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SEM-EDS from FG-4 inner sock. (a) Cut bundle of fiberglass and separate bundle of synthetic fibers. (b) Single fiberglass fibers with blunt ends and 8 um thickness. (c) Fiberglass fibers and synthetic fibers. (d) EDS acquired from fiberglass region marked in (c) showing Si, Al, and Ca. (e) EDS from bright spot in synthetic fiber marked in (c) exhibiting Cl and Sb.
