GRP Moulding

GRP moulding refers to the moulding of parts made from glass-reinforced plastic - or GRP for short. Otherwise known as fibreglass, this material is renowned for being both strong and very lightweight. Common applications for GRP include boat building, construction and the manufacture of automotive body parts such as bumpers.

An exclusive process is used to manufacture components from GRP material. Firstly, a copy of the required product is manufactured - usually from foam - before being sprayed with a special wax called a release agent to allow easy separation from the mould post-production. This part is commonly referred to as a plug and is an exact replica of the required component. Layers of fibreglass and resin are then layered on top of the plug and cured, which - once solidified and separated from the plug - will become the mould.

The same technique of layering and curing GRP within the mould is then used to create the product. As the mould is also coated in a release agent, it is simple to separate it from the moulded part once the moulding process is complete.

Used to produce

Parts made from GRP, otherwise known as fibreglass.


GRP stands for glass-reinforced plastic, which is renowned for being both strong and very lightweight.


The primary method for producing GRP or fibreglass components.
Results in a durable product.
GRP is a cost-effective, versatile material


GRP moulding can be quite a lengthy process in comparison to other moulding methods, as it remains mostly manual.
GRP moulds and plugs can prove expensive depending on the complexity of the part.

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