Fibreglass

Other Names:

Fibreglass, glass-reinforced plastic, GRP.

Description:

The fabric is a reinforced polymer made of a plastic matrix reinforced by fine fibers of glass. The plastic matrix may be epoxy or a thermosetting plastic, most often polyester or vinylester.

The fibres are extruded through bushings, which are bundles of very small orifices (typically 5–25 micrometres in diameter for E-Glass, 9 micrometres for S-Glass). These filaments are then sized (coated) with a chemical solution. The individual filaments are then bundled together in large numbers to provide a roving. The diameter of the filaments, as well as the number of filaments in the roving determine its weight.

Advantages:

A cheap way of adding strength.

Disadvantages:

Can easily add a lot of weight.

Handling:

Cuts with scissors. Apply to the surface with epoxy resin. Suggest using a marine epoxy, WEST, Norski, Epiglass etc. Note their mix ratios (4:1, 5:1 etc.) which should be as exact as possible. Don't try changing the ration to change setting times - it doesn't work that way as it is a chemical reaction and needs the correct manufacturer's ratios.

Clean off with vinegar.

Suppliers:

Marine shops.