35mm Promat PROMATECT L500 Calcium Silicate Board

The 35mm Promat PROMATECT L500 Fire Protection Board is a specialist A1 non-combustible calcium silicate board developed for advanced passive fire protection applications. Designed for use in commercial, industrial and residential construction projects, it provides reliable fire resistance and thermal insulation for protecting essential building services and creating fire-rated structures.

PROMATECT L500 35mm is widely used for the construction of fire-resistant ductwork, ventilation systems, cable protection enclosures, service shafts and mechanical service compartments. Its low-density calcium silicate composition delivers excellent fire performance while maintaining a lightweight format that allows easier handling and installation on site.

Specification

1. Brand: Promat
2. Model: PROMATECT® L500
3. Thickness: 35mm
4. Width: 1200mm
5. Length: 2500mm
6. Board Coverage: 3.00m²
7. Density: 500kg/m³
8. Compressive Strength: 5.5N/mm²
9. Thermal Conductivity: 0.09W/mK
10. Fire Classification: A1 (Non-combustible)
11. Fire Resistance: 30–240 Minutes
12. Construction Material Classification: EN 13501-1 Class A1
13. Surface Finish: One smooth face, one lightly textured face
14. Water Vapour Diffusion Resistance Factor: μ = 3.2
15. Bending Strength Longitudinal: 3 N/mm²
16. Tensile Strength Longitudinal: 1.2 N/mm²
17. Compressive Strength Perpendicular To Board Surface: 5.5 N/mm²

The board features a smooth sanded surface on one side and a lightly textured reverse face, providing flexibility for different installation requirements. Its robust structure allows it to be used in self-supporting fire protection systems where durability, stability and long-term performance are essential.

With tested fire resistance performance of 30 to 240 minutes, the 35mm PROMATECT L500 board helps maintain the integrity of fire-rated constructions during exposure to high temperatures. Its low thermal conductivity also enhances insulation performance, helping to protect surrounding materials and building components.

PROMATECT L500 is suitable for environments where moisture resistance is required. The board remains dimensionally stable during normal service conditions and is not adversely affected by ageing. If exposed to moisture, untreated surfaces may temporarily absorb water; however, the board recovers its original properties once dried.

The calcium silicate composition provides additional durability benefits, including resistance to mould growth, insect attack and vermin. The chemically stable formulation also offers resistance to dilute acids and alkalis, making it suitable for demanding commercial and industrial applications.

Applications

• Fire-resistant ductwork systems
• HVAC ventilation duct protection
• Sheet metal duct encasement
• Fire-rated cable protection systems
• Electrical cable enclosures
• Service risers and service shafts
• Mechanical service protection
• Fire compartmentation systems
• Passive fire protection applications
• Commercial and industrial fire protection projects

Key Benefits

• Provides tested fire resistance performance from 30 to 240 minutes depending on the system application.
• Classified as an A1 non-combustible calcium silicate board in accordance with EN 13501-1.
• Suitable for creating self-supporting fire-rated ductwork and enclosure systems.
• Combines excellent fire insulation with low thermal conductivity for improved protection.
• Resistant to moisture and suitable for areas exposed to humidity or occasional damp conditions.
• Helps prevent mould growth and provides resistance against insects and vermin.
• Chemically stable with resistance to dilute acids and alkalis.
• Lightweight construction allows easier cutting, handling and installation.
• Provides long-term durability and reliable performance in demanding environments.
• Ideal for passive fire protection in commercial buildings, industrial facilities, public buildings and specialist construction projects.