GFRP rebar.
Glass fibre reinforced polymer reinforcement for concrete — corrosion-free, lighter than steel, and built to outlast the structures it sits in.
- −70 %
- CO₂ vs steel
- 80+ yr
- service life
- 2.4×
- tensile vs steel
- Ø 6–16 mm
- certified diameters
What it does
differently.
Six reasons to choose GFRP when steel wouldn't last the life of the structure — or when carbon is part of the spec.
- Corrosion-free
It doesn't rust in salt, chemicals or moisture — the most common reason concrete structures fail.
- Lower carbon
Up to 70 % less CO₂ in production than steel rebar. Earns LEED, BREEAM and DGNB credits.
- Built to last
80+ years of service inside concrete. Outlives most of the buildings being designed today.
- Lighter to handle
Four times lighter than steel. One truck of GFRP replaces seven steel trucks — fewer deliveries, lower transport carbon.
- Radio-transparent
Invisible to MRI scanners, 5G, Wi-Fi and rail signalling. Enables embedded sensors without infrastructure.
- Cut on site
No welding, no heavy equipment. The site team works with the kit they already own.
Four forms,
one material.
We supply the GFRP reinforcement family for most of the concrete structures we're asked about. Straight bars and stirrups for everyday work, meshes for slab decks, custom shapes when projects need them.
- Straight bars
Standard linear reinforcement — slabs, walls, beams, foundations. Continuous coils on small diameters, bars on larger ones.
Ø 6 – 16 mm · continuous coils - Stirrups
Closed or open shapes for shear reinforcement, bent to drawing. Made to project specification.
Ø 6 – 12 mm · bent to spec - Welded meshes
Pre-tied flat meshes for slab decks, ground beams, retaining wall refurbishment and curtain walls.
Ø 6 – 12 mm · 50 × 50 to 200 × 200 mm grid - Custom shapes
Custom curves, hooks and laminations within the limits of continuous-fibre production — co-engineered with the design office.
Project-specific
Continuous fibres,
continuous lengths.
Conventional FRP rebar is made in two stages: pultrusion of the core, then mechanical application of the surface ribs. The process breaks fibres and limits bar length. Our Nidletrusion process forms the anchorage profile in a single continuous run. Fibres remain intact, lengths are effectively unlimited, and the bar carries more fibre by mass than the FRP it replaces.
- A Sand-coated surface
A rough finish that grips the concrete around it — comparable to the ribbed steel rebar engineers know.
- B Continuous helical wrap
Formed in the same Nidletrusion run as the core, not glued on. No interruption to the fibres.
- C Continuous-fibre core
80 %+ glass fibre by mass, bound in a nano-epoxy resin matrix — not the polyester resin used in conventional FRP.
- 01Continuous fibres
E-glass roving drawn from spools, never cut.
- 02Resin bath
Nano-epoxy impregnation — full saturation, no voids.
- 03Helical winding
Anchorage profile formed in the same continuous run.
- 04Cure & coat
Sand-coating, thermal cure, dimensional check.
GFRP is not a universal replacement for steel. It is a specialised solution for environments where corrosion drives lifecycle cost.
What you'll
find here.
Same product, three different conversations. Skip to the part of this page that matters to you — or open the full path for your role.
- 01 PROJECT ENGINEERSSpec sheets, on hand.
Full technical specification, the European Technical Assessment ETA 23/0523 (EAD 260023-00-0301), BIM family and per-diameter mill test certificates.
Jump to the spec - 02 DEVELOPERS · CONTRACTORSThe commercial case.
Lifecycle cost compared to steel, three reference projects and the sustainability story for LEED, BREEAM and DGNB.
Open the developer's path - 03 DEALERS · DISTRIBUTORSSamples & partnership.
Sample bundles to evaluate, regional partnership terms and the onboarding flow from enquiry to first order.
Open the dealer's path
The material
in numbers.
The values below are independently verified. Mill test certificates, the European Technical Assessment and the EPD are available on request.
The diameter
range, in full.
From Ø 6 mm in continuous coils, to Ø 16 mm structural bars. Smaller diameters come on continuous spools — fewer joints, less waste, faster installation. Each shipment carries its mill test certificate.
Values typical at 23 °C. Tensile strength decreases as bar diameter increases. Bendable diameters: Ø 6 – 12 mm. Mill test certificate supplied per shipment.
Certified, on file.
Every shipment carries its mill test certificate. The product itself is certified under the Slovak technical approval body and the European Technical Assessment.
- TSÚS · SKin force since 2022Slovak Building Approval
National technical approval, with annual surveillance audit of the Galanta manufacturing facility.
View certificate - ETA · EUETA 23/0523European Technical Assessment
First ETA for GFRP rebar in Europe. A recognised certification that lets engineers use it in CE-marked submissions.
View ETA - EPDEN 15804 +A2Environmental Product Declaration
EuCIA-verified. Reports cradle-to-gate carbon and the full lifecycle dataset.
Download EPD - MILL CERTper shipmentMill test certificate
Tensile, modulus and bond test results from the batch the bars were drawn from.
Sample · PDF - BIMIFC · RevitBIM family
Generic Revit family with the full diameter range. IFC export available on request.
Download family - STANDARDSISO 10406-1International design codes
Practice references: ACI 440.11-22, CSA S806/S807, fib Model Code 2020, ISO 10406-1.
Reference index
GFRP rebar, in depth.
What buyers ask first.
- GFRP (Glass Fibre Reinforced Polymer) rebar is concrete reinforcement made from continuous glass fibres bound in a nano-epoxy resin matrix and finished with a sand-coated, helically wrapped surface for mechanical bond. It replaces steel rebar one-for-one in concrete structures and is specified across EN 1992, ACI 440.11-22, fib MC 2020 §17 and ISO 10406-1. Composite Group manufactures GFRP rebar at its Galanta facility under ETA 23/0523 (EAD 260023-00-0301).
- Composite Group GFRP rebar reaches 940 to 1,200 MPa tensile strength depending on diameter — roughly twice the yield strength of typical steel rebar. The modulus of elasticity is about 52 GPa (versus 200 GPa for steel), which is why GFRP designs work the section in tension and use higher reinforcement ratios than steel-equivalent sections. Bar-by-bar values are published on the mill test certificates that ship with every coil.
- Composite Group produces GFRP rebar from Ø 6 to Ø 16 mm in straight bars and in continuous coils for site-bent applications. The 6–10 mm range is supplied in coils for high-volume slab and deck work (the Mibach airline hangar delivered 82 km of GFRP in coils). 12–16 mm sizes are typically straight bars cut to project length.
- Field-recovered GFRP samples and accelerated-ageing models per ACI 440 and fib MC 2020 §17 give a service life of 80+ years inside concrete at typical XC and XS exposure classes. That is up to two times the realistic service life of carbon steel reinforcement in chloride or sulphate environments. GFRP does not corrode, so the structure does not lose section to oxide expansion over time.
- Composite Group GFRP rebar holds ETA 23/0523 (EAD 260023-00-0301) — the first European Technical Assessment issued for GFRP reinforcement — plus TSÚS Slovak Building Approval and an EN 15804 +A2 EPD. Project-specific assessments for novel exposure classes route through the same EAD. ETA listing is what allows specifications referencing CPR (Construction Products Regulation) to call up GFRP without a national derogation.
- EuCIA-verified EPD data gives GFRP rebar a CO₂ footprint up to 70 percent lower (EuCIA) than carbon steel rebar per kg of reinforcement equivalent. On individual projects the saving can run higher: the Jizan flood channel — 21.3 km, world’s largest FRP structure — measured a 91 percent project-specific reduction in embodied carbon versus its steel-equivalent design. Carbon savings come from both the lighter mass (4× lighter than steel) and the lower process-energy demand of pultrusion vs. blast-furnace + rolling.
What is GFRP rebar?
What is the tensile strength of GFRP rebar?
What diameters does GFRP rebar come in?
How long does GFRP rebar last?
Is GFRP rebar approved in Europe?
How much CO₂ does GFRP rebar save vs. steel?
A three-step pilot —
to test it,
not commit to it.
We join projects as a partner, not a supplier. The first step is simply checking whether GFRP fits the element — not a commitment to switch.
- 01Technical workshop
Half-day with your engineering team. Design assumptions, detailing approach, code-compatible documentation.
- 02Sample delivery
Physical material samples and a bill-of-materials comparison — steel vs. GFRP for the same element.
- 03Pilot pour
One documented pour, with installation feedback, post-pour review and a scaling roadmap for the next elements.
Suitable first-pilot elements: bridge deck sections · parapets · drainage channels · retaining walls · roadside slabs.
