GFRP vs TMT steel
GFRP Rebar vs TMT Steel Rebar
GFRP rebar has roughly 2x the tensile strength of TMT steel by weight, is about 4x lighter, and does not corrode — no rust staining, no chloride-driven spalling, no theft value for scrap. TMT steel still has a higher modulus of elasticity and remains the more conventionally specified option for deflection-sensitive designs. Below is the full spec-by-spec comparison.
RebarXGFRPTMT Steel RebarWhy RebarX Outperforms
Corrosion Free, Double Tensile Strength, Cost Savings
- Direct Cost Savings in Material, Labour & Time
- Quicker Construction
- No worries of Cracks in construction in a few years
- Better Thermal insulation of construction
- Better for Vastu
Frequently asked questions
By tensile strength, yes — GFRP rebar has roughly twice the tensile strength of Fe500 TMT steel, weight for weight. TMT steel still has higher stiffness (modulus of elasticity), which is why design codes size GFRP reinforcement differently rather than swapping it in at a 1:1 bar count.
No. GFRP rebar is a glass-fibre-reinforced polymer with no iron content, so it has no corrosion mechanism at all — no rust staining, no spalling from expanding rust, and no chloride-induced corrosion in marine or water-contact structures.
For structures needing high stiffness under service loads with minimal deflection, or where local codes and consultants haven't yet approved GFRP for that specific application, TMT steel remains the conventional, more broadly specified choice. RebarX is upfront about this rather than positioning GFRP as a universal replacement.
Per-kg pricing is typically higher than TMT steel, but GFRP's lower weight (about 4x lighter) reduces transport and handling cost, and eliminating corrosion removes a major long-term maintenance and repair cost that steel-reinforced structures carry over their service life.
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