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how glass fibre is made


    The glass fibres for GRP and GRG are manufactured from standard E-glass. Molten glass runs from the furnace at 1200°C into a forehearth, and through a spinneret of fine holes from which it is drawn at high speed down to approximately 9 microns in thickness. The glass fibres are coated in size and bundled before winding up on a collet. Subsequently the glass fibre ‘cake’ is either used as continuous rovings or cut to 20–50 mm loose chopped strand. Glass fibre rovings may be manufactured into woven mats; chopped strand mats are formed with organic binder.

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