Straight bars and factory-formed shapes for concrete exposed to chlorides, chemicals, magnetic fields or weight constraints. Start with GFRP, then qualify the fiber, resin, surface and guaranteed design values against the project standard.
Send the dimensions, quantity, service environment, and destination for a scoped response.
F1 Composite supplies FRP reinforcing bars against a project bar schedule. Diameter is only the first decision: fiber type, resin chemistry, surface enhancement, measured area, tensile modulus, guaranteed tensile force, bond performance and environmental reduction factors must remain tied to one qualified production grade.
Send the drawings and governing standard before pricing. We return a diameter-by-diameter offer with cut lengths, factory bends, packaging, inspection plan and the test evidence available for the proposed grade.
4–40 mm
GFRP straight-bar catalog range
15 sizes
published GFRP diameters
10 sizes
published BFRP diameters
2 surfaces
sand-coated or fully threaded
Portfolio figures above are supplier-published screening values, not design allowables. Contract values must be stated for the exact fiber/resin/bar grade and supported by the required qualification and production-lot records.
The current manufacturing-source catalog publishes fifteen GFRP straight-bar diameters, ten BFRP straight-bar diameters and five factory-formed GFRP stirrup diameters. “Published” confirms catalog availability only; stock, MOQ, cut length, resin and qualification status are checked again for every quotation.
Swipe the table horizontally to compare GFRP, BFRP and stirrup availability.
| Nominal diameter | Nominal circle area† | GFRP straight bar | BFRP straight bar | GFRP stirrup |
|---|---|---|---|---|
| Ø4 mm | 12.6 mm² | Published | — | — |
| Ø6 mm | 28.3 mm² | Published | — | Published |
| Ø8 mm | 50.3 mm² | Published | Published | Published |
| Ø10 mm | 78.5 mm² | Published | Published | Published |
| Ø12 mm | 113.1 mm² | Published | Published | Published |
| Ø14 mm | 153.9 mm² | Published | Published | Published |
| Ø16 mm | 201.1 mm² | Published | Published | — |
| Ø18 mm | 254.5 mm² | Published | Published | — |
| Ø20 mm | 314.2 mm² | Published | Published | — |
| Ø22 mm | 380.1 mm² | Published | — | — |
| Ø25 mm | 490.9 mm² | Published | Published | — |
| Ø28 mm | 615.8 mm² | Published | — | — |
| Ø30 mm | 706.9 mm² | Published | — | — |
| Ø32 mm | 804.2 mm² | Published | Published | — |
| Ø40 mm | 1256.6 mm² | Published | Published | — |
† Nominal circle area = πd²/4, calculated from the listed diameter for early RFQ comparison. It is not the measured cross-sectional area used for ASTM qualification or structural design. “—” means the size is not published for that material/form; it may still be available as a custom order.
| Specification item | Standard starting point | Project options / controls |
|---|---|---|
| Fiber system | GFRP for mainstream concrete reinforcement | BFRP and CFRP by project specification |
| Nominal diameter | GFRP 4–40 mm; BFRP 8–40 mm; GFRP stirrups 6–14 mm | Use the diameter matrix above; unlisted sizes require tooling and MOQ confirmation |
| Surface profile | Sand-coated or fully threaded / helically wrapped | BFRP shaped / polished surface and bond pattern matched to qualification data |
| Matrix | Vinyl ester or project-qualified resin system | Chemistry selected for alkali, chloride and temperature exposure |
| Supply form | Straight cut lengths | Factory-formed 6–14 mm stirrups and custom shapes by drawing |
| Cut length | Released against the project bar schedule | Confirm maximum continuous length, container limit and bundle plan in the quotation |
| Color | Natural, yellow, gray or project color | Color is not a substitute for fiber / resin identification |
| Documentation | Dimensional and batch inspection records | Project test reports, certificates and bar schedule traceability |
Standard inquiry route
Marine, bridge decks, wastewater and electrically sensitive concrete
The standard starting point for corrosion-resistant reinforcement. Glass-fiber bars are lightweight, non-magnetic and electrically insulating, but their modulus and failure mode differ from steel.
Confirm grade and qualification
Projects that specify basalt reinforcement or ASTM D8505 qualification
Basalt-fiber bars can share the corrosion and electrical-isolation advantages of GFRP. The offered grade still requires its own qualification and guaranteed design properties.
Project-specific supply
High-modulus, weight-critical and specialty reinforcement
Carbon-fiber bars can provide substantially higher stiffness, but they are electrically conductive and carry a different cost and design basis. Do not group them under a generic non-conductive FRP claim.
FRP rebar is most valuable where steel corrosion, magnetic response, electrical conduction or handling weight is a real project cost. The material is not an automatic upgrade when fire exposure, ductility or familiar steel detailing controls the design.
Remove steel-corrosion risk where de-icing salts and chloride splash drive cracking, delamination and repair cycles.
Reinforce seawalls, piers, quay structures and flood defenses without creating an electrochemical corrosion path.
Use non-magnetic, electrically insulating reinforcement around traction power, signaling and sensitive equipment where the specified fiber system allows it.
Match the resin system and cover design to chlorides, treatment chemicals, wet-dry cycles and the project service temperature.
GFRP and BFRP reinforcement avoid magnetic-field distortion and electrical conduction; CFRP is not suitable when electrical insulation is the controlling requirement.
Straight bars, dowels and factory-formed shapes can be scheduled for foundations, barriers, panels and other reinforced-concrete elements.
Design difference
Treating the two materials as interchangeable hides the decisions that control serviceability, anchorage, temperature exposure and failure mode.
For independent laboratory results, monitored bridge decks and a project-specific lifecycle-cost sensitivity, read our fiberglass rebar vs steel evidence review.
| Topic | FRP rebar | Steel rebar |
|---|---|---|
| Corrosion mechanism | No electrochemical rusting; durability still depends on fiber, resin, moisture, alkali and temperature | Can corrode after chlorides or carbonation reach the reinforcement |
| Weight | Roughly one quarter of steel by density for the published 2.1 g/cm³ baseline | Approximately 7.85 g/cm³ |
| Stress-strain response | Linear-elastic to rupture; no steel-like yield plateau | Ductile yielding is normally part of the design model |
| Stiffness | Fiber-dependent and usually lower than steel for GFRP / BFRP | About 200 GPa elastic modulus |
| Bending and detailing | No field bending; order bends and stirrups factory-formed to the approved schedule | Can be bent within code and fabrication limits |
| Electrical behavior | GFRP / BFRP are insulating; CFRP is conductive | Conductive |
A web-page tensile number is not a material specification. State the governing product, test, design and construction documents, then require the offered bar grade to show how it qualifies.
ASTM D7957/D7957M-25
Qualification, production-lot control, geometry, physical properties and mechanical requirements for surface-enhanced GFRP bars.
ASTM D8505/D8505M-25
Specification for straight, solid-round BFRP and GFRP bars with surface enhancement for internal concrete reinforcement.
ASTM D7205/D7205M-26
Test method for tensile force, strength, strain, chord modulus and the stress-strain curve of FRP composite bars.
ACI CODE-440.11-22
Building-code requirements for structural systems, members and connections reinforced with qualified GFRP bars.
ACI SPEC-440.5-22
Project specification covering submittals, delivery, storage, handling, placement, tolerances and inspection.
Minimum useful submittal set
Bar identification and dimensions · fiber and resin declaration · measured area · guaranteed tensile force and modulus · bond and shear results · cure / glass-transition evidence · alkali and moisture data · bend qualification where applicable · lot traceability and inspection plan.
FRP rebar is a solid composite reinforcing bar made from continuous fibers held in a polymer matrix. The bar normally has sand coating, ribs or a helical wrap to transfer force into concrete. GFRP uses glass fiber, BFRP uses basalt fiber, and CFRP uses carbon fiber; they are not interchangeable material grades.
No. FRP reinforcement has a different modulus, bond behavior, creep-rupture basis, temperature response and linear-elastic rupture mode. A qualified engineer must redesign the member and detailing under the applicable code instead of substituting the same bar area automatically.
No. Thermoset FRP bars must not be field bent after cure. Bends, hooks, stirrups and other shapes are manufactured to an approved bending schedule, with bend radius and retained tensile capacity tied to the qualified product.
No. GFRP and BFRP bars are electrically insulating and non-magnetic, while carbon fibers conduct electricity. If electrical isolation, MRI compatibility or radio-frequency transparency controls the project, state it in the RFQ and do not accept a generic FRP substitution.
The current supplier catalog lists GFRP straight bars at 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 25, 28, 30, 32 and 40 mm; BFRP straight bars at 8, 10, 12, 14, 16, 18, 20, 25, 32 and 40 mm; and factory-formed GFRP stirrups at 6, 8, 10, 12 and 14 mm. Measured cross-sectional area, tolerance, unit weight, cut length and bend geometry are confirmed on the project data sheet before order release.
Send the governing standard and edition, bar or metric designation, straight-length schedule, bend schedule, surface type, fiber and resin requirements, exposure class, design values, testing and certificate requirements, quantity by diameter, packing limits, destination and Incoterm.
Send the dimensions, quantity, service environment, and destination. Engineering responds within one business day.