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The tip of the preform is
heated to about
2000°C in a furnace.
As the glass softens, a thin strand of
softened glass falls by gravity
and cools down.
As the fibre is drawn its diameter is constantly monitored
A plastic coating is then applied to the fibre, before it touches any components. The coating protects the fibre from dust and moisture.
The fibre is then wrapped around a spool.