Vac GRP is a method for producing GRP components developed by Henleycraft Ltd. The difference between the conventional method of GRP Moulding, hand lay up and Vac GRP is the use of a secondary mould that fits inside the primary mould. A cavity is allowed for in the production of the moulds to the material thickness of the finished moulding.
The advantages of this method are:
• Shorter cycle times, enabling more products to be produced from the same mould in a days production.
• A constant material thickness, allowing 'first fit' of the component without the need to sand varying thicknesses as in hand lay up.
• A smooth finish on both faces of the component, with the option to have a high gloss or textured finish on both faces.
• The ability to incorporate rib, baffles, fixture and fittings in the initial moulding process without the need to secondary bond these fixtures on afterwards.
• A more environmentally friendly process for the operator.
• Less material wastage.
Although the tooling costs are more expensive than conventional Hand Lay Up Moulds, the part price can be considerably less.
The VacGRP secondary mould is then released from the primary mould