Sulfibra Compósitos




Gels and Pigments



Gels are made with resins, usually orthophthalic or isophthalic polyesters. Its general formulation is polyester resin, thixotropic agent and U.V. absorbers, pigments, mineral filler, styrene monometer and cobalt accelerator.

Basic functions:
• Protection against sun rays and bad weather.
• Colorful, decorative, and glossy finishing.
• Protection against fire and chemical aggressions.
• Base for painting.


Orthophthalic Gelcoat
Common gel that does not have as defined characteristics as isophthalic gelcoat. Special for painting reinforced plastic pieces that do not require much resistance to abrasion and are not exposed to bad weather.

Isophthalic Gelcoat
All types of Isophthalic Gelcoats are produced with high quality isophthalic polyester resins. Isophthalic resins in general have physical and chemical resistance that are naturally superior to orthophthalic resins, thus generating a superior Gelcoat with a longer lasting shine. As with Orthophthalic, Isophthalic Gelcoats also have a specific formulation for each purpose with additives that optimize their desired characteristics. The entire isophthalic line also contains in its formulation a specific UV ray inhibiting filter.

ISO/NPG Gel
ISO NPG Gel is a product based on isophthalic polyester resins with neopentyl glycol, styrene monomer, mineral fillers, thixotropic agents, pigments, and additives. It is pre-accelerated and has medium viscosity. Used in the manufacture of pieces and products that need high weather resistance and that have excessive contact with water, working as a chemical barrier. Pieces that need a superior finish with High Gloss, excellent physical and chemical resistance, UV resistance and High Fidelity in colors after curing.

Ester Vinyl Gel
Specially developed to meet the requirements of high chemical resistance while maintaining the same aesthetic characteristics as a conventional gelcoat. Widely used in chemical industries and in the manufacture of equipment bound to aggressive media, both acids and bases. Particularly for manufacturing or coating equipment with chemical attacks.

Mold Gel
A mold made from fiberglass must be highly reinforced to resist various types of twisting and the normal contractions that occur during the manufacture of a piece. This contraction occurs during the curing process, where the polyester resin tends to shrink. This shrinkage according to the shape of this piece causes a tendency for a certain curvature to close even more. If the mold is not strong enough, it will deform simultaneously generating an out of measure part. To prevent this from happening, a mold has numerous reinforcements, and its wall has a much greater thickness than the part to be generated by it. This will entail a high cost in its manufacture, justifying the use of a specific Gelcoat. The Gelcoat used will have to withstand the severe treatment that a mold undergoes throughout its life. The surface of a part generated in a mold will be an exact copy in terms of finishing: Any defect that the mold presents will be transferred to the piece. If a mold shines, the piece will come out shiny; if a mold is opaque, the piece will be opaque as well. Therefore, the need to use a Gelcoat that maintains maximum shine, even in direct contact with various types of products; that has a good resistance to abrasion, impacts, twists, in short, that prolongs the life of the mold.

Pigment for Polyester (Paste)
Pigment of lower concentration with direct compatibility with polyester resins and medium compatibility with polyurethane and epoxy. Its excessive use in resin inhibits its curing.




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