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We, at DL, design and manufacture innovative, high-quality construction equipment and components that shape the future of the construction industry

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Contact us to develop effective reinforcing alternatives to heavy, corrosive steels and advancements at each level to make building structures easier, safer, and more efficient.

Fiberglass Rebar–also known as FRP, GFRP

industrial engineering

DL FRP Rebar. The new generation of fibre-reinforced composite reinforcement bars. Combine extremely high strengths with low weight and longer service life. Specially developed for demanding applications that require high mechanical stability and corrosion resistance from reinforcement bars. Available as:

  • DL GFRP Rebar – Glass-fibre-reinforced plastic (GFRP)
  • DL BFRP Rebar – Basalt-fibre-reinforced plastic (BFRP)


Fiber Reinforced Polymer Reinforcement Bar

Significantly reduced maintenance and service life costs compared to conventional steel rebars

High performance replacement for reinforcement bars made of: Inox stainless steel, Epoxy coated steel, Galvanised steel and Black steel/ reinforcement steel

For demanding fields of application

Reference projects

DL FRP Rebars were especially developed for demanding fields of application in aggressive environments, where reinforcement bars have to withstand permanently high mechanical and corrosive loads. Durostone® FRP Rebars have outstanding properties for such requirements. For example:

Corrosion resistance

Building structures next to sea and in coastal regions which are exposed to severe corrosion: harbour installations, docks, underwater tunnels, desalinisation plants, breakwaters, embankments, quay walls, windmills, roads and buildings and concrete roadbases exposed to sea spray

Alkali-resistance & durability

All concrete structures and transport routes exposed to frost and thawing saltwater: bridge decks, road construction, air fields, concrete casings, flood protection walls; canals and harbour basins (fresh water engineering), lock walls, dam projects

Chemical resistance

Structures in aggressive chemical media environments: Sewage treatment and biogas plants, refineries, paper mills, sewer systems, underground garages also without floor coatings, industrial floor slabs, agrarian buildings such as silage and fertiliser silos

Easy machinability

Special civil engineering, tunnel construction, mining and inner-city infrastructure buildings: temporary and permanent anchors. Easy cuttability for tunnel-boring machines (TBM) in soft eyes, concrete reinforcement for underground railway construction and road tunnels, rock face stabilisation, soil nails, anchor pins, diaphragm walls, bored piles

No conductivity & no frequency disturbance

Sensitive functional areas in which electric and thermally non-conductive, induction-free, non-magnetic or signal-permeable reinforcements are necessary: high voltage installations, transformer buildings, railway and airport structures, slab roadways, frequency sensitive switching and control installations, telecommunications infrastructures, industrial systems with driverless transport systems, medical and research institutions

High tensile strength & minimum component thickness

Prestressing technology: DL BFRP Rebars with basalt fibre reinforcing are especially suitable for prestressing technology with very high tensile strength Filigree and solid prefabricated concrete parts: lightweight material for core-insulated double walls, sandwich elements, solid concrete panels and facade elements with high quality design surfaces. Concrete preformed structures in tunnel construction, sewer pipes, shaft accesses, concrete sleepers

High corrosion resistance – No rust

  • Permanent alkali and chemical resistance and high acid resistance, also in very demanding environments.
  • Resistant to concrete carbonation and in the event of acidic impact, e. g. aggressive mountain water or industrial waste water.
  • Prevents concrete spalling and protects static structural parts.

High economic efficiency – Reduction of lifecycle costs

  • Significantly reduced maintenance and service life costs.
  • Considerably lower to no repair and replacement costs
  • More quality, but no higher construction costs; instead, savings potential compared to steel
  • Cost reduction of structures through minimal requirements for concrete covering (rod diameter + 10 mm), through possible use of conventional concrete qualities or through elimination of expensive additives and protective coatings
  • Up to fourfold savings in transport costs due to 73 % lower deadweight.

Greater mechanical stability with low weight – High strength

  • Enormous tensile strength and first class durability of mechanical properties.
  • Very good bond strength properties for ideal force transmission.
  • Lightweight material with only 27 % of the weight of steel.
  • Minimised deadweight of concrete structures. Permits filigree structures.
  • Much easier and less dangerous handling on building sites.

High safety and functionality

  • No electric or electromagnetic conductivity.
  • No magnetism and no disruption of sensitive electronic installations.
  • Transparent for radar and radio waves.
  • Very low heat conductivity, as a result avoidance of thermal bridges.
  • Easy machinability. Easy cutting properties of the reinforcement prevents damage to tools and machinery in civil engineering and tunnel construction.

Long service life and extremely high quality – Sustainable

  • High quality corrosion resistant fibres and highly durable quality resins and the precise  DL FRP Rebar manufacturing process ensure outstanding qualities and an innovative building material with uniquely bundled properties .
  • Sturdy, durable composite reinforcement in concrete 
  • Much longer service life for heavily stressed structures

Production range

  • Standard sizes: 10 mm, 13 mm, 16 mm, 19 mm, 25 mm, 32 mm
  • Other tailor-made sizes available on request
construction example

Internal Reinforcement

Corrosion is probably the biggest civil engineering issue that forces builders, governments, and contractors to spend billions of dollars on the rehabilitation of steel-reinforced concrete structures. The leading advantage of using fiberglass bars as an internal reinforcement is that it enables concrete structures to achieve long service life without any major maintenance. Following are some of the advantages of using fiberglass bars:

Ease of installation

The fiberglass bars are one-fourth the weight of steel bars, making it easier for engineers to complete a project within time restraints.

Environmental durability

Fiberglass bars, as mentioned earlier, are corrosion-resistant which enables engineers to build durable concrete structures in the chloride-rich environment. Marine structures, therefore, should be built with GFRP reinforcement bars.

Electrically and thermally non-conductive

Since fiberglass bars do not contain any metal, they are thermally and electrically con-conductive. This property makes fiberglass reinforcement an ideal material for sensitive buildings like research facilities, health facilities, power plants, etc.

Lower life-cycle cost

Initial cost of reinforcing concrete with GFRP could be relatively high. However, the ability to sustain harsh environment makes fiberglass bars a cost-effective building material.

The use of GFRP in civil engineering enables engineers to achieve better functionality, safety, and economy of construction. Following are some of the new construction applications of GFRP bars:

From highway to marine structures, GFRP has proven and tested to be the best construction material available in the global rebar market