Fiberglass Pultruded Bar Grating Overview
Fiberglass Pultruded Bar Grating is a structural FRP grid panel made by the pultrusion process. It is used for industrial walkways, platforms, and access areas where high load capacity and corrosion resistance are required. The continuous glass fiber reinforcement gives the bars higher stiffness and span capability compared to molded grating. The material does not rust and is non-conductive.
Product Definition
Fiberglass Pultruded Bar Grating is a load-bearing grid panel composed of pultruded FRP bars arranged in a regular pattern and joined to form a rigid deck. It is designed to support pedestrian and light vehicle traffic in industrial and marine environments where metal grating may corrode or create electrical hazards.
Key Product Facts
- Material: glass fiber reinforced polymer (FRP / GRP)
- Manufacturing process: pultrusion
- Bar profile: I-bar or T-bar
- Typical panel depths: 25 mm, 30 mm, 38 mm, 50 mm
- Surface options: gritted, meniscus, or smooth
Material & Construction
Fiberglass Pultruded Bar Grating is manufactured by the pultrusion process, in which continuous glass fiber rovings are pulled through a resin bath and then through a heated die to form straight, high-strength structural bars. These bars are then assembled into panels with cross bars using mechanical fasteners or adhesive bonding.
The continuous fiber orientation gives the bars higher longitudinal stiffness and span capability than molded grating. The resin matrix protects the fibers and provides resistance to moisture, chemicals, and UV exposure. Standard resin options include polyester, vinyl ester, and flame-retardant formulations.
Applications
FRP pultruded gratings are commonly used in industrial environments where longer spans and higher loads are required, and where corrosion or electrical safety is a concern. Typical installations include chemical processing plants, offshore platforms, power generation facilities, water and wastewater treatment plants, and marine structures.
The grating is often specified for walkways, catwalks, trench covers, mezzanine decks, and maintenance platforms that must resist moisture, salt spray, or chemical exposure.
Selection Considerations
When specifying pultruded bar grating, the following factors typically influence design and performance:
- Span and load: The depth and spacing of the bearing bars must be selected according to the required span and live load. Longer spans generally require deeper bars or closer bar spacing.
- Resin type: Resin selection affects corrosion resistance, fire performance, and UV stability. Options include polyester, vinyl ester, and halogen-free flame-retardant systems.
- Surface finish: Gritted or meniscus surfaces provide slip resistance in wet or oily conditions. Smooth surfaces may be preferred for easier cleaning.
- Electrical properties: The material is non-conductive, which can be an advantage in electrical substations or around energized equipment.
- Field modifications: Panels can be cut on site with standard FRP cutting tools, but cutting or drilling alters the factory-sealed edges. Exposed glass fibers must be re-sealed with a compatible resin topcoat to maintain corrosion resistance.
Technical Specifications
| Property | Standard Options / Values |
|---|---|
| Material | Fiberglass reinforced polymer (FRP / GRP) |
| Manufacturing process | Pultrusion |
| Bar profile | I-bar, T-bar |
| Typical depths | 25 mm, 30 mm, 38 mm, 50 mm |
| Panel sizes | Common 1220 × 3660 mm, 1000 × 4000 mm, custom sizes available |
| Resin options | Isophthalic polyester, vinyl ester, flame-retardant formulations |
| Surface options | Gritted, meniscus, smooth |
| Color options | Gray, green, yellow, custom colors may be available |
Actual load capacity, span capability, and chemical resistance are configuration dependent and must be verified by engineering calculations for each project.
Frequently Asked Questions
How does pultruded grating differ from molded grating?
Pultruded grating is made from continuous glass fibers pulled through a die, giving higher stiffness and span capability in one direction. Molded grating has fibers oriented in multiple directions, providing more balanced strength but generally lower span limits for the same depth.
Can pultruded grating be used in corrosive environments?
Yes. The resin system and glass fibers are resistant to many acids, alkalis, solvents, and saltwater. The specific resin should be selected based on the chemicals present in the operating environment.
Is the material electrically conductive?
No. FRP grating is non-conductive, which can reduce electrical hazards in substations or around high-voltage equipment. Suitable hardware and grounding practices should still be evaluated for the overall installation.
Can panels be cut or drilled on site?
Yes, standard cutting tools can be used. However, field cutting removes the factory-sealed edge. Exposed glass fibers must be re-sealed with a compatible resin topcoat to maintain corrosion resistance and prevent moisture ingress.
What is the expected service life?
Service life depends on load frequency, chemical exposure, UV exposure, and resin type. In many industrial applications, pultruded FRP grating requires less maintenance than steel and can offer a long operational life, but site-specific evaluation is recommended.
Related Products & System Components
Fiberglass Pultruded Bar Grating is typically installed as part of a complete access or flooring system. Common related components include:
- FRP support beams and structural framing for grating mounting
- Handrails and guardrail systems for elevated platforms
- Fastening hardware, hold-down clips, and connection accessories
For compatible products and system-level recommendations, contact our engineering team with your project requirements. You may also review our Pultruded FRP Grating selection guide or the FRP Grating Systems overview for related product families.
Engineering Inquiry
For technical data requests, load calculations, or project-specific drawings, please submit a request. Providing the following information helps our team prepare a more relevant response:
- Required panel dimensions and bearing bar depth
- Span length and support spacing
- Expected live loads and type of traffic
- Chemical exposure and ambient temperature range
- Surface finish preference (gritted, meniscus, or smooth)
- Fire performance or electrical non-conductivity needs
- Color preference and quantity required