Glass fibre harnesses are made up of tails which contain many fine glass fibres sheathed in a black coloured low smoke material. The ends are finished with crimp terminations for the smallest diameters and with brass or stainless steel ferrules for larger diameters.
Because the glass fibres in each tail are very fine they can be mixed-up in the common end (known as randomising) to give a more even light output between individual ends.
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End lit PMMA fibre comes in two configurations - single sheathed or unsheathed strands of 0.75mm, 1mm, 1.5mm or 2mm diameter fibre, or as multiple sheathed strands of 0.75mm fibre.
Single strands of fibre give starry points of light and normally require no termination, whilst multi-stranded varieties are normally terminated with a ferrule to allow the attachment of an end fitting.
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