What is aramid yarn (Kevlar)?

OFSCN Global Technical Center OFSCN Technical Knowledge Base
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What are those yellow fibers inside the fiber optic cable? Are they for bulletproofing?

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The yellow, filamentous fibers in optical cables, known in optical engineering and cable manufacturing as Aramid yarn, with its most famous commercial brand being Kevlar®, developed by DuPont. It is an artificially synthesized para-aramid fiber.

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