Sulphur hexafluoride (SF6) is a colourless and odourless gas. Pure SF6 is non-
poisonous, therefore. no risk classification has to be followed.
As reference for the degree of toxicity ,t.he German MAK-values (maximum ambient
concentration value for an ei9ht-hour stay) are given:
The mclximumconcentration at a place of work, assuming that a person spends
8 hour's per day there, is 1000 ppm (or 0.1
%)
by volume. Thi s very low value
is the standard value adopte1d for all gases cons i dered haJ'ffi'less, but not
normally present in the atmosphere.
Under the influence of an are, decomposition products occur which are partly
toxic,
The decomposition products of SF6 are of different toxicity. They may irritate
mucou~ membrane~, respiratory- tracts and other unprotected skin. Almost
immediately - prior to the dan~I'~r of poisoning arising - even smallest amounts
of gaseous decomposition products can be recognised by their strongly pungent,
disagreeable odour.
To Next Page
Loading...
