GRP Profiles
Lightweight, corrosion-resistant GRP structural profiles engineered for long-term strength, safety, and ease of installation in harsh environments.
Engineered Composites supply a wide range of GRP structural profiles that offer a high-performance alternative to steel, aluminium, and timber across various construction and industrial sectors. Manufactured using pultruded fibreglass and advanced resin systems, GRP profiles are built to withstand corrosion, chemical exposure, electrical hazards, and fire.
Engineered for demanding applications, these profiles are available in I-beams, box sections, channels, angles, and custom shapes to suit both structural and architectural needs.
GRP Profiles
GRP Profile Products We Offer
Whether you need structural framing, anti-sparking infrastructure, or fire-safe components, our GRP profile systems deliver strength without the weight.
Our GRP structural profiles are precision-pultruded to deliver strength, dimensional accuracy, and long-term durability in all weather and industrial conditions.
Material: Glass-reinforced plastic (GRP)
Shapes Available: Box sections, I-beams, channels, angles, T-sections, flats
Tensile Strength: Up to 240 MPa
Flexural Strength: ~340 MPa
Modulus of Elasticity: 20,000–25,000 MPa
Fire Rating: ASTM E84 Class 2 (optional fire-retardant resin)
Thermal Performance: Operational from -40°C to +120°C
UV Resistance: Surface protected for outdoor use
Colours: Grey as standard; custom RAL available
Fixings: Pre-drilled or field-drilled; bolt-together installation
Finishes: Smooth, gritted or resin-enhanced depending on use
Profiles are available cut-to-length and ready for rapid site assembly or modular integration.
All GRP profiles are manufactured to meet structural, fire safety, and durability standards for use in regulated environments including transport, energy, marine, and healthcare.
BS EN 13706 – Specification for pultruded GRP profiles (Grade E23)
EN 13501-1 – Fire classification for building materials (Euroclass tested)
BS EN ISO 14122-2 – Access system safety and structural performance
BS 7976-2 – Slip resistance testing (for relevant profiles with walk-on surfaces)
ASTM E84 – Flame spread and smoke development certification
ISO 9001:2015 – Quality control in production, traceability, and materials testing
REACH / RoHS Compliant – Certified for environmental safety and sustainability
All profiles are tested for dimensional consistency, load-bearing strength, fire resistance, and chemical stability in line with UK and EU regulatory requirements.
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Technical Data Table
BSEN13706 Specification for GRP Profiles defines two grades of structural profiles. Our structural profiles with a wall thickness of over 5mm meet the higher performance E23 grade, while those at 3-5mm thick meet the E17 grade.
Please view our Technical Data Table below for further specifications.
| Units | Property Data | Property Data | |
|---|---|---|---|
| E 23 Grade | E 17 Grade | ||
| Full section modulus | GPa | 23 | 17 |
| Tensile strength (axial) | MPa | 240 | 170 |
| Tensile strength (transverse) | MPa | 50 | 30 |
| Tensile Modulus (axial) | GPa | 23 | 17 |
| Tensile Modulus (transverse) | GPa | 7 | 5 |
| Flexural strength (axial) | MPa | 240 | 170 |
| Flexural strength (transverse) | MPa | 100 | 70 |
| Inter-laminar shear | MPa | 25 | 15 |
| Pin bearing strength | MPa | 70 | 50 |
Additional Generic Physical Property Data
| Property | Units | typical value |
|---|---|---|
| Density | g/cm 3 | 1.9 |
| Barcol Hardness | 3 | 50 |
| Water Absorption | % | 1.0 max |
| Electrical Strength | kV/mm | 5-10 |
| Coeff. of thermal expansion | deg C x 10 -6 | 6-10 |
| Coeff. of thermal conductivity | W/m deg C | 0.3-0.35 |
Corrosion & Weather Resistant
No rust, rot, or degradation over time
Non-Conductive & Fire Retardant
Safe for electrical and industrial sites
Lightweight & High Strength
Easy to install with exceptional durability
Why Choose GRP Structural Profiles?
GRP profiles offer a smarter alternative to steel, timber, or aluminium in environments that demand strength without corrosion, conductivity, or heavy maintenance. Engineered for longevity, they deliver reliable structural support in even the most challenging conditions.
Lightweight & Strong
Easier to transport and install than steel
Corrosion-Resistant
No rusting in salt, moisture, or chemical environments
Fire-Retardant Options
Suitable for tunnels, transport, and aviation
Non-Conductive
Safe for electrical infrastructure and medical zones
Low Maintenance
No painting or coating required
Customisable
Wide range of profiles and RAL colours
Need Help Choosing the Right GRP Profiles? Talk to Our Experts!
We’ll help you choose the right solution based on safety, environment & compliance.
Typical Applications of GRP Structural Profiles
GRP structural profiles are widely used across industrial, commercial, and infrastructure sectors. Thanks to their high strength-to-weight ratio, corrosion resistance, and non-conductive properties, they’re ideal for both new constructions and retrofitting in safety-critical environments.
Rooftop Frames & Gantries
GRP box sections and channels are ideal for building non-load-bearing rooftop frameworks, walkways, and access gantries where weight limits and exposure to the elements are major concerns.
Blast Walls & Perimeter Barriers
Used in airports, energy plants, and military zones, GRP profiles form rigid, non-metallic blast walls and fencing systems that are weatherproof, spark-proof, and quick to install.
Cable Management Systems
GRP channels and trays are perfect for supporting electrical cabling in substations, tunnels, and industrial plants- offering safe, non-conductive routing without risk of corrosion.
Chemical & Water Treatment Facilities
Profiles maintain their integrity in harsh chemical and wet environments where steel would corrode, making them ideal for walkways, structural platforms, and tank supports.
Transport & Marine Infrastructure
GRP’s resistance to salt, moisture, and UV makes it suitable for coastal walkways, signal gantries, handrails, and access structures on rail and marine sites.
Modular Framing & Cladding Support
Profiles are used to create lightweight structural skeletons for modular buildings, ventilation towers, and maintenance structures with minimal fixings and fast on-site assembly.
Case Studies
Rooftop Helipad, Tres Cruces Hospital (Spain)
In a mission-critical healthcare project, Engineered Composites supplied GRP profiles for the construction of a rooftop helicopter landing pad at Tres Cruces Hospital. The lightweight GRP frame helped solve multiple design challenges:
Avoided overloading the existing hospital roof
Maintained full emergency A&E operations during installation
Delivered rapid installation with minimal onsite cutting
Provided long-term UV and moisture resistance for exposed rooftop use
This case proves GRP profiles are an optimal choice for structural builds where low weight, non-metallic properties, and fast installation are vital.
Copenhagen Airport Blast Wall
To meet strict safety and security standards, Copenhagen Airport required a non-metallic blast wall system capable of resisting both structural shock and coastal corrosion. GRP structural profiles were chosen for their:
Non-conductive and non-sparking properties, essential near sensitive aviation equipment
High strength-to-weight ratio, making it easier to install on-site without large machinery
Modular design, allowing fast assembly using bolted fixings with minimal disruption to operations
Corrosion resistance, ideal for long-term durability in exposed, salty environments
This project highlights how GRP profiles can outperform traditional materials in aviation, security, and marine-exposed infrastructure projects.
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FAQs About GRP Profiles
GRP (Glass Reinforced Plastic) profiles are used as structural framing, support beams, and load-bearing elements in sectors like construction, marine, rail, energy, and telecom. Common applications include walkways, rooftop frames, cable management, and non-metallic enclosures.
While GRP profiles may not match the raw tensile strength of steel, they offer a superior strength-to-weight ratio. This makes them easier to install and more durable in corrosive, wet, or electrically sensitive environments, all with minimal maintenance.
Yes. GRP profiles are UV-stabilised and weatherproof, making them ideal for long-term outdoor use. They resist moisture, salt spray, temperature fluctuations, and aggressive environmental conditions, including those found in marine or coastal areas.
Many GRP profiles are made with fire-retardant resin systems and are tested to standards like ASTM E84 Class 2 and EN 13501-1. These profiles are suitable for public infrastructure, transport hubs, and industrial environments where fire safety is critical.
Yes. GRP is naturally electrically non-conductive, making it the material of choice for use near live equipment, substations, rail networks, and medical facilities where electrical safety is essential.
Absolutely. GRP profiles can be cut to size, drilled, and finished with specific colours or surface textures. Custom shapes and resin formulations are also available for project-specific requirements, including chemical or fire resistance.
With proper installation, GRP profiles can last 25–50 years or more. They don’t rust, rot, or warp, and require virtually no maintenance, making them a highly cost-effective solution for long-term infrastructure projects.