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Explanation: Could this possibly be a typographical error and should read swarf?
Späne m pl, Schleifschlamm m, Abfall m
This is also supported by Kucera, Compact Dictionary of Exact Science and Technology
"swarth", according to the new American Heritage dictionary of the english language, is a variant of
VARIANT FORMS: also swarth (swôrth)
NOUN: 1. Land covered with grassy turf. 2. A lawn or meadow. www.bartleby.com/61/41/S0934100.html
which wouldn't seem to fit into your context.
Siemens, FWB industrielle Elektrotechnik, Energie- und Automatisierungstechnik