Fiberline (Glass reinforced plastic)

Polyester reinforced with layers of carefully aligned glass fibre. This plastic is stronger, harder and more durable than other plastics and can perform well in tasks that other plastics would not be able to stand up to. It should be noted it is different to fibre glass which is glass fibres in a resin. instead this is where the plastic and fibre are carefully aligned to a specific geometry for the application though some cheaper version exist which merely use the glass as an additive.


  • Stronger per weight than regular plastic (comparable to steel in some cases)
  • Good electrical insulator
  • Weatherproof
  • Fire resistant
  • Abrasion resistant


  • Health issues if exposed to it as a dust when working with the material.

Manufacture & Fabrication

GRP is made from a process called Pultrusion and is very strong, it can be found most often in long extrusions. The shapes are limited to what the pultrusion can achieve and the materials can be shaped using grinding and cutting tools after manufacture but can’t be thermoformed.

Durability & Sustainability

The GRP is much more durable than other plastic as the glass fibre and actually holds up to environmental and work environments better than steel. It can be recycled by being ground down into a powder and included in other materials to improve strength though only in very limited applications.

Find out more at Fiberline

Video of a fiberline bridge being flown in.


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