GRP Frangible Mesh Fencing
The Engineered Composites GRP Frangible Mesh Fencing system is a Glass Fibre Reinforced Polymer perimeter solution designed specifically for airside use. GRP mesh panels, structural columns, and proprietary connection hardware deliver security performance comparable to steel while remaining fully radio-transparent across the 100 MHz to 1 GHz aviation frequency range.
Radio transparency is a regulatory requirement for fencing installed near ILS, ASR, VOR, and DME systems. Steel reflects radar signals, causes ILS beam bending, and must be charted as an obstacle. GRP eliminates all of these issues by being electromagnetically invisible.
Frangibility compliance to ICAO Annex 14 and Airport Design Manual Part 6 is confirmed by independent SGS dynamic impact testing, qualified at less than 45 kN force and less than 55 kJ energy at failure.
What Makes This System Frangible
SGS-Tested and ICAO Qualified
Independently tested by SGS using 30 kg and 55 kg impactors at four drop heights. Passed all 8 test scenarios, confirming full ICAO Annex 14 qualification at less than 45 kN and less than 55 kJ.
Radio-Transparent to 0.5 dB
Tested to IEEE Std 299 in a semi-anechoic chamber at Southeast University, Nanjing. Maximum signal attenuation of 0.5 dB across 100 MHz to 1 GHz. No RF modelling required.
Pre-Fabricated, Fast Installation
All-GRP components handled by a standard two-person team. No crane, no welding, and no specialist lifting equipment required. Lower mesh sections can be buried for wildlife exclusion.
Technical Specifications
| Parameter | Specification |
|---|---|
| Mesh rebar diameter | 3.3 mm |
| Mesh aperture | 33 x 33 mm |
| Standard height | 2 m (range: 1 m to 2.5 m) |
| Maximum sheet width | 2.2 m |
| Available lengths | 3 m, 6 m, 9 m |
| Column profile | Round tube Ø50×5 or 50×50 SHS |
| Column height | 1 m to 3 m (customisable) |
| Post spacing | 2,000 mm standard |
| Operating wind load (ULS) | 1.5 kN/m2 |
| ICAO impact force limit | Less than 45 kN |
| ICAO energy at failure limit | Less than 55 kJ |
| Radio attenuation | 0.5 dB (100 MHz to 1 GHz) |
| CTF incident grade (I/F) | 78 Tonnes minimum post equivalent |
| Corrosion wing limit | 1.8 kN x 4.8 kN to 6 kN |
Need GRP Frangible Fencing for Your Project?
Speak to our technical team for system configuration, compliance documentation, and project sizing. Custom heights, post spacings, and zone configurations are available on request.
Radar Transparency Tested and Verified
Steel fencing reflects radar signals, causes ILS beam bending, and must be charted as a radar obstacle. GRP eliminates all of these issues by being electromagnetically invisible across all aviation frequency bands.
The system was tested to IEEE Std 299 and GB/T12190-2021 in a semi-anechoic chamber at Southeast University, Nanjing, with SGS supervising throughout. Maximum signal attenuation of 0.5 dB across the full 100 MHz to 1 GHz range.
The system can be installed adjacent to ILS critical areas, ASR clear zones, VOR protection areas, and DME sites without electromagnetic interaction, removing the need for RF modelling or radar-absorbing treatments.
- Tested to IEEE Std 299 and GB/T12190-2021
- Semi-anechoic chamber, Southeast University, Nanjing. SGS approved
- Suitable for ILS, ASR, VOR, and DME protection zones
System Components
| Component | Description |
|---|---|
| GRP Mesh Panel | 3.3 mm rebar, 33 x 33 mm aperture, max width 2.2 m, lengths 3, 6, and 9 m |
| GRP Column (Round) | Ø50 x 5 mm round tube, height 1 m to 3 m customisable |
| GRP Column (Square) | 50 x 50 mm SHS, height 1 m to 3 m customisable |
| Zone A End Post | Column with two diagonal braces for outward-facing terminations and external corners |
| Zone B End Post | Column with single diagonal brace for inward-facing terminations and straight runs |
| Zone C Intermediate | Vertical column at intermediate positions, 2,000 mm centres, for internal corners |
| Connecting Plates | GRP plates (A1 to A6, B1 to B6, C1 to C4) and pop rivets for bracing joints |
| Horizontal Tension Rebar | Ø12 x 2 aluminium crimp tubes, fixed with hydraulic pliers |
| Base System | C-shaped concrete base channel with metal connectors and drill-tail screws |
Simple Installation. No Specialist Equipment.
Compliance and Testing
| Standard / Accreditation | Scope | Status |
|---|---|---|
| ICAO Annex 14 / ADM Part 6 | Frangibility qualification for airside structures. Full-scale SGS drop-weight impact test using 30 kg and 55 kg impactors at 0.5, 1.0, 1.5, and 2.0 m drop heights. | Qualified |
| IEEE Std 299 / GB/T12190-2021 | Radio transparency. Semi-anechoic chamber test across 100 MHz to 1 GHz, SGS approved at Southeast University, Nanjing. Result: 0.5 dB attenuation. | Pass |
| Corrosion Resistance | Salt spray, UV, and chemical immersion per GRP composite material standards. Inherent to the GRP material with no treatment required. | Pass |
| ISO 9001:2015 | Quality Management System certified for design and manufacture of GRP composite products. | Certified |
| JOSCAR | Accredited supplier for the defence and aerospace supply chain. | Accredited |
Where It Is Used
The GRP Frangible Mesh Fencing system is designed for any airside application where both perimeter security and aviation safety compliance must be satisfied together.
Runway Perimeters (ICAO Frangibility Zone)
ICAO-qualified frangible perimeter fencing within 60 m of the runway centreline and approach line.
ILS, VOR and DME Protection Zones
Radio-transparent to 0.5 dB with no electromagnetic interaction with navigation and approach systems.
Airport Surveillance Radar Clear Zones
Electromagnetically invisible throughout, with no radar reflection, no false returns, and no charting required.
General Airside Perimeter
Corrosion-free and maintenance-free for taxiway, apron, cargo, and maintenance facility boundaries.
Military Airfields & Defence Installations
Non-magnetic and EM transparent for sensitive and high-security airside perimeter applications.
Radar & Communications Sites
Radio-transparent perimeter structure across all aviation and communications frequency bands.
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FAQs About GRP Frangible Mesh Fencing
GRP frangible mesh fencing is a perimeter security system manufactured from Glass Reinforced Plastic that is designed to break away safely on aircraft impact. ICAO Annex 14 requires any structure within 60 metres of the runway centreline to be frangible. For structures taller than 1.2 metres, compliance must be verified through full-scale dynamic impact testing. This system has been independently qualified by SGS across all 8 test scenarios.
Steel fencing reflects radar signals, creates false returns, and causes ILS beam bending that can compromise instrument approach accuracy. Any metal structure near radar or navigation equipment must be charted as an obstacle and may require costly RF modelling. GRP is electromagnetically invisible across all aviation frequency bands, removing all of these requirements.
The system was tested to IEEE Std 299 and GB/T12190-2021 in a semi-anechoic chamber at Southeast University, Nanjing, with SGS present throughout. Across the full 100 MHz to 1 GHz range, the system achieved a maximum signal attenuation of 0.5 dB, confirming invisibility to all aviation surveillance and navigation systems.
The system was subjected to a full-scale SGS drop-weight impact programme using 30 kg and 55 kg impactors at 0.5 m, 1.0 m, 1.5 m, and 2.0 m. The system fractured correctly at all 8 test points, qualifying at less than 45 kN force and less than 55 kJ energy at the most demanding test condition.
Columns fix to a concrete base channel at 2,000 mm centres using anchor fixings. Mesh panels are secured using cable ties and aluminium crimp-tube tension rebars tightened with hydraulic pliers. No crane, no welding, and no specialist lifting equipment is required. A standard two-person team can install the system throughout.