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FRP rebar sizes refer to the nominal bar diameters used in concrete reinforcement design. Like steel, composite rebar is available in common diameter ranges, but the internal fiber content and resin system determine its final strength.
For a complete explanation of FRP material types, structural performance, and manufacturing details, you can refer to our FRP Rebar Pillar Page.
Most composite rebar is supplied in the following nominal diameters:
Ø6 mm
Ø8 mm
Ø10 mm
Ø12 mm
Ø14 mm
Ø16 mm
Ø18 mm
Ø20 mm
Ø22 mm
Ø25 mm
Custom sizes can be produced based on project requirements.
Bars can be manufactured as:
Straight lengths
Coils (small diameters)
Preformed shapes for stirrups and hooks
The following table summarizes typical strength ranges for common sizes. (Values represent common industry ranges; exact values depend on fiber type and resin system.)
| FRP Rebar Size | Typical Tensile Strength | Modulus of Elasticity | Notes |
|---|---|---|---|
| Ø6–Ø8 mm | Medium to High | Standard Modulus | Suitable for slabs and distribution layers |
| Ø10–Ø12 mm | High | Standard / High Modulus | Common for beams, walls, and general reinforcement |
| Ø14–Ø16 mm | High | High Modulus | Suitable for bridges and heavy-duty structures |
| Ø18–Ø20 mm | Very High | High Modulus | Used in marine and corrosion-critical elements |
| Ø22–Ø25 mm | Very High | High Modulus | Heavy infrastructure and long-span elements |
Strength depends on:
Fiber type (glass / basalt / carbon)
Resin system
Surface structure
Production tension control
Structural elements requiring high tension capacity generally use larger diameters and higher modulus grades.
FRP rebar often requires similar cover thickness as steel. Larger diameters require larger structural spacing.
Engineers must ensure bar spacing remains compliant with project design to avoid congestion in heavily reinforced areas.
Smaller diameters in coil form are easier for on-site logistics. Larger diameters are typically delivered in straight lengths.
Marine structures or chemical plants often use larger, high-modulus bars due to long-term durability needs.
Small Diameters (Ø6–Ø10)
Slabs, sidewalk panels, thin walls, architectural elements
Precast components and lightweight elements
Medium Diameters (Ø12–Ø16)
Retaining walls, bridge slabs, industrial floors
General-purpose structural reinforcement
Large Diameters (Ø18–Ø25)
Marine foundations, high-load beams, transportation platforms
Heavy infrastructure requiring extended service life
FRP sizes follow similar nominal diameters but differ in material strength and stiffness.
FRP does not have yield strength like steel; design is based on ultimate tensile strength.
Crack control may require designers to consider modulus variations.
Weight per meter is lower than steel, improving handling efficiency.
Before ordering FRP rebar for large projects, confirm:
Required bar diameter and strength grade
Straight or coil delivery format
Surface profile (sand-coated, ribbed, or wrapped)
Cut lengths or factory-prepared shapes
Export packaging requirements
Labeling for on-site identification
For buyers comparing multiple reinforcement types or performance levels, refer to our Comprehensive FRP Rebar Guide.
GTOFRP™ can supply:
Standard diameters Ø6–Ø25
Customizable sizes for infrastructure projects
High-modulus and standard-modulus grades
Sand-coated or thread-wrapped surface finishes
Bulk packaging for global shipping
Our production lines maintain stable fiber alignment and consistent curing, ensuring uniform bar dimensions across large orders.
1. Do FRP rebar sizes match steel rebar sizes?
Nominal diameters are similar, but mechanical properties differ.
2. Are larger diameters always stronger?
Typically yes, but fiber content and resin formulation affect final performance.
3. Can FRP rebar be produced in custom sizes?
Yes, depending on tooling and project requirements.
4. Are all sizes available in coil form?
Only smaller diameters. Larger diameters come as straight bars.
5. Does bar size affect concrete compatibility?
No. Standard mixes work with all FRP diameters.
6. How does bar diameter affect installation?
Larger bars require more stable chairs and careful alignment.
Understanding FRP rebar sizes is essential for accurate structural design, procurement planning, and installation efficiency. With a wide range of diameters and strength levels, FRP reinforcement provides flexibility for both light and heavy-duty applications. Consistent sizing and high durability make it a reliable choice for modern infrastructure projects.
