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What is Pultrusion?

Pultrusion is a manufacturing process used to create composite materials with a constant cross-sectional profile. The term "pultrusion" is derived from the combination of "pull" and "extrusion," reflecting the method's unique approach to shaping materials.

Key Features of Pultrusion:

  • High Strength: Pultruded composites are known for their high tensile strength and stiffness.
  • Lightweight: They are significantly lighter than traditional materials like steel or aluminium.
  • Corrosion Resistance: Pultruded materials are resistant to chemicals and environmental degradation.
  • Custom Shapes: The process allows for the production of complex shapes and profiles.
  1. Process: In pultrusion, continuous fibers (such as glass, carbon, or aramid) are pulled through a resin bath, where they are saturated with a thermosetting resin. The saturated fibers are then pulled through a heated die, where the resin cures and hardens, forming a solid composite material.
  2. Materials: The process typically uses composite materials, which combine fibers for strength and a resin for binding. Common resins include epoxy, polyester, and vinyl ester.
  3. Applications: Pultruded products are used in various industries, including construction, automotive, aerospace, and marine. Common applications include structural components, beams, rods, and other shapes that require high strength-to-weight ratios and corrosion resistance.
  4. Advantages: Produce long consistent cross sections of the same mechanical properties. The most cost-efficient method of manufacturing for large profiles with a significant reduction in lead time compared to other methods.
  5. Limitations: While pultrusion is efficient for producing long, continuous shapes, it may not be suitable for all geometries, especially those requiring intricate details or varying cross-sections.

Overall, pultrusion is a highly efficient and effective method for producing strong, lightweight composite materials tailored for specific applications.


Check out the video below to see how the process works.