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Thursday, November 25, 2010

Glass Fibre

Glass Fibre
Glass Fibre

This is a process in which fibreglass if formed into shapes, the mould process begins with an object known as a buck or sometimes as a plug, this plug or buck is an exact representation of the item that is about to be made, a number of materials can be used for this with foam being the most common.

The process of making the buck begins and when finished a mould release agent is sprayed over it; this will allow the mould itself to separate away from the plug when the whole process is completed. The release agent is a special type of PVA or wax. Wax tends to be the preferred choice as PVA (Polyvinyl alcohol) effects the surface finish of the mould in a negative way.

After the release agent has been applied to the plug another item is used to coat the mould; Gelcoat, this is applied with a spray gun, roller or a brush, this gives the surface of the mould a more durable, harder finish. Gelcoat is a pigmented resin.

The next step is where the Glass Fibre is applied; it is called the laying up process. A mat fibreglass layer is applied and then coated with a resin. The air bubbles are removed by using a special roller, these bubbles must be removed and if they are left in the strength of the product would be significantly reduced.

The final layers of fibreglass must be applied, when they have it will be left alone allowing the resin to set and cure. The mould is then removed from the buck and your Glass Fibre Moulding is complete.

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