Fiberglass resin
FRP Resin Manufacturer in India
FRP resin, also called fiberglass resin, is the liquid thermoset that binds glass fibre into a fibre-reinforced plastic part. It is a trade name, not one chemistry. A water tank, a chemical lining, a roofing sheet and a pultruded profile each start from a different grade.
Samrat Poly Resins manufactures polyester resins at Doraha, Punjab, in orthophthalic (GP), isophthalic (ISO), terephthalic and fire-retardant grades, and also offers vinyl ester resin. Find your job below, then open the grade and its data sheet.
Which FRP resin for which job
Typical values from each grade's published data sheet, for shortlisting. Confirm the grade on a trial of the real part.
| Grade | Viscosity | Gel time | Data sheet |
|---|---|---|---|
| General hand lay-up and spray-upThe usual starting point for FRP mouldings with no water, chemical or fire demand. | |||
| GP Clear ResinSPR 201 GPC | 350–450 cPs | < 8 minutes | TDS |
| Unsaturated Polyester Resin | 350–450 cPs | < 8 minutes | TDS |
| Coloured FRP sheets and panelsPre-pigmented yellow resin for consistent sheet colour. | |||
| Sheet Grade Yellow ResinSPR 201 SGY | 280 cPs | 6.5 Minutes | TDS |
| Roof-light and skylight sheetsChoose the UV-stabilized grade where the sheet faces sunlight. | |||
| Roof Light Sheet Grade ResinSPR 201 RL | 280 cPs | 6.5 Minutes | TDS |
| UV-Stabilized Roof Light ResinSPR 201 RL (UV) | 200–400 cPs | 6.5–10 minutes | TDS |
| Door-skin and plywood laminationTransparent orthophthalic resin for lamination. | |||
| Lamination Resin (LR Resin) | 400 cPs | 5 Minutes | TDS |
| Cooling towers and large vertical lay-upThixotropic grades that resist sag. Move to the isophthalic grade for heat, chemical or corrosion service. | |||
| Orthophthalic Cooling Tower Grade ResinSPR 201 CTG | 350–450 cPs | Under 8 minutes | TDS |
| Isophthalic Cooling Tower Grade ResinSPR 301 CT | 400–650 cPs | 15–35 minutes at 25 °C | TDS |
| Tanks and laminates in water or chemical serviceThe general isophthalic grade for water immersion and chemical-service laminates. | |||
| ISO Polyester ResinSPR 301 | 500 cPs (mPa·s) at 25 °C | 15 minutes at 25 °C | TDS |
| Oil-storage tank liningsIsophthalic grade listed for oil-storage linings and chemical equipment. | |||
| Oil Storage Tank Grade ResinSPR 301 OT | 300–600 cPs at 25 °C | 15–35 minutes at 25 °C | TDS |
| Solvent storage, sewage and effluent equipmentAnti-corrosive isophthalic grade for organic-solvent linings and effluent service. | |||
| Organic Solvent-Resistant Grade ResinSPR 301 OS | 200–400 cPs at 25 °C | 15–35 minutes at 25 °C | TDS |
| More corrosive service, or a specification that names vinyl esterBisphenol-A epoxy vinyl ester, with room-temperature MEKP cure. | |||
| Vinyl Ester ResinSPR 501 VE | 350 cPs (at 25°C) | See data sheet | TDS |
| Filament-wound pipes and tanksIsophthalic grade for the filament-winding process. | |||
| Filament Winding Grade ResinSPR 301 FW | 200–400 cPs at 25 °C | 20–60+ minutes at 25 °C | TDS |
| Pultruded profilesCured in the heated die with a heat-activated peroxide blend, not with ambient MEKP and cobalt. | |||
| Pultrusion Grade ResinSPR 401 PT | 300–600 cPs at 25 °C | See data sheet | TDS |
| SMC and DMC moulding compoundsChoose the family by the chemistry the compound needs. | |||
| DMC/SMC ResinSPR 201 SMC · DMC | 600 cPs (at 25°C) | See data sheet | TDS |
| Isophthalic SMC ResinSPR 301 SMC | 800–1,400 cPs at 25 °C | 12–18 minutes at 25 °C | TDS |
| Isophthalic DMC ResinSPR 301 DMC | 800–1,400 cPs at 25 °C | 12–18 minutes at 25 °C | TDS |
| Terephthalic SMC ResinSPR 401 SMC | 800–1,500 cPs at 25 °C | See data sheet | TDS |
| Terephthalic DMC ResinSPR 401 DMC | 1,200–2,200 cPs at 25 °C | See data sheet | TDS |
| A stated fire requirementHalogenated and halogen-free routes. No certified rating applies unless a test result is supplied. | |||
| Fire Retardant ResinSPR 201 FR | 400 cPs | 5.5 Minutes | TDS |
| Halogen-Free Fire-Retardant ResinSPR 201 FR (HF) | 1,500–3,500 cPs at 25 °C | 15–30 minutes at 25 °C | TDS |
| ISO Fire Retardant ResinSPR 301 FR | 400 cPs | 5.5 minutes | TDS |
| Mould-face surface coatUse the isophthalic gelcoat where the surface faces weathering or water. | |||
| GP Gelcoat ResinSPR 201 GC | 11,000 cPs | 8.5 Minutes | TDS |
| ISO GelcoatSPR 301 GC | 40,000 cPs at 25 °C | 8 minutes at 25 °C | TDS |
| Composite moulds and toolingIsophthalic NPG-based resin for mould production. | |||
| Tooling Grade ResinSPR 401 TL | 400–650 cPs | 15–30 minutes at 25 °C | TDS |
GP, ISO or vinyl ester?
GP resin (orthophthalic)
The general-purpose FRP resin, used for hand lay-up, spray-up, sheets and everyday mouldings. See the GP resin grades.
ISO resin (isophthalic)
Specified where a laminate faces water immersion, chemical service or sustained outdoor conditions. Here ISO means the chemistry, not a certificate. See the isophthalic resin grades.
Vinyl ester resin
The route where service is more corrosive or the specification names it. It processes like a polyester, with room-temperature MEKP cure. See vinyl ester resins.
A family and a grade are a starting point. Corrosion resistance depends on the medium, its concentration and temperature, and the laminate construction, so no grade is a universal compatibility chart. Typical values are not guaranteed properties of a finished part.
Fiberglass resin and hardener: what to order together
"Fiberglass resin and hardener" means different things for the two resin types. Order the curing components that match the resin, in the amount its data sheet prints.
Polyester and vinyl ester resin
These cure with MEKP hardener as the catalyst and, for most grades, a cobalt octoate accelerator. GP Clear Resin and Lamination Resin, for example, print 1.5% MEKP and 0.4% cobalt on their data sheets. The dosage table lists every grade's printed values and gel time.
Epoxy resin
Epoxy does not use MEKP. Fiberglass Epoxy Resin cures with an amine hardener at 2:1 by weight, so ask for the complete resin-and-hardener system when you enquire. Our separate Epoxy Hardener page explains how to confirm a pairing.
Either way, add glass fibre mat as the reinforcement. Tell us the resin grade and your monthly quantity, and we quote the resin and its curing components together.
Questions buyers ask
What is the price of FRP resin per kg?
We do not publish a price per kg. Each order is quoted against grade, quantity, packing and delivery location. Tell us those four things and we will quote for your order. How ordering works.
What should I send for a quotation?
The grade or the part you make, your process, the quantity and your delivery location. For chemical service, add the medium, its concentration and the operating temperature.
What is the minimum order and packing?
Both differ by grade. Where they are published, you will find them on that grade's product page.
Where are the TDS and MSDS?
Every grade above links to its Technical Data Sheet. Safety Data Sheets, where issued, are on the product page and in the document library.
Can I buy hardener, cobalt and glass mat with the resin?
Yes. See hardeners and accelerators and FRP allied products, including chopped strand mat and pigment.
Ask for the right FRP resin
Not sure of the grade? Describe the part and we will suggest one with its data sheet. Buying for resale? See dealer and distributor enquiries.