Seawater Desalination Caisson Special Coating
polyurea systems are resistant to seawater and saline fog, have an excellent adherence over metal and concrete and do not allow for the development or anchoring ofmicroorganisms or plants, making them the ideal interior and exterior coating of pipes, filters and deposits in desalination plants.
Product Overview
Advanced Polyurea Protection for Marine and Desalination Structures
HS800C is a 100% solids aromatic spray polyurea coating specially developed for seawater desalination caissons, marine structures and equipment exposed to highly corrosive seawater environments.
Seawater contains high concentrations of salts, chlorides and other corrosive substances that can accelerate steel corrosion and damage protective coating systems. HS800C forms a seamless and flexible protective membrane that effectively isolates substrates from seawater penetration, chemical attack and mechanical erosion.
With excellent corrosion resistance, abrasion resistance and cathodic disbonding resistance, HS800C provides long-term protection for desalination facilities, offshore structures and marine infrastructure.
Marine Corrosion Challenges
Marine and desalination equipment often operates under severe conditions, including:
- Continuous seawater exposure
- High chloride concentration
- Saltwater corrosion
- Wave impact and erosion
- Temperature fluctuations
- Long-term immersion conditions
Conventional coatings may suffer from cracking, peeling or loss of adhesion after prolonged exposure.
HS800C is designed to provide durable protection in aggressive marine environments.
How HS800C Protects Marine Structures
After application, HS800C rapidly cures into a dense elastomeric membrane with excellent adhesion to steel, concrete and other substrates.
The coating provides:
- Waterproof barrier protection
- Resistance against seawater corrosion
- Protection against erosion and abrasion
- High flexibility under structural movement
- Long-term coating integrity
Its seamless structure minimizes weak points and improves overall corrosion protection performance.
Key Performance Advantages
Excellent Seawater Corrosion Resistance
HS800C is specially formulated for marine environments and provides excellent resistance against:
- Saltwater corrosion
- Chloride penetration
- Chemical attack
- Marine aging
It helps protect critical equipment operating in seawater conditions.
Superior Cathodic Disbonding Resistance
The coating demonstrates excellent resistance to cathodic disbonding, helping maintain strong adhesion and coating stability in marine protection systems.
Seamless Waterproof Protection
The spray-applied polyurea membrane creates a continuous protective layer that prevents seawater infiltration and protects steel and concrete structures.
High Mechanical Durability
HS800C provides excellent:
- Impact resistance
- Abrasion resistance
- Flexibility
- Shock absorption performance
allowing it to withstand demanding marine operating conditions.
Application Areas
HS800C is suitable for corrosion and waterproof protection of:
- Seawater desalination caissons
- Desalination plant structures
- Offshore marine equipment
- Offshore platforms
- Port and wharf structures
- Marine steel structures
- Seawater intake facilities
- Coastal infrastructure
Technical Specifications
| Property | Typical Value |
|---|---|
| Product Type | 100% Solid Aromatic Spray Polyurea Elastomer |
| Solid Content | 100% |
| Mixing Ratio | 1:1 |
| Gel Time (25°C) | 4–6 Seconds |
| Tack-Free Time | 15–40 Seconds |
| Recommended Thickness | 1000–3000 μm |
| Hardness | Shore A 90 |
| Tensile Strength | 18 MPa |
| Elongation at Break | 460% |
| Tear Strength | 65 kN/m |
| Adhesion Strength (Concrete) | 3.2 MPa |
| Adhesion Strength (Steel) | 11.5 MPa |
| Impermeability | Excellent Waterproof Performance |
| Cathodic Disbonding Resistance | ≤15 mm |
Chemical Resistance Performance
HS800C provides reliable protection against common corrosive media in marine environments.
| Medium | Performance |
|---|---|
| Acid Resistance | Excellent resistance to acid exposure |
| Alkali Resistance | Excellent resistance to alkaline conditions |
| Salt Resistance | Excellent resistance to saltwater environment |
| Salt Spray Resistance | 2000 hours without coating failure |
| Oil Resistance | Suitable for diesel and crude oil exposure |
Application Guide
Recommended Application Method
HS800C should be applied using professional high-pressure two-component spray equipment.
Recommended equipment:
- GRACO H-XP3 Polyurea Spray Machine
- Fusion Air Purge Spray Gun
- Mechanical Purge Spray Gun
Application Conditions
| Parameter | Requirement |
|---|---|
| Ambient Temperature | 0–45°C |
| Relative Humidity | ≤90% |
| Material Temperature | 65–70°C |
| Hose Temperature | 55–65°C |
| Spray Pressure | 2000–2500 psi |
Surface Preparation and Application Process
For maximum coating performance:
1. Substrate Preparation
Remove rust, dust, oil and contaminants from the surface.
2. Primer Application
Apply suitable primer to improve adhesion between coating and substrate.
3. Polyurea Spraying
Apply HS800C using professional spray equipment to achieve uniform coating thickness.
4. Quality Inspection
Check coating thickness, adhesion and surface condition before commissioning.
Why Choose HS800C Marine Polyurea Coating?
Compared with traditional marine protective coatings, HS800C offers:
- 100% solids formulation
- Zero VOC emissions
- Excellent seawater corrosion resistance
- Strong adhesion to marine substrates
- Superior waterproof performance
- High abrasion resistance
- Fast curing speed
- Long service life
HS800C provides a reliable corrosion protection solution for seawater desalination systems and marine infrastructure exposed to harsh saltwater environments.
Frequently Asked Questions
1. What is HS800C used for?
HS800C is designed for seawater desalination caissons, marine equipment and offshore structures requiring long-term corrosion protection.
2. Why use polyurea coating in marine environments?
Polyurea provides seamless waterproofing, excellent flexibility, chemical resistance and durability, making it suitable for harsh seawater conditions.
3. Can HS800C withstand continuous seawater exposure?
Yes. HS800C is specifically developed for marine environments and provides excellent resistance to seawater corrosion and erosion.
4. What substrates can HS800C protect?
HS800C can bond strongly to properly prepared steel, concrete and other engineering substrates.
5. Does HS800C require special spray equipment?
Yes. Professional high-pressure two-component polyurea spray equipment is required to ensure proper mixing and coating quality.
Packaging and Storage
Packaging
- Component A: 220 kg / 200L drum
- Component B: 210 kg / 200L drum
Storage
Store in a cool and dry place at 5–35°C. Avoid direct sunlight.
Shelf Life
9 months under recommended storage conditions.
