Orthophthalic Fire-Retardant Gelcoat Resin data sheet (PDF)Ask for a quote
The surface is where a fire starts
In a moulded FRP part, the gelcoat is applied to the mould first and becomes the outer skin of the finished part. It is the layer that meets weather, cleaning, wear — and, in a fire, the flame. A fire-retardant laminate hidden behind an ordinary gelcoat still presents a combustible surface.
That is why fire-retardant FRP systems pair a fire-retardant laminating resin with a fire-retardant gelcoat, and why Samrat Poly Resins’ 2026 catalogue lists SPR 201 FR-GC as the fire-retardant gelcoat of the orthophthalic SPR 201 series.
What makes it a gelcoat
Gelcoats are thicker and more thixotropic than laminating resins, and lower in styrene. SPR 201 FR-GC’s typical figures show that: viscosity of 5,000–11,000 cPs at high shear and 30,000–45,000 cPs at low shear, both at 25 °C, and styrene of 17–25% by weight. The large difference between the two viscosities is what lets a gelcoat spray or brush smoothly and then stay put as an even film on a vertical mould face.
It is supplied non-accelerated and thixotropic, milky white to grey, with custom-tinted variants where supplied. The catalogue’s reference cure is MEKP at 1.5–2.0%, with a typical gel time of 9–16 minutes at 25 °C.
Rail, metro and automotive components
The catalogue lists rail and metro composite components, automotive FRP components and the surface gelcoat of fire-retardant FRP laminates. Interior and exterior panels, cab mouldings and covers are typical of the parts where a fire requirement and a moulded finish meet.
Those sectors usually work to named fire standards. The standard, the classification sought and the construction of the part are the facts that decide whether this gelcoat is suitable — they should come with the enquiry.
The rating belongs to the tested build
No fire classification is published for SPR 201 FR-GC, and none could honestly be quoted for a gelcoat alone. Fire tests classify a specimen: gelcoat, laminate, thickness and sometimes core, together. Change one and the result can change.
Practically, that means the gelcoat, the fire-retardant laminating resin and the construction are selected and tested as a system. The fire-retardant gelcoat surfaces guide walks through that process.