Halogen-Free Fire-Retardant Resin
SPR 201 FR (HF)Halogen-free orthophthalic fire-retardant laminating resinSPR 201 · Orthophthalic Polyester Resins
Halogen-free orthophthalic fire-retardant resin for FRP laminates specifying halogen-free fire retardancy.
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 201 FR (HF) |
|---|---|
| Resin Chemistry | Orthophthalic unsaturated polyester, halogen-free fire-retardant |
| Supply Condition | Non-accelerated |
| Reference Cure System | MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use |
Typical specification
| Appearance | White to light-yellow opaque liquid |
|---|---|
| Viscosity | 1,500–3,500 cPs at 25 °C |
| Gel Time | 15–30 minutes at 25 °C |
| Specific Gravity | 1.25–1.45 |
| Styrene Content | 30–40% |
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 201 FR (HF) is the halogen-free fire-retardant grade of the orthophthalic SPR 201 family, listed for halogen-free fire-retardant FRP laminates, marine composite components and applications specifying halogen-free fire retardancy. It is supplied non-accelerated and cured with MEKP and cobalt octoate added separately during use. No fire classification or test result is published for this grade.
The SPR 201 family also has a halogenated grade, Fire Retardant Resin (SPR 201 FR). Where the specification calls for isophthalic chemistry as well as halogen-free fire retardancy, the catalogue lists ISO Fire Retardant Resin (SPR 301 FR).
Key features
- Halogen-free orthophthalic fire-retardant grade (SPR 201 FR (HF))
- Typical viscosity 1,500–3,500 cPs and gel time 15–30 minutes at 25 °C
- Typical specific gravity 1.25–1.45
- Supplied non-accelerated; MEKP and cobalt octoate added during use
Applications
- Halogen-free fire-retardant FRP laminates
- Marine composite components
- Applications specifying halogen-free fire retardancy
Product role
Some rail, marine and building specifications restrict halogenated flame retardants, which is why the catalogue lists a halogen-free grade alongside the halogenated SPR 201 FR. Its higher viscosity and specific gravity reflect a filled, opaque grade rather than a clear laminating resin.
Fire-retardant describes the resin's formulation. It does not certify a finished part: fire classifications belong to a tested laminate or component of a stated construction, thickness and test method. Share the exact standard or classification the project names so the grade can be discussed against it.
Supply and cure
- Supply condition
- Non-accelerated
- Reference cure system
- MEKP 1.5% + Cobalt Octoate 0.4% — added separately during use
Processes and where this grade fits
SPR 201 FR (HF) is a fire-retardant laminating resin. It is used to build the laminate behind a fire-retardant gelcoat, where the specification restricts halogenated flame retardants.
| Process or use | Role of this grade | What to confirm |
|---|---|---|
| Hand lay-up of fire-retardant FRP laminates | Listed role | Wet-out at 1,500–3,500 cPs, glass content and how the filled resin behaves on the chosen reinforcement |
| Marine composite components | Listed role | The component, the governing marine requirement and the full laminate construction |
| Rail, metro and building parts with a halogen-free requirement | Listed role — halogen-free specifications | The named fire standard and classification for the finished part |
| Surface coat of a fire-retardant part | Use a fire-retardant gelcoat | SPR 201 FR-GC or SPR 401 FRGC |
| Parts where halogenated FR is acceptable | Consider SPR 201 FR | The halogenated Fire Retardant Resin |
Process-selection considerations
- Begin with the specification. Choose the halogen-free grade when the project names a halogen-free requirement, not as a default upgrade.
- Name the standard and classification the finished part must meet. Fire performance is proven on a tested construction, so the grade can only be discussed against the real requirement.
- Plan for a filled, higher-viscosity resin. At 1,500–3,500 cPs and specific gravity 1.25–1.45, it wets out differently from a clear laminating resin; trial the reinforcement you will use.
- Keep the system consistent: the gelcoat, laminating resin and any core are all part of the tested part.
- The reference cure is MEKP 1.5% with cobalt octoate 0.4%, added separately. Gel time is 15–30 minutes at 25 °C typical, so plan stages to that window.
Limitations and trial requirements
- No fire classification, oxygen index, smoke or toxicity result is published for SPR 201 FR (HF). The resin is formulated to be fire-retardant; a rating belongs to a tested finished construction.
- The catalogue does not publish mechanical, heat or chemical values for this grade.
- It is an opaque, white to light-yellow resin, so it is not suitable where a clear or translucent laminate is required.
- 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.
