Signature Products Fibreglass Spray Lay-Up Process

Signature Products Fibreglass Spray Lay-Up Process

To explain the process involved for fibreglass spray lay-up processes, we have taken some information from FRP Institute Worcester, MA, US and from Crystic Composites Handbook by Scott Bader

This process involves the use of a spray gun for the simultaneous deposition of chopped glass and catalyzed resin on to the surface of a mould.

A chopper unit attached to the spray gun chops glass roving in to specified lengths (usually 20 to 50 mm), the chopped strands are then directed towards a stream of catalyzed resin as it exits the spray gun.

Those resins in the Crystic range which are designed for spray application are generally low in viscosity, so they rapidly wet out the chopped strands. This ensures they are more easily atomizeFibreglass Spray Lay-Up Processd in to the desired spray pattern. The rapid wet out achieved by spray deposition allows faster and easier consolidation than would be achieved with hand lay methods, but thorough rolling of the laminate is still necessary to ensure complete air removal. The efficiency of the catalyst dispersion in the resin can also be checked at this stage. If using resins which incorporate a colour change mechanism on catalyst addition, or catalysts which contain coloured dyes, the uniformity of catalyst dispersion can be easily monitored.

Workers roll out the spray-up to compact the laminate. Wood, foam or other core material may then be added, and a secondary spray-up layer imbeds the core between the laminates (sandwich construction). The part is then cured, cooled and removed from the reusable mould.

If you would like any further information, or would like to discuss your requirements with our team – get in touch! 


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