Frequent Question About Fiberglass Pultrusion

  •  What is fiberglass composite?

    Fibreglass, also called glass reinforced plastic (GRP) or fibre reinforced plastic (FRP), is a fibre reinforced polymer made of a plastic matrix (resin) reinforced by fine fibres of glass.
    Fibreglass composites are lightweight and extremely strong. Although strength properties are somewhat lower than carbon fibre and are less stiff, the material is typically far less brittle, and the raw materials are much less expensive.
    Its strength and weight properties are also very favourable when compared to metals.
  •  What type of resin are used to make fiberglass composite?

    There are 3 basic types of resin; Polyester, Vinyl Ester and Epoxy.
    Polyester resins provide good strength at relatively low cost. These resins can provide a wide variety of properties relating to water and chemical resistance, weathering and shrinkage during curing.
    Vinyl Ester resins are primarily used where improved water and chemical resistance, heat resistance or where improved flexibility is required. They have high resistance to acids, alkalis and solvents.
    Epoxy resins have a different structure to polyester or vinyl ester resins and are usually sold as a 2 pack system. Epoxy resins do not shrink as much as polyester or vinyl ester resins when they cure. Epoxy resins provide particularly good mechanical strength and adhesion, and have good stiffness, toughness, heat and water resistance.

  •  What is pultrusion?

    Pultrusion is a continuous low pressured moulding process using fibre reinforcements and thermosetting resin matrixes. The fibreglass reinforcements are drawn through a resin bath or injected with resin in which all fibres are thoroughly impregnated with the liquid resin system. The wetted out fibre is formed to the desired geometric shape and pulled into a heated steel die. Once inside the die, the resin cure is initiated by controlling at precise elevated temperatures. The composite laminate solidifies in the exact cavity shape of the die, as it is continuously “pulled” by the pultrusion machine, thus the name “Pultrusion”.
  •  Can any shape be pultruded?

    Almost any constant cross section can be pultruded.
    However, as with most continuous moulding processes, major changes in wall thickness over a relatively small area and sharp corners need to be reviewed during the design stage to ensure a viable frp pultruded profile for production.
  •  What are the most typical reinforcements used in the pultrusion?

    Typical reinforcements used are fibreglass roving, continuous fibre mat, woven and stitched fabrics. Other reinforcing materials such as carbon and aramid fibres, which are more costly, can be utilised during the pultrusion process to increase the modulus / stiffness of the composite member.
  •  Do pultruded profile need to painted?

    For most applications, resin pigments, surface veils and UV stabiliser additives eliminate the need for secondary painting applications.
    However, to improve the weathering properties or the appearance of a frp pultruded profile during outdoor exposure, it is highly recommended to paint the profile with a good quality acrylic or urethane paint system.
  •  What is the service life of pultruded profile?

    In general terms, pultruded products have been reported to be still in use after 25 plus years of active service in the field. As with any product, the service life is dependent on the application and how it is installed.
  •  What the price about pultruded product?

    Fibreglass pultrusions are normally less than the cost of stainless steel products, slightly more expensive than aluminium products and more expensive compared to carbon steel products.
    However, total installed cost of fibreglass pultrusion assemblies is generally more than price competitive compared to stainless steel and aluminium assemblies.
    When the whole-of-life cost is taken into consideration, fibreglass pultrusion assemblies are even competitive against the carbon steel versions.
  •  What resin should be used in frp pultruded grating?

  • FRP pultruded grating used Ortho,ISO,Vinyl resin
  • Carbon fibre should only be used with Epoxy or Vinyl Ester resins.

On 08, 3, 2014, posted in: FRP Profile News by

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