The FirePro Plus PU28 4 Hour Fire Barrier is a high-performance, stainless steel wire-reinforced glass fabric coated with a specially formulated intumescent, fire-retardant silicone elastomer. Designed for demanding smoke and fire control applications, this flexible yet durable barrier delivers up to 240 minutes of fire protection while maintaining excellent resistance to heat, wear, and environmental conditions.
When exposed to temperatures above 140°C, the coating forms an expanding intumescent char, creating a thermally insulating layer that helps to contain smoke and flames. Even at extreme temperatures up to 1100°C, the stainless steel wire reinforcement maintains physical integrity.
PU28 4 Hour is non-toxic, halogen-free, and resistant to hydrolysis, making it suitable for critical fire safety systems in both commercial and industrial environments.
Key Features & Benefits
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4-hour fire resistance – Class ‘0’ rated, tested to BS 476 Parts 6 & 7
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Stainless steel wire-reinforced glass fabric for exceptional durability
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Silicone and intumescent graphite coating on both sides
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Withstands temperatures up to 1100°C (maintains structure)
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Non-toxic and halogen-free – no harmful smoke emissions
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Good resistance to hydrolysis and environmental degradation
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Flexible and lightweight for ease of handling and installation
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Complies with IMO MSC 307(88) – Smoke/Toxicity & Flammability standards
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Suitable for both permanent and removable fire safety systems
Technical Specifications
| Property | Value |
|---|---|
| Fire Resistance | 240 minutes |
| Fire Rating | Class ‘0’ (BS 476 Parts 6 & 7) |
| Roll Size | 1.2m x 50m |
| Area Weight | 1750 g/m² |
| Base Fabric Weight | 640 g/m² |
| Thickness (Nominal) | 1.50 mm |
| Tensile Strength (Min) | Warp: 650 N/5cm / Weft: 600 N/5cm |
| Coating | Silicone + Intumescent Graphite (both sides) |
| Temperature Stability | -50°C to 140°C (exfoliates above 140°C) |
| Max Structural Integrity | Up to 1100°C |
| Toxicity | None – halogen-free |
Applications
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Smoke and fire curtains
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Cavity wall fire barriers
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Fire and smoke blinds
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Removable insulation covers
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Industrial and commercial smoke/fire control systems
Installation Guidance
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Can be cut, handled, and fitted using standard installation tools
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Maintain continuous coverage with overlaps for complete fire barrier integrity
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Fix using mechanical fastenings or as specified for system type
Important Notes
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Designed to contain smoke and flames only – not a thermal insulator
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Confirm suitability with Building Control or Fire Officer prior to use
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End user is responsible for ensuring correct application