What ASTM D7957, ACI 440.11, CSA S807, ISO 10406-1, EN 1992-1-1 Annex R, AS 5204 and GB/T 26743 each fix for a glass fiber reinforced polymer bar, who asks for them, and the document to request from a supplier against each one. The values on this page are the standards' own minimums, not the properties of any offered bar.
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| Market | Document | What it fixes | Who asks for it | Ask the supplier for |
|---|---|---|---|---|
| United States | ASTM D7957/D7957M-26 ↗ | Solid round GFRP bars: sizes No. 2–No. 10, guaranteed tensile load by size, modulus ≥ 44.8 GPa, bond, shear, durability (Tables 1–2) and minimum guaranteed force by size (Table 3), with lot quality control. | ACI 440.11 projects, US engineers, most export specifications worldwide. | Qualification report per size and the production-lot certificate (five specimens per lot), each stating the edition tested. |
| Canada | CSA S807:19 (R2024) ↗ | FRP bars classified by fiber, modulus grade (I ≥ 40, II ≥ 50, III ≥ 60 GPa) and durability class (D1, D2); covers glass, basalt, carbon and aramid. | Provincial owners (MTO OPSS 1640 requires Grade III, D1, E-CR glass with vinyl ester or epoxy). | Grade and durability class with the test report that supports them. |
| Australia | AS 5204:2023 ↗ | Fibre-reinforced polymer bars for concrete reinforcement: materials, properties, testing and marking. | Australian specifiers; state road agencies add their own clauses (Queensland TMR MRTS271 calls for CSA S807 Grade III bars). | Test reports mapped to AS 5204 clauses plus any state registration the project needs. |
| China | GB/T 26743-2011 · JG/T 406-2013 ↗ | National standard for FRP bars for civil engineering (GB/T 26743) and the building-industry standard for glass FRP bars (JG/T 406): grades by tensile strength, modulus and durability. | Domestic Chinese projects and some Belt-and-Road export specifications. | Factory test reports to the GB/T or JG/T grade when the project is designed to Chinese codes. |
| Russia / CIS | GOST 31938-2012 ↗ | Composite polymer reinforcement for concrete: types, sizes, physical and mechanical requirements. | Russian and CIS projects. | GOST certificate of conformity for the specific type and size range. |
| Market | Document | What it fixes | Who asks for it | Ask the supplier for |
|---|---|---|---|---|
| United States | ACI CODE-440.11-22 ↗ | Building code for concrete reinforced with GFRP bars; references D7957-22; C_E = 0.85; sustained stress ≤ 0.30 f_fd; seismic and fire limits. | Engineers of record for buildings in IBC jurisdictions. | Confirm the bar grade's guaranteed values and modulus feed the designer's 440.11 calculation. |
| United States | AASHTO GFRP-2 (2nd ed., 2018) ↗ | LRFD bridge design guide specification for GFRP-reinforced decks, railings, substructures and foundations. | State DOT bridge offices. | Owner's producer list or approved-product listing, which an importer normally cannot supply. |
| Canada | CSA S806:12 (R2021) · CSA S6:25 ↗ | Design of buildings (S806) and highway bridges (S6, Section 16) with FRP reinforcement. | Canadian engineers of record. | Confirm which grade the design assumed before quoting a substitute. |
| European Union | EN 1992-1-1:2023 Annex R ↗ | Informative annex on FRP reinforcement in Eurocode 2, applied where a national annex allows it. | European engineers, subject to national adoption. | Nothing product-specific: Annex R is a design method, not a product certification. |
| Market | Document | What it fixes | Who asks for it | Ask the supplier for |
|---|---|---|---|---|
| International | ISO 10406-1:2025 ↗ | Test methods for FRP bars and grids: tension, bond, creep, alkali resistance, transverse shear and more. | Projects outside North America that need a neutral test basis; EU ETAs. | Reports that name the ISO clause tested; ISO methods do not by themselves certify conformity. |
| Market | Document | What it fixes | Who asks for it | Ask the supplier for |
|---|---|---|---|---|
| United States | ICC-ES AC454 / AC521 (ESR) ↗ | Acceptance criteria for GFRP bars in structural concrete (AC454) and flatwork shrinkage reinforcement (AC521); an ESR lists one producer's bars. | Building officials and residential/commercial engineers. | Only holders of a published ESR may claim it. Ask any supplier for the ESR number or a plain statement that none is held. |
| European Union | EAD 260023-00-0301 (ETA → CE) ↗ | European Assessment Document under which a producer obtains an ETA and may CE mark GFRP bars. | EU and UK (UKCA path) specifiers requiring CE marking. | The ETA number and Declaration of Performance; without them a bar is not CE marked. |
| Germany | DIBt general technical approval (e.g. Z-1.6-238) ↗ | National approval of a specific producer's bar system with design rules for German practice. | German building authorities and designers. | Approval number; only the named product and producer are covered. |
| Market | Document | What it fixes | Who asks for it | Ask the supplier for |
|---|---|---|---|---|
| United States | ACI SPEC-440.5-22 ↗ | Construction specification: submittals, storage, handling, placing tolerances and inspection for GFRP bars. | Specifiers writing Division 03 sections. | Handling and storage instructions and the cutting method for the offered bar. |
Status notes, October 2026: ASTM D7957/D7957M-26 is active and ACI CODE-440.11-22 still cites the 2022 edition; CSA S6:25 superseded S6:19 in October 2025; the reaffirmation status of CSA S806 differs between catalogues; GOST 31938-2022 superseded the 2012 edition. Confirm the edition your project names.
| Bar | Ø mm | Area mm² | Min. force kN | kip | MPa (nominal area) |
|---|---|---|---|---|---|
| No. 2 | 6.4 | 32 | 27 | 6.1 | 844 |
| No. 3 | 9.5 | 71 | 59 | 13.2 | 831 |
| No. 4 | 12.7 | 129 | 96 | 21.6 | 744 |
| No. 5 | 15.9 | 199 | 130 | 29.1 | 653 |
| No. 6 | 19.1 | 284 | 182 | 40.9 | 641 |
| No. 7 | 22.2 | 387 | 241 | 54.1 | 623 |
| No. 8 | 25.4 | 510 | 297 | 66.8 | 582 |
| No. 9 | 28.7 | 645 | 365 | 82.0 | 566 |
| No. 10 | 32.3 | 819 | 437 | 98.2 | 534 |
How to read a datasheet against this table. A producer’s guaranteed force or strength for each size should sit above the row here, with the laboratory, test method and edition stated. Leading structural bars publish 800 to 1,100 MPa guaranteed strength and 46 to 60 GPa modulus; a bar that only quotes an ultimate or mean value has not been qualified to the standard’s definition.
Area is measured, not assumed. Table 3 also fixes a measured cross-sectional area range for each size, so a sand coating or helical wrap cannot inflate the nominal area. Compare offers per certified area or per guaranteed force, as the cost-per-foot guide explains.
Bent bars are separate. The bent portion must reach 60% of the straight-bar force when tested to ASTM D7914; designers use the bent value for stirrups and hooks. Mesh is outside D7957 altogether.
Our GFRP rebar calculator applies the ACI 440.11 factors to a certificate’s values, and the size chart gives weights for every size.
| Property | Requirement | Test method | Why it matters |
|---|---|---|---|
| Tensile modulus | ≥ 44.8 GPa (6,500 ksi), mean | ASTM D7205/D7205M | Stiffness governs crack width and deflection; a quarter of steel's 200 GPa. |
| Ultimate tensile strain | ≥ 1.1%, mean | ASTM D7205/D7205M | Confirms the bar reaches its guaranteed load before rupture. |
| Guaranteed tensile force | Table 3 value by size (mean − 3σ); see the size table | ASTM D7205/D7205M | The number the engineer multiplies by C_E = 0.85 to design with. |
| Transverse shear strength | ≥ 131 MPa (19 ksi) | ASTM D7617/D7617M | Resists dowel action and cutting at cracks and construction joints. |
| Bond strength to concrete | ≥ 7.6 MPa (1,100 psi) | ASTM D7913/D7913M | Qualifies the sand coating, wrap or ribs that anchor the bar. |
| Bent-bar tensile strength | ≥ 60% of the straight-bar guaranteed load | ASTM D7914/D7914M | Stirrups and hooks lose capacity at the bend; design uses the bent value. |
| Fiber mass fraction | ≥ 70% by mass | ASTM D2584 or D3171 | Glass carries the load; low fiber content shows up as low modulus. |
| Moisture absorption | ≤ 0.25% at 24 h; ≤ 1.0% at saturation | ASTM D570 | Water uptake is the route for alkali attack on the glass. |
| Alkali resistance | ≥ 80% tensile strength retained after exposure | ASTM D7705/D7705M, Procedure A | Concrete pore water is highly alkaline; this is the durability screen. |
| Glass transition temperature | ≥ 100 °C | ASTM E1356 (DSC) or E1640 (DMA) | Sets the service-temperature margin of the vinyl ester matrix. |
| Degree of cure | ≥ 95% | ASTM E2160 (DSC) | Under-cured resin absorbs water and loses strength early. |
| Measured cross-sectional area | Within the size-specific range of Table 3 | ASTM D7205 Annex | Keeps the nominal area honest when a sand coat or wrap adds diameter. |
CSA S807 adds the modulus grades and durability classes above, AS 5204:2023 maps similar tests for Australia, and the Chinese GB/T 26743 and JG/T 406 grade bars by tensile strength and modulus for domestic projects. ASTM D8505 covers glass and basalt bars in the 60 GPa class; basalt bars need their own data, as the basalt vs fiberglass comparison explains.
AC454 covers bars in structural concrete under ACI 440.11; AC521 covers shrinkage and temperature reinforcement in flatwork. An ESR lists the producer, the plant, the sizes evaluated and the guaranteed values, and it requires ongoing factory inspections. Bends are usually outside the report's scope.
Florida, Texas, Ohio, Maine and others qualify production facilities through AASHTO NTPEP or FRP Institute audits and list them for contractors; shipments may be sampled and tested at the contractor's expense. Buy America rules have applied to GFRP on federally funded work since October 2025.
Grade and durability class come from CSA-protocol testing; Ontario additionally lists designated sources for its OPSS 1640 work, requiring Grade III, D1, E-CR glass and a vinyl ester or epoxy matrix.
CE marking follows a European Technical Assessment under EAD 260023-00-0301 and a Declaration of Performance; only a few GFRP bars hold one. Germany's DIBt issues general technical approvals for named systems, such as the one held by Schöck Combar.
Two modulus grades made by FengDu New Material, GFRP 45 (CSA S807 Grade I class) and GFRP 60 (Grade III class), with third-party test reports for the offered grade and sizes to ASTM D7205, D7617, D7913, D7705 and D7914 or the ISO 10406-1 equivalents, production-lot certificates traceable to the delivered bundles, bent-bar data for scheduled shapes, and a plain statement of which approvals are and are not held. We do not hold ICC-ES, DOT, CSA designated-source, ETA or DIBt listings, and we say so before a project relies on one. How the leading producers hold theirs is summarized in GFRP rebar manufacturers and how to qualify a supplier.
A product standard such as ASTM D7957 or CSA S807 says what any qualifying bar must achieve and how to test it. A design code such as ACI CODE-440.11-22 says how to use the bar. An approval or listing, such as an ICC-ES report, a DOT producer list, a DIBt approval or a European ETA, names one producer's bar after an audit. Only the named producer may claim it.
The one named in the project specification. ASTM D7957/D7957M-26 is the active edition; ACI CODE-440.11-22 was written around the 2022 edition and the Gulf standards body adopted the 2022 edition in 2025. Qualification reports should state the edition they were run against, and a newer ASTM edition does not update an older report by itself.
Modulus tiers: Grade I is at least 40 GPa, Grade II at least 50 GPa and Grade III at least 60 GPa, with durability classes D1 and D2 from alkali exposure testing. Ontario's OPSS 1640 requires Grade III, D1, E-CR glass and a vinyl ester or epoxy matrix. ASTM D7957 has a single 44.8 GPa minimum, and ASTM D8505 covers the 60 GPa class for glass and basalt bars.
No. Annex R is an informative design annex for embedded FRP reinforcement, used where a national annex allows it. CE marking of a bar runs through a European Technical Assessment under EAD 260023-00-0301 and a Declaration of Performance; Germany additionally uses DIBt general technical approvals for named products.
Test methods for FRP bars and grids: tension, bond, creep, alkali resistance, transverse shear and more. It is the neutral test basis for projects outside North America and the methods behind European assessments. A report to ISO 10406-1 shows how values were measured; it does not by itself certify conformity to any product standard.
Three layers with editions: the product standard (ASTM D7957/D7957M-26 or CSA S807:19), the design code the engineer used (ACI CODE-440.11-22, AASHTO GFRP-2, CSA S806 or S6, EN 1992-1-1:2023 Annex R, AS 5204 with the state agency clauses) and the submittals: a qualification report for each size, production-lot certificates and bent-bar data. The specification guide shows the wording.
Send the specification clause and the submittal list. We confirm the evidence available for the offered grade and identify any further testing before supply. We reply within one business day.