Fiberglass flat bars (FRP bar stock)
Solid rectangular pultruded fiberglass bars from 12×3 mm to 305×25 mm, held to ±0.25 mm on thickness. Used as stiffeners, splice plates, wear strips and spacers.
- A
- 1,000 mm²
- Ix
- 83.3 cm⁴
- Mass
- 1.82 kg/m
Overview
FRP flat bars serve as stiffeners, splice plates, wear strips and spacers. High-modulus bars with up to 70% glass are used for concrete reinforcement and pre-stressed work. Tolerances of ±0.25 mm on thickness and ±0.5 mm on width give a reliable fit-up.
- ±0.25 mm on thickness
- Up to 70% glass
- EN 13706 and ASTM D3917
- 6 m lengths or cut to size
Sizes 18 catalog sizes
| Model | Drawing and quote | ||||||
|---|---|---|---|---|---|---|---|
| FB 12×3 | 12 | 3 | 0.07 | 36 | 0.043 | 0.003 | DXFQuote |
| FB 20×3 | 20 | 3 | 0.11 | 60 | 0.2 | 0.005 | DXFQuote |
| FB 25×3 | 25 | 3 | 0.14 | 75 | 0.391 | 0.006 | DXFQuote |
| FB 25×5 | 25 | 5 | 0.23 | 125 | 0.651 | 0.026 | DXFQuote |
| FB 30×4 | 30 | 4 | 0.22 | 120 | 0.9 | 0.016 | DXFQuote |
| FB 38×4.8 | 38 | 4.8 | 0.33 | 182.4 | 2.195 | 0.035 | DXFQuote |
| FB 50×5 | 50 | 5 | 0.45 | 250 | 5.208 | 0.052 | DXFQuote |
| FB 50×6 | 50 | 6 | 0.55 | 300 | 6.25 | 0.09 | DXFQuote |
| FB 50×10 | 50 | 10 | 0.91 | 500 | 10.42 | 0.417 | DXFQuote |
| FB 75×6 | 75 | 6 | 0.82 | 450 | 21.09 | 0.135 | DXFQuote |
| FB 75×10 | 75 | 10 | 1.36 | 750 | 35.16 | 0.625 | DXFQuote |
| FB 100×6 | 100 | 6 | 1.09 | 600 | 50 | 0.18 | DXFQuote |
| FB 100×10 | 100 | 10 | 1.82 | 1,000 | 83.33 | 0.833 | DXFQuote |
| FB 100×15 | 100 | 15 | 2.73 | 1,500 | 125 | 2.813 | DXFQuote |
| FB 150×10 | 150 | 10 | 2.73 | 1,500 | 281.3 | 1.25 | DXFQuote |
| FB 150×15 | 150 | 15 | 4.09 | 2,250 | 421.9 | 4.219 | DXFQuote |
| FB 200×15 | 200 | 15 | 5.45 | 3,000 | 1,000 | 5.625 | DXFQuote |
| FB 305×25 | 305 | 25 | 13.86 | 7,625 | 5,911 | 39.71 | DXFQuote |
Catalog dimensions identify standard section options, not live inventory. Confirm tooling, material, quantity and production timing in the quotation.
Wider than 305 mm: fiberglass sheetsA size not listed: custom pultrusion
Properties
Standard laminate · EN 13706 E23
| Property | Value | Test method |
|---|---|---|
| Tensile modulus (longitudinal)EN ISO 527-4 | 23 GPa | EN ISO 527-4 |
| Tensile modulus (transverse)EN ISO 527-4 | 7 GPa | EN ISO 527-4 |
| Tensile strength (longitudinal)EN ISO 527-4 | 240 MPa | EN ISO 527-4 |
| Flexural strength (longitudinal)EN ISO 14125 | 240 MPa | EN ISO 14125 |
| Interlaminar shear strength (ILSS)EN ISO 14130 | 30 MPa | EN ISO 14130 |
| Pin-bearing strength (longitudinal)EN 13706-2 Annex E | 150 MPa | EN 13706-2 Annex E |
| DensityEN ISO 1183 | 1.9 g/cm³ | EN ISO 1183 |
| Glass contentEN ISO 1172 | 65–70% by weight | EN ISO 1172 |
Values of the isophthalic polyester laminate every datasheet lists. Moduli and strengths are the EN 13706-3 E23 minimums; ILSS is published above the 25 MPa minimum. Transverse strength is much lower than longitudinal, so connections need their own check. Full property table and test methods
Resin options
- Isophthalic polyesterStandard laminate for general structural use. Not fire-retardant.
- Fire-retardant polyesterFor an ASTM E84 Class 1 requirement in mild chemistry; the test report is issued per profile.
- Vinyl esterChemicals, seawater and wastewater; fire-retardant with low smoke.
- PolyurethaneTough matrix for thin walls and impact.
- PhenolicFire-critical enclosed spaces: low flame spread, smoke and toxicity.
All are declared to grade E23. Resin decides chemical and fire performance, not stiffness. Compare resin systems
Applications
Case study · Project photoFactory access staircaseA bolted FRP stair in our Chongqing plant, assembled by four people with hand tools: no welding, hot work or crane.Profiles used Flat bar kick plates in UV-stabilised polyester
Application · Project photoFRP solar mounting profilesFlat bars and custom sections for clips, spacers, and edge members.
ApplicationFRP chemical plant platformsFRP angles and flat bars for bracing, toe boards, and splice plates.
Documents
- Data sheet18 sizes · web page
Flat bar datasheets
- Issued by
- F1 Composite
One page per size: dimensions, calculated section properties, E23 laminate data and, where published, allowable load by span.
- CADDXF · 18 sizes
Flat bar section drawings
- Issued by
- F1 Composite
Dimensioned cross-sections that open in AutoCAD, DraftSight or LibreCAD. Download one from its row in the size table; no login or email.
- Data sheetPDF · 3 MB
FRP Profile Design Manual — DOC-PF-2026-EN Rev. B
- Issued by
- F1 Composite
- For
- Structural shapes
Revision B (October 2026), generated from the website's catalog, laminate and design-basis data: EN 13706 E23 laminate values beside the grade minimums, section properties of all 114 catalog sizes, allowable uniform loads to the published LRFD screening basis, application guides, durability stated by resin formulation, fabrication and inspection. A preliminary-sizing reference, not a project approval or batch certificate; it supersedes the withdrawn Rev. A.
- CertificatePDF · 142 KB
EPD & Carbon Footprint — Pultruded GFRP Composite Profiles
- Issued by
- CABR
- For
- Standard profiles
Environmental Product Declaration and product carbon footprint analysis for F1 Composite pultruded GFRP composite profile products, with 1 m² functional unit. Calculation reference CABR-CFC-01(02)-2025(20030)1, cradle-to-gate 33,934.34 g CO₂e/m², distribution 254.59 g, cradle-to-grave 36,099.32 g. Standards: GB/T 24025-2009 (ISO 14025-aligned Type III EPD), GB/T 32161-2015, ISO 14067, PAS 2050. Issued by China Academy of Building Research Co., Ltd. (CABR) Certification Center on April 30, 2025.
- CatalogOn request
Product Catalog 2024
- Issued by
- F1 Composite
- For
- All products
Complete catalog of standard pultruded FRP profiles with dimensions, properties, and ordering information.
- CertificateOn request
ISO 9001:2015 Certificate
- For
- All products
Request the current quality-management certificate holder, validity and scope for your proposed supply.
- CertificateOn request
CE Declaration of Performance
- For
- All products
Request product-specific performance and applicable conformity documentation; confirm the intended use and assessment route.
Questions buyers ask
What are pultruded FRP flat bars used for?
FRP flat bars are used as stiffeners, splice plates, wear strips, spacer elements, and rebar replacements in corrosive environments. High-modulus pultruded flat bars (up to 70% glass content) are also used in concrete reinforcement and pre-stressed structural applications where steel rebar would corrode.
How does FRP flat bar compare to steel flat bar?
Pultruded FRP flat bar is approximately 75% lighter than equivalent steel flat bar (1.9 g/cm³ vs 7.85 g/cm³), does not rust, and is non-conductive and non-magnetic. Tensile strength is comparable to mild steel (240–400 MPa for FRP vs 400 MPa for A36), so per kilogram FRP is stronger. Stiffness is roughly 1/10 that of steel, so deflection often governs design.
What tolerances do F1 Composite flat bars hold?
Standard tolerances are ±0.25 mm on thickness and ±0.5 mm on width, in line with EN 13706 and ASTM D3917. Lengths are typically supplied at 6 m (or per cut order) with ±5 mm length tolerance. Tighter tolerances are available for precision applications on request.
Can FRP flat bars replace steel rebar in concrete?
Yes. Pultruded FRP flat bars and rods with 65–70% unidirectional glass roving are used as non-corrosive reinforcement in concrete, especially in marine structures, parking decks, MRI rooms, and chemically exposed slabs. They cannot rust, so they remove corrosion-induced cracking; the design life comes from the project's design and exposure. Sand-coated or helically wound surfaces improve concrete bond.
Quote FRP flat bars
Send the size, length and quantity, the service environment and the destination. We reply within one business day; a formal quotation follows once the specification and delivery are reviewed.
- Lengths & tolerances
- Catalog sections come in 6 m lengths or cut to your length. Give the piece length and count, say whether ASTM D3917 or EN 13706 tolerances apply, and mark any tighter tolerances, holes or end cuts on the drawing.
- Resin & surface
- Polyester suits general structural use; vinyl ester is the usual choice for chemicals, seawater and wastewater. Tell us the chemicals, concentration, temperature, outdoor exposure, color and any fire requirement, and we will confirm the resin and surface veil.
- Quantity & samples
- Catalog sections ship in 2–4 weeks. Give the trial quantity and the expected repeat demand; minimum quantities and samples are confirmed for the section and resin you choose.
- Documents & delivery
- Each production batch ships with a mill test certificate. Include the destination and target date, and we will quote FOB or DDP with the packing method and shipping schedule.