SPI Profile
  • Pultrusion is a continuous, semi automated process for manufacturing composite materials. Continuous fibres or fabrics made of glass or carbon fibres are impregnated with a resin in the impregnation bath. The material is then drawn through a heated die, by a pulling system located near the end of the pultruder. The composite is then cut into lengths with a cut-off saw.
  • Pultruded composites are ideal for infrastructure applications, as the composites are produced with a constant cross section. This makes them directly comparable with metal products, as composite channels and I-beams, as well as other standard sections. Structures made from composites can be light, strong and have no corrosion problems.
  • The pultrusion process has been used for several decades overseas. However, research to improve understanding of this process is in its infancy.
  • Pultruded grating is designed to provide increased strength/stiffness in conjunction with moderate levels of corrosion resistance. The benefits are derived from the pultruding process in which glass fibres are "pulled" through a thermoset resin bath which "wets out" (coats) the glass which then passes through a heated die.
  • High pressure and temperatures densify the composite, further impregnating the fibres and eliminating voids. This process offers a higher glass to resin ratio (approximately 65% glass to 35% resin by weight), which translates directly into its superior strength characteristics. Pultruded grating's production process allows for greater flexibility in panel sizes available.