Two Corrosion-Resistant Options
| Property | GFRP Rebar | Stainless Steel 316L |
|---|---|---|
| Corrosion resistance | Complete immunity | Very high (not absolute) |
| Tensile strength | 1000–1200 MPa | 500–700 MPa |
| Weight | ~2.1 g/cm³ | ~7.9 g/cm³ |
| Price in India | ₹175–270/kg | ₹600–900/kg |
| Availability | Good — domestic | Limited — mostly imported |
| On-site bending | Not possible | Possible |
| Non-magnetic | Yes | 316L only |
| Non-conductive | Yes | No |
| BIS standard | IS 18256:2023 | None |
When to Choose GFRP
- Non-conductivity required (MRI, electrical zones)
- Complete non-magnetic properties needed
- Budget is a constraint — GFRP is 3–5x cheaper per kg
- Domestic supply matters — manufactured in Surat
When to Consider Stainless Steel
- Complex on-site bending required
- Standard steel design rules must apply
- Ductility required (seismic columns)
The Cost Reality
On a per-metre basis for equivalent reinforcement, stainless steel is approximately 12–15x more expensive than GFRP. For most corrosion-critical applications, GFRP wins clearly.
RN Elements manufactures GFRP in Surat. Available in 3–5 days for standard diameters.
Frequently Asked Questions
GFRP has higher tensile strength (1000–1200 MPa vs 500–550 MPa for Fe500 TMT) but lower stiffness. It must be designed differently, particularly for deflection. For slabs and walls, GFRP outperforms steel.
No. All bent bars (stirrups, hooks, L-bars) must be factory-fabricated. Straight bars can be cut with an angle grinder on site.
Yes. IS 18256:2023 is India's BIS national standard for GFRP rebar. RN Elements supplies NABL-accredited test certificates with every order.
GFRP rebar is approximately 75% lighter than steel. 8mm GFRP weighs about 0.104 kg/m vs 0.395 kg/m for 8mm TMT, reducing freight costs significantly.