Why Composite?

Composite Pipe, also referred to as GRP (Glass Reinforced Plastic) or FRP (Fibreglass Reinforced Plastic) combines resins with glass fibres and once cured produces a very strong interwoven matrix. Different thermosetting resins can be used depending on the corrosion resistance or temperature resistance properties required. Different reinforcing fibres can be used depending on the electrical resistance/ph environment and mechanical strength required.

It is possible to make composite/GRP pipes in 3 different ways resulting in 3 different qualities of pipe. Purepipe’s process of Discontinous Helical Filament winding without the use of sand as a filler material produces the best quality of GRP pipe:

Discontinuous Helical Filament Wound without sand
The reinforced fibres are laid in a digitally controlled manner in hoop and longitudinal directions, producing a pipe with the best pipe performace characteristics and aligned with the customer’s needs. High pressure resistance, High Stiffness Resistance, High Corrosion Resistance and High Flexibility can all be achieved and sustained over time. The pipes are typically 12 metres long but can be up to 18 metres in length. 65% Glass Fibre 35% Resin 0% Sand.

Alternative 1
Centrifugally Cast Reinforced Plastic Mortar

The reinforcing fibres are chopped and then randomly orientated producing a pipe with good stiffness characteristics but minimal pressure resistance. The maximum length of pipe is typically only 6m. 15% Glass Fibre, 20% Resin and 65%Sand.

Alternative 2
Continuous Filament Wound with Sand

The reinforcing fibres are laid in a controlled hoop direction but only at one angle (approx. 88 degrees). Limited longitudinal reinforcement is achieved by random lay of chopped fibres. A better quality of pipe and capable of handling larger internal pressures but again there are significant limitations in pipe performance. 25% Glass Fibre, 25% Resin and 50% Sand.