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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).
The autoflammability temperature of members of category C4, high 1,3-butadiene (≥ 0.1%) range is 364 to 413°C.
data were available from proprietary studies from BASF for the CAS
numbers 87741-01-3: 364°C, 92045-23-3: 374°C and 64742-83-2: 413°C (BASF
2008). The studies were based on standard guidelines and so were
considered reliable for use. The autoflammability of Category C4, high
1,3 -butadiene (≥0.1%)
is therefore reported to range from 364 to 413°C.
mean of the autoflammability temperature values for the category is 384°C
at approximately 101325 Pa and this has been used to complete the 'key
value for chemical safety assessment'.
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