Raw Material

How the pultrusion process work?

Fibreglass Pultrusion can be used to produce practically any constant cross sectional profile as well as the seamless round rods. As pultrusion is a continuous process, the product can be manufactured to any length and the limit is only dictated by the ability to transport it.

The pultrusion process is a continual process like extrusion (which makes plastic pipes or aluminium window frames etc.) The difference between the two is that extrusion pushes the material through a hardened steel die while pultrusion, as it's name implies, pulls the continuous fibre reinforcement in roving or mat/roving form through a resin bath where each fibre is coated with a specially formulated resin matrix. The fully "wet-out" fibres are then drawn into a heated steel die. The thermoset resin cure is initiated by the heat from the die which acts on the catalyst in the resin formulation. The rate of the chemical reaction is controlled by heating and cooling zones along the length of the die. The high strength pultrusion profile thus produced is ready to use as it exits the pultrusion machine.

Although the concept of pultrusion seems quite simple, there is a delicate balance that has to be maintained between materials, temperature and production speed.

Pultruded Structural Shape Properties

  • Resistant to corrosion and corrosive elements such as salts, acids and alkalis over a broad concentration and temperature range
  • High strength - high tensile & flexural strength kilo for kilo stronger than steel
  • Lightweight / lower density - 25% of steel & 65% of aluminium
  • Superior dimensional stability over a wide range of temperatures
  • Thermally insulating
  • Electrically insulating
  • Consistent cross-section
  • Inbuilt colour options
  • Electromagnetic transparency
  • Ease of fabrication