Continuous glass fibres are manufactured by constantly feeding molten glass from a furnace into a forehearth fitted with 1600 accurately manufactured holes through which the glass is drawn at several thousand metres per second. The fibres (as small as 9 microns in diameter) pass over a size applicator and are gathered together as a bundle prior to being wound up on a collet. The material may then be used as rovings, chopped strand or woven strand mats for the production of glass-fibre reinforced materials such as GRP (glass-fibre reinforced polyester), GRC (glass-fibre reinforced cement), or GRG (glass-fibre reinforced gypsum) - see Chapter 11.
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