Request a datasheet
THE PRODUCT

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
Request a datasheet See the specification
Composite Group GFRP rebar — studio plate
WHY GFRP

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.

GFRP reinforcement mat tied in formwork before casting
A GFRP reinforcement mat, tied and ready for the pour. The bars stay corrosion-free for the full service life of the slab they sit in.
MATERIAL IN PLACE · REINFORCEMENT MAT
THE RANGE

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
NIDLETRUSION

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
    Helically profiled surface

    A continuous raised profile that keys into 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.

GFRP rebar — surface detail
PLATE 03
Ø 12 mm · surface
The process · four stages
Single continuous run · no joints
  1. 01
    Continuous fibres

    E-glass roving drawn from spools, never cut.

  2. 02
    Resin bath

    Nano-epoxy impregnation — full saturation, no voids.

  3. 03
    Helical winding

    Anchorage profile formed in the same continuous run.

  4. 04
    Cure & inspect

    Thermal cure, cooling and dimensional check.

GFRP is not a universal replacement for steel. It is a specialised solution for environments where corrosion drives lifecycle cost.
Independent engineering assessment · 2026
FOR YOUR ROLE

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.

TECHNICAL SPECIFICATION

The material
in numbers.

The values below are independently verified. Mill test certificates, the European Technical Assessment and the EPD are available on request.

Request a datasheet
M MECHANICAL
Tensile strength σₜ
940 – 1,200 MPa (B500B steel: 500 MPa) — lower at larger diameters
Modulus of elasticity E
~ 52 GPa (B500B steel: 205 GPa)
Strain at failure
εₜ₀ₖ ≈ 0.02 (B500B steel: > 0.05) — linear-elastic to failure, no yielding
Compressive strength
280 – 450 MPa, varies with diameter
Transverse shear τ
145 – 200 MPa, decreases with diameter
Density
~ 2.0 g / cm³ — 1/4 the density of steel
Bond β
≈ 1.0 — comparable to ribbed steel
Technical specification
DIAMETER RANGE

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.

Diameter
Cross-section
Mass / m
Tensile σₜ
Delivery
Typical use
Ø 6
28.3 mm²
0.06 kg
> 1,100 MPa
Coil
Stirrups · meshes
Ø 8
50.3 mm²
0.10 kg
> 1,100 MPa
Coil ↑ 100 m
Stirrups · light slabs
Ø 12
113 mm²
0.23 kg
> 1,050 MPa
Bar · 12 m
Slabs · beams · everyday
Ø 16
201 mm²
0.40 kg
> 880 MPa
Bar · 12 m
Beams · columns

Values typical at 23 °C. Tensile strength decreases as bar diameter increases. Bendable diameters: Ø 6 – 12 mm. Mill test certificate supplied per shipment.

DOCUMENTS

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 · SK
    in force since 2022
    Slovak Building Approval

    National technical approval, with annual surveillance audit of the Galanta manufacturing facility.

    View certificate
  • ETA · EU
    ETA 23/0523
    European Technical Assessment

    First ETA for GFRP rebar in Europe. A recognised certification that lets engineers use it in CE-marked submissions.

    View ETA
  • EPD
    EN 15804 +A2
    Environmental Product Declaration

    EuCIA-verified. Reports cradle-to-gate carbon and the full lifecycle dataset.

    Download EPD
  • MILL CERT
    per shipment
    Mill test certificate

    Tensile, modulus and bond test results from the batch the bars were drawn from.

    Sample · PDF
  • BIM
    IFC · Revit
    BIM family

    Generic Revit family with the full diameter range. IFC export available on request.

    Download family
  • STANDARDS
    ISO 10406-1
    International design codes

    Practice references: ACI 440.11-22, CSA S806/S807, fib Model Code 2020, ISO 10406-1.

    Reference index
EXPLORE THE DETAIL

GFRP rebar, in depth.

QUESTIONS

What buyers ask first.

What is GFRP rebar?
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 helically profiled 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).
What is the tensile strength of GFRP rebar?
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.
What diameters does GFRP rebar come in?
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.
How long does GFRP rebar last?
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.
Is GFRP rebar approved in Europe?
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.
How much CO₂ does GFRP rebar save vs. steel?
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.
NEXT

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.

Start a cooperation Speak with us directly
Email
[email protected]
Phone
+421 917 592 255
Address
Panenská 5, 811 03 Bratislava · SK
Hours
Mon – Fri · 09:00 – 17:00 CET
  1. 01
    Technical workshop

    Half-day with your engineering team. Design assumptions, detailing approach, code-compatible documentation.

    ~ 4 hours
  2. 02
    Sample delivery

    Physical material samples and a bill-of-materials comparison — steel vs. GFRP for the same element.

    ~ 2 weeks
  3. 03
    Pilot pour

    One documented pour, with installation feedback, post-pour review and a scaling roadmap for the next elements.

    Project-dependent

Suitable first-pilot elements: bridge deck sections · parapets · drainage channels · retaining walls · roadside slabs.

Selected from 75+ applicants · Build Better Innovation Challenge 2024
Bouygues FROOT USA