Belzona 5831
ST-Barrier
A moisture-tolerant epoxy coating for corrosion protection of wet and oil contaminated surfaces.
A 2-part epoxy coating formulated for application to wet, oil-contaminated, and underwater surfaces, displacing water from the substrate to ensure maximum adhesion. Once cured, it forms a barrier coating for protection of equipment operating under immersed conditions or in contact with aqueous solutions.
- SeriesBelzona 5000 Series
- Documents3
Overview of Belzona 5831
A 2-part epoxy coating formulated for application to wet, oil-contaminated, and underwater surfaces, displacing water from the substrate to ensure maximum adhesion. Once cured, it forms a barrier coating for protection of equipment operating under immersed conditions or in contact with aqueous solutions.
Key Benefits
Bonds tenaciously even when surface preparation is minimal or substrate is contaminated
No solvents, no shrinkage during cure
Cures at room temperature without hot work
Bonds strongly to virtually any rigid surface
Application Areas
What this product handles, grouped by equipment area — each links to the full application.
Electrical & Power Generation Equipment
3 applications- Turbines, generators coatingsPower generation equipment, from turbine casings to generator end shields, takes a continuous corrosion load from coolant leaks, lubricant migration, and plant-air humid…Learn more
- Electrical structure coatingSteel solar racking and ground-mount foundations corrode at the soil-air interface and around bolted connections, where galvanic interactions between dissimilar metals a…Learn more
- Power generation equipmentStandby generator enclosures, baseplate skids, and breaker compartments take weather and condensation continuously, and waterproofing failures show up as corroded mounti…Learn more
Ships & Maritime Structures
2 applicationsPipelines
1 applicationValves, Pipes & Fittings
1 applicationTechnical Data
Performance Characteristics
- Cures underwater and on damp/oily substrates by displacing surface contaminants
- Bonds tenaciously to steel, stainless steel, copper, brass, concrete, and brick
- Outstanding corrosion protection in immersion service and splash zones
- Excellent chemical resistance to a wide range of chemicals — refer to the Chemical Resistance Chart
- Refer to the attached Product Specification Sheet for full mechanical and adhesion data
Working Life
- At 25°C (77°F)
- Approximately 1 hour from the start of mixing
Curing Time
At 25°C (77°F)
- Touch dry
- 6 hours
- Hard cure / overcoat window opens
- 16 hours
- Maximum overcoat interval
- 48 hours
- Full chemical / immersion service
- 7 days
At lower temperatures
- Curing times increase as the substrate temperature drops; refer to the IFU for tables
Service Temperature Limits
- Application substrate temperature range
- 25°C to 40°C (77°F to 104°F)
- Continuous service temperature (immersion)
- Up to 50°C (122°F)
- Lower service temperature limit
- -40°C (-40°F)
Mixing & Application
Product PDFs
Gallery
Videos
Frequently Asked Questions
What is the mixing ratio of Belzona 5831 (ST-Barrier)?
The mixing ratio of Belzona 5831 (ST-Barrier) is 1.75 parts Base to 1 part Solidifier by weight, or 1 part Base to 1 part Solidifier by volume. Refer to the Product Specification Sheet (PSS) for full details.
Can Belzona 5831 be applied underwater?
Yes. Belzona 5831 (ST-Barrier) is specifically formulated for application to wet, oily, and underwater surfaces. The coating displaces water from the substrate to ensure maximum adhesion, and once cured forms a barrier coating for long-term protection of equipment in immersed conditions.
What are typical applications for Belzona 5831?
Typical applications include corrosion protection in splash zones, on pipework, tanks, bunds and clarifiers; protection of submersible pumps, valves, and transformers from galvanic corrosion; long-term sealing of oil and water leaks; and sealing of joints and flanges.
Related Products
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