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Glass fibres, coloured scanning electron micrograph (SEM). Glass fibres (seen here in comparison with two hairs, brown) are often used as a reinforcing agent. They are woven into sheets and then impregnated with a plastic resin to produce fibreglass. Other uses include as separators in batteries, diaphragms in fuel cells, fibre optic cables and super lightweight insulation. Magnification: x225 when printed 10 centimetres wide.
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