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EC number: 295-405-4
CAS number: 92045-23-3
A complex combination of hydrocarbons produced by the distillation of the products of a steam cracking process. It consists predominantly of hydrocarbons having a carbon number of C4, predominantly 1-butene and 2-butene, containing also butane and isobutene and boiling in the range of approximately minus 12°C to 5°C (10.4°F to 41°F).
PRESSURE / PULSE RATE: Results were too variable to be of any
TEST: Minimum tapping rate in any 6 seconds (as % of day’s normal) was
100 at 8000 ppm with a maximum co-efficient of variation of 0.087. At
2000 and 4000 ppm the tests were too brief to be reliable and therefore
the results were inconclusive.
was judged to be innocuous at the concentrations inhaled. At
concentrations of 2000 and 4000 ppm (4425 and 8851 mg/m3) odour was
considered to be objectionable. The authors stated that provided that
the lower explosive limit is not exceeded, it is unlikely that the
health of anyone inhaling its vapours will be impaired.
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