Product Description
FRP (fiber reinforced plastic) purlins are structural components manufactured through pultrusion, a process that combines continuous fiberglass reinforcement with thermoset polyester or vinyl ester resin. These purlins are used as secondary framing for roofing and wall systems in commercial and industrial buildings where corrosion resistance, light weight, or electrical insulation is important. IncomePultrusion produces purlins and other structural profiles on controlled pultrusion machines with matched steel pultrusion dies. For more structural shapes, see our pultruded FRP profiles.
Technical Specifications
Material Properties
- Composition: Fiberglass reinforcement + thermoset polyester/vinyl ester resin
- Density: 1.8-2.0 g/cm^3 (significantly lighter than steel for equal cross-section)
- Tensile Strength: Up to 290 MPa
- Flexural Strength: 240-280 MPa
- Elastic Modulus: 25-30 GPa
- Thermal Conductivity: 0.3-0.5 W/mK (lower than steel)
- Electrical Resistivity: >10^10 ohm m (non-conductive)
Dimensional Options
- Standard Profiles: C-Channel, I-Beam, Z-Purlin, Rectangular Tube
- Standard Lengths: 6m, 9m, 12m
- C-Channel Dimensions:
- Height: 100mm, 150mm, 200mm, 250mm
- Width: 50mm, 75mm, 100mm
- Thickness: 5mm, 6mm, 8mm
- Custom Dimensions: Available upon request
Performance Ratings
- Temperature Resistance: -40 degree C to +80 degree C continuous operation
- Fire Rating: Fire-retardant formulations available with ASTM E84 flame spread rating of 25 or less
- UV Protection: Enhanced formulations available for outdoor exposure
- Warranty: Warranty terms available upon request
Applications & Use Cases
Building Construction
- Roof purlin systems for metal roof panels
- Wall girt systems for exterior cladding and insulation
- Pre-engineered building framing
Industrial Environments
- Chemical processing plants
- Water treatment facilities
- Cooling towers
- Manufacturing facilities
Specialized Applications
- Coastal structures exposed to salt spray
- Agricultural buildings
- Food processing facilities
- Cold storage facilities where reduced thermal bridging is desired
Key Advantages
Durability
- Corrosion Resistance: FRP purlins resist environments that deteriorate unprotected steel
- Low Maintenance: No painting or rust-prevention coatings required for many service conditions
- Weather Resistance: Resists rain, snow, UV exposure, and temperature fluctuations when properly formulated
- Chemical Resistance: Resists attack from many acids, bases, salts, and organic solvents
- Dimensional Stability: Does not warp, twist, or shrink like wood alternatives
Economic Benefits
- Installation Efficiency: Lightweight profiles can be handled with less equipment and fewer workers
- Reduced Labor Costs: Can often be installed without heavy lifting equipment
- Transportation Savings: Lower weight can reduce shipping costs
- Lower Maintenance Costs: Eliminates ongoing painting and rust prevention expenses in corrosive environments
- Extended Service Life: Can outlast unprotected steel in corrosive environments
Performance Advantages
- Lightweight Structure: Significantly lighter than steel for equal cross-section, reducing overall building load
- Thermal Efficiency: Non-conductive nature reduces thermal bridging
- Energy Performance: Can improve building envelope performance compared with thermally conductive steel
- Electrical Safety: Non-conductive; grounding is not required for basic electrical isolation
- Low Thermal Expansion: Minimal movement with temperature changes compared with metals
Comparative Analysis
FRP vs. Steel vs. Wood Purlins
| Feature | FRP Purlins | Steel Purlins | Wood Purlins |
|---|---|---|---|
| Weight | Light | Heavy | Medium |
| Initial Cost | Project-specific | Project-specific | Project-specific |
| Lifetime Cost in Corrosive Environments | Often lower due to reduced maintenance | Higher due to coatings and repairs | Moderate |
| Corrosion Resistance | Excellent | Poor without protection | Moderate |
| Maintenance Needs | Low | High in corrosive environments | Medium |
| Fire Resistance | Fire-retardant options available | Good | Poor |
| Electrical Conductivity | Non-conductive | Conductive | Low |
| Installation Ease | Easy (lightweight) | Difficult (heavy) | Moderate |
| Environmental Impact | Lower lifetime impact in corrosive service | Higher due to coatings and replacement | Moderate |
| Expected Lifespan | Can exceed steel life in corrosive environments | 15-30 years depending on protection | 10-25 years depending on treatment |
Lifespan and cost figures are representative; actual values depend on environment, specification, and maintenance.
Frequently Asked Questions
How do FRP purlins handle heavy snow loads?
FRP purlins can be engineered to support snow loads when sized with the correct safety factor and span. We provide load tables based on profile size and support spacing for your region’s snow load requirements.
Can FRP purlins be used in fire-sensitive applications?
Fire-retardant formulations are available that can achieve ASTM E84 flame spread ratings of 25 or less. For stringent fire requirements, request advanced formulations and supporting test data.
How are FRP purlins connected to primary structural members?
FRP purlins can be connected with bolts, self-tapping screws, and FRP-compatible connectors. We provide connection guidelines and can design custom connection solutions for your building requirements.
What is the carbon footprint of FRP purlins compared to steel?
The lifecycle environmental impact of FRP purlins depends on resin source, service life, and end-of-life handling. Their light weight can reduce transportation emissions, and long service life in corrosive environments can reduce replacement-related impacts.
Do FRP purlins meet international building codes?
FRP structural components are referenced in ASTM standards and design guides. We provide technical documentation and can assist with engineering certifications for your jurisdiction.
How do extreme temperatures affect FRP purlins?
FRP purlins maintain structural properties across the rated service temperature range. They exhibit lower thermal expansion than metals, which can reduce stress on connections and fasteners.
For concrete reinforcement options, see our FRP rebar range.
Bulk Fiber Reinforced Plastic Purlins
Need fiber reinforced plastic purlins for a roof, wall, or industrial framing project? Contact us for a quote and we will confirm profiles, load data, lead time, and delivery.
Ready to specify FRP purlins for your project? Contact our technical sales team for engineering support, detailed specifications, and project-specific recommendations.
