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SF6 hvdc concentration factorys

VELCO's Contribution to Global Warming remaining 20% of SF6 uses include aluminum manufacture, semiconductor technology, plasma processing, thermal insulation. Actual measurements of SF6 in the atmosphere indicate that its concentration has increased from .03 parts per trillion by volume (pptv) in 1970 to 2.8 pptv in 1992, which is an increase of two orders of magnitude.

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