, 100% solids coating applied by brush or spray for the protection of metallic and non-metallic surfaces operating under immersion conditions in contact with aqueous solutions.
The product provides outstanding protection from the effects of salt, water, acids, alkalis, alcohols, and hydrocarbons. The ceramic filler contributes excellent erosion-corrosion resistance, especially in flow-turbulent environments.
Belzona 5821 can be applied to virtually any rigid surface including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass, and aluminum. Typical applications include tanks, bunds, pumps, submersible pumps, pipes, heat exchangers, clarifiers, secondary containment areas, and pipework, plus use as a high-strength adhesive for metal bonding.
Key Benefits
Engineered, tightly packed ceramic particles bound into the epoxy resin system create a seamless coating with outstanding erosion resistance, ideal for applications such as water treatment plants.
Solvent-free formulation reduces VOC emissions and health and safety risks during application.
Spray- or brush-applied onto metallic surfaces, concrete, brick and others, with cure in low-temperature and damp conditions.
Resists various aqueous solutions, acids, alkalis, alcohols and hydrocarbons.
Provides outstanding protection for equipment operating in immersed erosive conditions exposed to salt, water, acids, alkalis, alcohols and hydrocarbons.
Can be applied to virtually any rigid surface including cast iron, stainless steel, brass, copper, concrete, wood, fiberglass and aluminum.
Application Areas
Technical Data
Mechanical Properties (7-day cure at 22°C / 72°F)
- Shore D Hardness (ASTM D2240)
- 81
- Barcol Hardness Model 935 (ASTM D2583)
- 75
- König Pendulum (ISO 1522)
- 104 seconds
- Compressive Yield Strength (ASTM D695)
- 5,780 psi (39.9 MPa)
- Flexural Strength (ASTM D790)
- 5,530 psi (38.1 MPa)
- Flexural Modulus
- 3.3 × 10⁵ psi (2,275 MPa)
- Tensile Strength (max)
- 3,150 psi (21.7 MPa)
- Young's Modulus
- 2.4 × 10⁵ psi (1,655 MPa)
- Elongation
- 1.3%
- Izod Impact (notched, ASTM D256)
- 3.14 ft-lb/in² (6.6 kJ/m²)
Adhesion (7-day cure)
- Pull-Off on Grit-Blasted Steel (ASTM D4541)
- 5,290 psi (36.5 MPa)
- Tensile Shear on Mild Steel (ASTM D1002)
- 3,020 psi (20.8 MPa)
- Tensile Shear on Stainless Steel
- 3,000 psi (20.7 MPa)
- Tensile Shear on Aluminum
- 2,770 psi (19.1 MPa)
- Tensile Shear on Brass
- 2,880 psi (19.9 MPa)
- Tensile Shear on Copper
- 2,960 psi (20.4 MPa)
Corrosion & Erosion Resistance
- Atlas Cell (NACE TM 0174)
- No rusting or blistering after 6 months in DI water at 104°F
- Seawater Immersion (ISO 2812-2)
- No blistering, rusting, cracking, or delamination after 6 months at 104°F
- Taber Abrasion (ASTM D4060, 1 kg, dry CS17)
- 86 mm³ loss per 1,000 cycles
- Taber Abrasion (1 kg, wet H10)
- 402 mm³ loss per 1,000 cycles
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.
Service Temperature Limits
- Continuous immersion service
- Up to 122°F (50°C) in aqueous solutions
- Dry service down to
- -40°F (-40°C)
- Degradation temperature (DSC, ISO 11357)
- 320°F (160°C)
Mixing & Application
Product PDFs
Gallery
Videos
Frequently Asked Questions
What makes Belzona 5821 different from other immersion coatings?
Belzona 5821 is a 2-part epoxy-based, ceramic-filled, 100% solids coating designed to protect critical equipment operating under immersion conditions. The ceramic fillers contribute to outstanding erosion-corrosion resistance, making the product especially well suited to areas where flow turbulence accelerates surface wear.
What is the mix ratio and coverage rate of Belzona 5821?
Belzona 5821 mixes 5 parts Base to 1 part Solidifier by weight (3:1 by volume), with a working life of about 1 hour 45 minutes at 68°F (20°C). It should be applied in 2 coats to achieve a minimum total thickness of 16 mils (400 microns), with a theoretical coverage rate of 27 ft²/L (2.5 m²/L) at that thickness.
What chemicals and temperatures does Belzona 5821 resist?
Belzona 5821 is suitable for continuous immersion in aqueous solutions up to 122°F (50°C). It demonstrates excellent resistance to a broad range of chemicals including sea water, salt, alkalis, alcohols, and crude oil, with no blistering, rusting, cracking, or delamination after 6 months immersion in seawater at 104°F (40°C).
Related Products
Need Belzona 5821 applied
on your asset?
Our Louisiana team supplies and applies it — with 24-hour support, no shutdown, no hot work.