What we have learned running the line.
Notes on making GFRP rebar in India — process, standards, and things that only show up once a plant is running.
Line controls · PithampurEpoxy, vinyl ester or polyester: which resin should a GFRP rebar line run?
The resin binds the glass, shields it from concrete pore water and sets the bar's heat limit, so the choice between epoxy, vinyl ester and polyester shapes durability, process control and what the line has to be built to handle.
28 Sept 2026Degree of cure and Tg: the two lab numbers that show whether a GFRP bar was cured properly
Degree of cure and glass transition temperature, both measured by DSC on a few milligrams of bar, are the most direct evidence of whether a pultrusion line's die and curing section actually did their job — and they are cheap enough to test on every batch.
22 Sept 2026Why so many GFRP rebar manufacturers struggle — and it usually traces back to the machine
A cheap or undersized production line does not lower your overheads, only your output, which means the same fixed costs land on far fewer kilograms and you are underpriced in the market before your first sale.
21 Sept 2026Fibre sizing: the coating nobody asks about that decides if GFRP rebar survives concrete
Glass fibre arrives at the pultrusion line already coated with a chemical layer a few molecules thick, and that layer — not the glass grade alone — decides whether the bar holds its strength inside alkaline concrete for decades.
19 Sept 2026What actually decides whether a GFRP rebar line makes money in India
The brochure lists diameter range and bars per run — the numbers that decide whether the plant pays for itself are six operating factors the brochure never mentions.
12 Sept 2026IS 18256:2023: what it actually requires from your production line
A plain read of India's GFRP rebar standard and the stations on a production line that decide whether your bar can pass it.
25 Aug 2026How GFRP rebar is actually made
A walk down the line from creel to cut, and what goes wrong at each station.