PS500B Fire Retardant Polyurea Coating for Traffic Tunnels

Industry Challenge
Traffic tunnels and underground transportation structures operate in highly demanding environments where moisture ingress, corrosion, mechanical stress, and fire safety must all be addressed simultaneously.
Traditional waterproofing systems often provide only partial protection and may fail to meet stringent fire safety requirements.
PS500B is specifically developed to solve this challenge by combining the mechanical performance of polyurea with enhanced flame-retardant properties, delivering integrated protection for critical transportation infrastructure.
Product Description
PS500B is a 100% solids, spray-applied aromatic polyurea elastomer specially formulated for tunnel and transportation infrastructure applications.
It not only delivers the outstanding waterproofing, corrosion resistance, and mechanical durability expected from high-performance polyurea systems, but also features self-extinguishing behavior when removed from direct flame exposure.
The addition of flame-retardant technology significantly improves fire safety performance, making PS500B particularly suitable for enclosed infrastructure environments with strict safety requirements.
With rapid curing and seamless application, it enables efficient installation on curved, vertical, and complex structural surfaces.
Key Advantages
✔ Enhanced Fire Safety Performance
Unlike standard Polyurea Coatings, PS500B incorporates flame-retardant additives that improve fire resistance.
Benefits include:
1:Self-extinguishing performance
2:Improved tunnel fire safety compliance
3:Reduced flame propagation risk
This makes it ideal for enclosed public infrastructure.
✔ Integrated Waterproofing and Corrosion Protection
PS500B forms a dense seamless membrane that protects against:
1:Water ingress
2:Chloride penetration
3:Chemical corrosion
4:Freeze-thaw deterioration
✔ Excellent Flexibility for Structural Movement
1:Elongation: 450%
2:Shore A Hardness: 92
Allows the coating to accommodate substrate movement without cracking.
✔ Fast Application for Large Infrastructure Projects
Gel time: 4–6 seconds
Tack-free time: 15–40 seconds
Enables high-efficiency application across large tunnel surfaces.
✔ Long-Term Durability
Designed to reduce maintenance frequency and extend infrastructure service life.
Technical Performance
1:Tensile Strength:                  16 MPa
2:Elongation at Break:             450%
3:Tear Strength:                       62 kN/m
4:Abrasion Loss:                      4.6 mg
5:Adhesion to Concrete:          3 MPa
6:Adhesion to Steel:                11 MPa
7:Salt Spray Resistance:          2000 hours
8:Cathodic Disbondment:         ≤15 mm
These properties ensure reliable long-term performance in demanding transportation environments.
Typical Applications
PS500B is widely used for:
• Railway tunnels
• Highway tunnels
• Urban subway systems
• Underground traffic passages
• Transportation infrastructure waterproofing
• Fire-retardant protective linings for enclosed structures
Application Notes
• Mix ratio: 1:1 (by volume)
• Spray application using dedicated polyurea equipment is required
• Component B must be thoroughly agitated before application
• Surface preparation and Primer application are critical for optimal adhesion
• Trial spray testing is recommended before full-scale application
FAQ
1. What makes PS500B different from standard tunnel waterproof coatings?
PS500B combines waterproofing, anti-corrosion performance, and flame-retardant properties in a single seamless coating system, reducing the need for multiple protection layers.
2. Does the coating support tunnel fire safety requirements?
Yes. PS500B exhibits self-extinguishing behavior after flame removal and is specifically designed for applications where fire safety is critical.
3. Can it be applied on curved tunnel surfaces?
Yes. Its fast gel time allows application on curved, vertical, and overhead surfaces without sagging.
4. How does it perform under long-term moisture exposure?
It provides excellent impermeability and resists water penetration, making it highly effective for underground and high-humidity environments.
5. Is it suitable for both concrete and steel tunnel structures?
Yes. It demonstrates strong adhesion to both concrete and steel substrates when applied with proper surface preparation.
6. How does PS500B help reduce maintenance costs?
Its seamless structure, chemical resistance, and long-term durability significantly reduce repair frequency and lifecycle maintenance costs.