Filament Winding Grade Resin
SPR 301 FWNon-thixotropic isophthalic grade for filament windingSPR 301 · Isophthalic Polyester Resins
Isophthalic grade with high binding properties and high strength, for the filament winding process.
Review the official product data sheet for specifications and application information.
Price
Price on Request
Industrial resin pricing varies based on:
- Order Quantity
- Resin Grade
- Current Raw Material Rates
Product details
| Catalogue Code | SPR 301 FW |
|---|---|
| Resin Chemistry | Isophthalic unsaturated polyester |
| Supply Condition | Non-accelerated · non-thixotropic |
| Reference Cure System | MEKP 1.5% + Cobalt Octoate approximately 0.4% — added separately during use |
Typical specification
| Appearance | Clear, light-yellow to amber liquid |
|---|---|
| Viscosity | 200–400 cPs at 25 °C |
| Gel Time | 20–60+ minutes at 25 °C |
| Specific Gravity | 1.04–1.14 |
| Styrene Content | 35–45% by weight |
Typical values from the Samrat Poly Resins product catalogue, 2026 edition. They are not guaranteed specifications or finished-component properties; confirm the current values for your order and trial the grade on your own process.
SPR 301 FW is an isophthalic polyester grade from the SPR 301 family with high binding properties and high strength, per the catalogue, for the filament winding process — including filament-wound FRP pipes and tanks. It is supplied non-accelerated and non-thixotropic, with MEKP and cobalt octoate added separately during use.
Where a wound pipe or tank faces corrosive or chemical service beyond the isophthalic route, compare Vinyl Ester Resin (SPR 501 VE) and its filament-winding guide.
Key features
- Isophthalic filament-winding grade (SPR 301 FW)
- High binding properties and high strength, per the catalogue
- Typical viscosity 200–400 cPs; gel time 20–60+ minutes at 25 °C
- Supplied non-accelerated and non-thixotropic
Applications
- Filament-winding processes
- Filament-wound FRP pipes and tanks
Product role
Filament winding draws continuous roving through a resin bath and onto a rotating mandrel, so the resin has to wet the roving quickly and stay workable for the length of the wind. The catalogue lists SPR 301 FW as a non-thixotropic isophthalic grade for wound pipes and tanks, with a long gel-time window of 20 to 60+ minutes at 25 °C.
Winding speed, bath temperature, mandrel size and the laminate schedule set the working window actually needed. Trial the grade on the winding line before production.
Supply and cure
- Supply condition
- Non-accelerated · non-thixotropic
- Reference cure system
- MEKP 1.5% + Cobalt Octoate approximately 0.4% — added separately during use
Processes and where this grade fits
SPR 301 FW is a non-thixotropic isophthalic grade for filament winding, where roving is wetted in a bath and wound onto a rotating mandrel.
| Process or use | Role of this grade | What to confirm |
|---|---|---|
| Filament winding of FRP pipes | Listed role | Pipe diameter, wind pattern, bath temperature and the working window for the full wind |
| Filament winding of FRP tanks | Listed role | Tank size, the liner or corrosion barrier and any governing specification |
| Pultrusion | Different process — consider SPR 401 PT | Pultrusion cures in a heated die and needs a heat-activated cure system |
| Hand-laid linings | Consider SPR 301 OT or SPR 301 OS | The lining grades listed for oil and solvent storage |
| Winding for more corrosive service | Consider vinyl ester | SPR 501 VE, Vinyl Ester Resin |
Process-selection considerations
- Match the working window to the wind. The typical gel time of 20–60+ minutes at 25 °C has to cover wet-out, the full wind and consolidation on the mandrel.
- At 200–400 cPs typical and non-thixotropic, the grade wets roving quickly in the bath. Check drip and run-off at your line speed.
- Separate the structural wall from the corrosion barrier. The inner liner facing the medium may need a different resin from the structural winding.
- Share the pipe or tank specification, the medium it will carry and the operating temperature.
- Reference cure: MEKP 1.5% with cobalt octoate approximately 0.4%, added separately.
Limitations and trial requirements
- No cured mechanical, heat or chemical-resistance data are published for SPR 301 FW. Pipe and tank ratings belong to the tested product.
- Bath life on a real line depends on temperature, bath size and turnover as much as on the resin.
- The grade is not a vinyl ester; for services that call for vinyl ester the structural decision changes.
- Trial the grade on the real part, mould and shop conditions before production. The catalogue values are typical liquid-resin properties, not guaranteed limits or finished-part performance.
Before you select this grade
- The values on this page are typical. Final selection should be confirmed against your own process, a trial result and the current technical documentation for the grade.
- The Technical Data Sheet linked on this page carries these same typical values. No Safety Data Sheet is published on this site for this grade; request current safety information before use.
- Never mix a concentrated peroxide initiator directly with a cobalt accelerator. Add each to the resin separately, according to the confirmed process.
- Store resin, initiators and accelerators separately, in original sealed containers, cool, shaded and away from heat and ignition sources. Use suitable personal protective equipment and adequate ventilation.
