Pultruded FRP Grating — Engineered for High Loads
When a project calls for composite grating that must span further and carry more than standard molded panels allow, pultruded FRP grating is the answer. GoGrating supplies pultruded fiberglass grating factory-direct from Anping, Hebei — the same fabrication base that produces our steel grating lines — with every order produced to the buyer's span, load, and resin specification rather than pulled from a stock shelf.
Because the glass reinforcement in pultruded grating runs continuously along the length of each load bar, the panel behaves much like a series of small structural beams. That directional design gives pultruded grating the highest strength-to-weight ratio in the FRP family, which is why EPC contractors and procurement engineers specify it for heavy-duty platforms, long-span walkways, and trench covers in corrosive plants where steel would require constant maintenance.
What is Pultruded FRP Grating?
Pultrusion is a continuous manufacturing process: bundles of glass rovings and surface mats are pulled through a resin bath, then drawn through a heated steel die that cures the composite into a constant-profile load bar — typically an I-bar or T-bar shape. These bars are then assembled into grating panels with cross rods locking them at fixed spacing. The result is a load bar with roughly 60–70% glass content by weight, far higher than molded grating can achieve.
The key difference from molded FRP grating is directionality. Molded grating is woven in two directions and offers bidirectional strength, which suits general walkways with closely spaced supports. Pultruded grating concentrates its reinforcement in one direction, so it carries significantly higher loads across longer unsupported spans — but it must be installed with the load bars running across the supports, just like steel bar grating.
Resin selection determines chemical and fire performance. We produce pultruded grating in orthophthalic resin for general service, isophthalic for improved chemical resistance, and vinyl ester for aggressive chemical and marine exposure. Fire-retardant formulations and UV-inhibited surface veils are available to suit project specifications.
Pultruded FRP Specifications
Pultruded grating is a custom-ordered product, so specifications are driven by your project documents rather than a fixed catalog. Typical load bar depths run from 25 mm to 63 mm (1" to 2-1/2"), with bar spacing configured to give roughly 30–60% open area depending on the balance you need between drainage, light passage, and surface coverage. Walking surfaces can be supplied gritted for slip resistance, smooth, or as covered plate grating where spill containment or rolling loads are involved.
As a rule of thumb, a pultruded panel of comparable depth will outperform molded grating on span and deflection — but we deliberately do not publish generic load numbers, because safe working loads depend on bar profile, resin, support conditions, and the applicable safety factor. Our production follows an ISO 9001 quality system, and engineered load and deflection tables for your specific configuration are provided during quotation. Send us your drawings or load requirements and our engineers will confirm the right bar depth and spacing.
Pultruded FRP Applications
Pultruded grating earns its place wherever loads are heavy, supports are far apart, or the environment attacks steel. Common uses include heavy-load industrial platforms and mezzanines in chemical and fertilizer plants, long-span walkways and crossovers in water and wastewater treatment works, stair treads with integrated gritted nosings, cooling tower decks, and dock or marina decking exposed to constant salt spray. Its non-conductive, non-sparking nature also makes it a standard choice around electrical substations and oil and gas facilities.
Many of our buyers in the Middle East, Southeast Asia, Europe, and the United States combine pultruded FRP with hot-dip galvanized steel grating on the same project — steel where cost-per-load governs, FRP where corrosion, weight, or electrical safety governs. Browse our applications guide to see how other EPC contractors and distributors have specified each material, or contact us with your bill of quantities for a combined offer covering both grating lines.
| Manufacturing process | Pultrusion — continuous rovings, resin bath, heated die |
| Load bar profiles | I-bar, T-bar, rectangular tube |
| Bar depth range | 25–63 mm (1" to 2-1/2"), to project spec |
| Open area | Approx. 30–60% depending on bar spacing |
| Glass content (load bars) | Approx. 60–70% by weight |
| Resin systems | Orthophthalic, isophthalic, vinyl ester |
| Walking surface | Gritted, smooth, or covered plate |
| Panel dimensions | Made to order; cut-to-size fabrication available |
| Colors | Yellow, gray, green, dark gray; custom on request |
| Quality system | ISO 9001; engineered load tables on request |
- Continuous glass rovings for maximum strength along the span
- Longer unsupported spans than molded FRP grating
- Resin options: orthophthalic, isophthalic, vinyl ester
- Non-conductive, non-sparking, corrosion resistant
- Gritted, smooth, or covered walking surfaces
- Panels cut and fabricated to project drawings
Frequently Asked Questions
Can pultruded FRP grating be fabricated to my project drawings?
Yes. Every order is produced to specification — bar depth, spacing, resin system, surface type, panel dimensions, cutouts, and color. Send CAD files, PDF drawings, or a simple sketch with your request for quote and our engineers will confirm a fabrication plan before production.
Is there a minimum order quantity for pultruded FRP grating?
MOQ depends on the bar profile, resin, and color you specify, since pultrusion runs are continuous. Standard profiles in common colors carry low minimums; fully custom profiles may require a larger run. Tell us your required quantity and we will confirm feasibility in the quotation.
How long is the production lead time for an export order?
Lead time varies with profile availability, panel quantity, and fabrication complexity such as cut-to-size and stair treads. Typical custom orders ship within several weeks of drawing approval. We confirm a firm production and delivery schedule with every quotation.
What standards and load data do you provide?
Our manufacturing operates under an ISO 9001 quality system, with CE documentation available for European buyers. Because safe loads depend on bar profile, resin, span, and safety factor, we issue engineered load and deflection tables specific to your configuration rather than generic figures — request them with your quote.