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Resins

Castro Composites focuses on most of the important thermosetting resins for composite applications. We offer resins for hand lay-up, spray-up, infusion, RTM, RTM light, pultrusion, etc.

Thermosetting resins are polymers that react thanks to the addition of a catalyst or a hardener causing an exotherm reaction. This reaction can also be boosted b...

Castro Composites focuses on most of the important thermosetting resins for composite applications. We offer resins for hand lay-up, spray-up, infusion, RTM, RTM light, pultrusion, etc.

Thermosetting resins are polymers that react thanks to the addition of a catalyst or a hardener causing an exotherm reaction. This reaction can also be boosted by UV or IR radiations or just by a source of heat.

Composite laminates are a combination of fibre reinforcement and resin. Once cured, these finished parts are primarily fiber dominant, meaning their physical properties most resemble those of the reinforcement used. So what role does resin play? It serves two basic purposes:

The matrix bonds the fibres of reinforcement together and helps it conform to a desired shape.
Resin also helps to transfer mechanical loads from the fibers of reinforcement to the entire composite part.

The resin also determines the thermal limit of the composite part. It is very important to know what is the Tg (Glass Transition Temperature) or HDT (Heat Distortion Temperature) of the resin in order to know what will be the heat resistance of the part.

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Resins  There are 57 products.

Subcategories

  • Epoxy

    Types of epoxy resins

    Glycidyl ester resins: for electrical insulation, vacuum impregnation, laminations, for casting and high weatherability parts.

    Glycidylamine resins: for parts which must retain their mechanical properties at high temperatures, resistant to nuclear radiation, wet lamination.

    Brominated resins: for fire resistant parts.

    Properties

    Excellent mechanical properties.

    Strong adhesion to almost all materials.

    Low shrinkage on cure (1-2%) Thermostability.

    High chemical resistance.

    Abrasion resistance.

    Good electrical properties.

    Reduced water absorption.

    At high temperature it shows a decrease of mechanical properties.

    From 300 °C it begins to burn.

    Applications

    Mortar and polymer concrete.

    Injection resins.

    Adhesives.

    Manufacture of tools and moulds.

    Fiber reinforced plastics: wind blades, boats, vehicle bodies, etc.

    Paintings.

    Casting resins for the electrical sector.

  • Polyester

    Main Polyester resins in the market

    Orthophthalic (ORTHO): are the cheapest and the most used but with the most limited properties.

    Isophthalic (ISO): more expensive, better performance and with better mechanical and chemical properties, also very used, especially in nautical applications.

    DCPD (Dicyclopentadiene): intermediate price. Widely used for multiple applications. Intermediate properties.

    Envirotec polyester resins in aqueous emulsion: polyester resins with lower styrene content (23-25%) known as green resins.

    Features

    Polyester resins are cheap and very easy to process.

    Low glass transition temperature (Tg)

    They contain volatile monomers.

    They show contraction.

    Maximum working temperature of approximately 130 ° C.

    Applications

    Manufacture of flat and corrugated sheets.

    Manufacture of toilets, bathtubs, shower trays.

    Bus and truck bodies.

    Sports boats.

    Windmills blades.

    Castings for imitation of marble, stone, etc.

    Buttons, billiard balls, etc.

    Tanks, silos, pipelines, trellises .

  • Casting Polyurethanes
  • Urethane-Acrylates

    Urethane-acrylate resins are replacing fireproof polyester resins thanks to its better properties: mechanical, reactivity, fire resistance ...

    They are specially designed for applications in closed mould: RTM, infusion and pultrusion.

    Properties

    Very fast curing.

    Excellent resistance to fatigue in laminations with carbon or glass fiber.

    Low viscosity.

    Good ability to impregnate fiber reinforcements.

    Excellent surface finish.

    Compatible with polyester gelcoats.

    Impact resistance.

    Greater rigidity than polyester and vinyl ester resins.

    Low shrinkage.

    Quick release.

  • Vinyl Esters

    Vinyl ester resins

    Features

    Higher chemical resistance and better physical properties than polyester resins. 

    Better handling properties than epoxy and polyester resins.

    Excellent resistance to fatigue.

    Good impregnation of the reinforcements.

    Good adhesion to the reinforcing fibers.

    Resistant to corrosion, even in hot water.

    Good fire resistance.

    Laminatins with high resistance to water and harsh chemicals.

    Fast curing.

    Optimum performance is achieved when the laminatins are postcured at high temperatures (> 100 ºC)

    Very used in the construction of composite tools.

Showing 1 - 57 of 57 items
Showing 1 - 57 of 57 items
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