Question 1

What is GFRP rebar?

Accepted Answer

GFRP (glass fibre reinforced polymer) rebar is a composite reinforcing bar made from continuous E-glass fibres bound in a thermoset resin such as vinyl ester or epoxy. It is used instead of steel rebar in concrete, especially where corrosion is a concern. It is also called fibreglass rebar or a glass fibre rod.

Question 2

What is fibreglass rebar?

Accepted Answer

Fibreglass rebar and FRP rebar are everyday names for GFRP rebar: a ribbed glass-fibre bar, not TMT. Trumbak FiberMech makes it from 6 mm to 25 mm at Changodar, Ahmedabad. It does not rust. It is also not a silent substitute for every steel detail.

Question 3

Is GFRP rebar a plastic rod?

Accepted Answer

No. GFRP is continuous glass fibre in a cured resin, with a rib so concrete can bond. A plain plastic rod is a different product. Do not place an unmarked plastic rod where a drawing asks for reinforcement.

Question 4

What is the full form of GFRP?

Accepted Answer

Glass fibre reinforced polymer. The long form used on some specifications is glass fiber reinforced polymer rebar. FRP is the wider family. Our bar is glass, not basalt and not carbon.

Question 5

Is fiberglass rebar stronger than steel?

Accepted Answer

Along the bar, GFRP tensile strength is high, and the bar does not rust. It is less stiff than steel, and it does not yield. A member drawn for TMT can deflect or crack too much if someone swaps the bar without an FRP design. One lab number is not the whole member.

Question 6

What are the disadvantages of GFRP rebar?

Accepted Answer

Lower stiffness than steel, no yield plateau, and no bending on site. Crews cut it with a blade, not a shear. Fire, bond and development length follow FRP rules, not IS 456 habit. Those limits are why the drawing has to be designed for GFRP.

Question 7

How long does GFRP rebar last?

Accepted Answer

The bar has no rust mechanism, so it does not fail the way TMT fails in salt and constant moisture. We do not print a year count or a 100-year claim. How long the concrete lasts is still the engineer’s design, cover and exposure.

Question 8

What sizes does Trumbak FiberMech manufacture?

Accepted Answer

Ribbed GFRP rebar in 6, 8, 10, 12, 16, 20 and 25 mm. 6 mm and 8 mm are available in coils up to 100 m. All sizes are available as straight bars up to 12 m. A 10 mm bar is 0.175 kg per metre. A 12 mm bar is 0.250 kg per metre.

Question 9

Do you publish a price per kilogram?

Accepted Answer

No public rate card, and no price list that pretends to be today’s market. A per-kg rate and a per-metre rate are different because each diameter has its own weight. Send the diameter, metres or kilograms, the project type and the delivery city. We reply from Ahmedabad.

Question 10

How is GFRP rebar different from steel (TMT) rebar?

Accepted Answer

GFRP rebar does not rust, weighs about one-quarter as much as steel, and is non-magnetic and electrically non-conductive. Tensile strength is high along the bar, but stiffness and design rules differ from TMT. It is not a silent swap in every detail. The comparison page sets this out row by row.

Question 11

Can GFRP rebar be used in a house, roof slab or boundary wall?

Accepted Answer

Only when the drawing is designed for GFRP. A house slab, roof or boundary wall already detailed as TMT is not a silent swap. It is easier to justify in a damp slab, a coastal house, a water tank, a septic tank or a compound wall that stays wet. The structural engineer has to accept the design.

Question 12

Where is GFRP rebar used?

Accepted Answer

Seawalls, jetties and ports, bridge decks and flyovers, metro tunnels and stations, STP and WTP tanks, reservoirs, canals, swimming pools, and chemical and industrial floors. Fencing and a farm compound are possible only if the engineer designs those bars as GFRP.

Question 13

Where do I get GFRP rebar in Ahmedabad?

Accepted Answer

From our own factory: Shed No. 8, Plot No. 28/29, Ashwamegh Industrial Estate, Ahmedabad–Rajkot Highway, Changodar, Ahmedabad 382213, Gujarat. We dispatch across Gujarat, including towards Rajkot, Vadodara and Surat, and to sites elsewhere in India. We do not pretend to have a shop in every city.

Question 14

Where is the factory?

Accepted Answer

Shed No. 8, Plot No. 28/29, Ashwamegh Industrial Estate, Ahmedabad–Rajkot Highway, Changodar, Ahmedabad 382213, Gujarat. This is the plant that makes the bar. Supply is across Gujarat and India.

Question 15

How do I get a price quote?

Accepted Answer

Send diameters, quantity in metres or kg, project type and delivery location through the quote form, WhatsApp or email. The Ahmedabad team replies with price and availability. Phone +91 82388 00961.

Question 16

Can GFRP rebar be bent on site?

Accepted Answer

No. GFRP does not yield like TMT. Bending it on a pin damages the fibres. Hooks and stirrups have to be agreed before production, or the detail stays with straight bars.

Question 17

How do you cut GFRP rebar?

Accepted Answer

With a diamond or abrasive cutoff wheel, not a rebar shear and not a torch. Cutting makes glass dust, so crews need a mask, eye protection and gloves. The cutting guide on this site has the short version.

Question 18

Which Indian standard covers GFRP rebar?

Accepted Answer

IS 18256:2023 is the material specification. IS 18255 covers test methods. For roads and bridges, consultants use IRC:137-2022. Trumbak does not print a BIS licence number on this website. Ask us what documents we can attach to your enquiry.

Question 19

Do you supply Gujarat and the rest of India?

Accepted Answer

Yes. The only factory is in Changodar, Ahmedabad, on the Ahmedabad–Rajkot highway. We do not manufacture in other cities. We dispatch from that plant across Gujarat and to project sites elsewhere in India.

Questions before you specify the bar.