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C4 Fraction
General Characteristics

C4 fraction is a mixture of liquified hydrocarbons with prevailing content of 4 carbon atoms in their molecules. It is manufactured by fractional distillation of pyrolysis gases from steam cracking of oil fractions. It is an easily volatile, flammable and combustible substance of characteristic odour.

C4 fraction is used as an intermediate for the production of chemical substances (1,3-butadiene and isobutane) and is used during its whole life cycle under strictly controlled conditions defined in article 18(4) of Regulation (EC) No 1907/2006 REACH.

The product is classified as hazardous pursuant to Act No. 350/20011 Coll. and corresponding EU legal regulations (Regulation (EC) No 1272/2008 CLP, Directive No 67/548/EHS or Directive No 1999/45/EC.


Parameter Unit Values Test Method
1,3-butadiene %​​ wt. min. 40 gas chromatography
1,3-butadiene and isobutene % wt. min. 65 gas chromatography
C3 and lower hydrocarbons % wt. max. 0,7 gas chromatography
C5 and higher hydrocarbons % wt. max. 0,3 gas chromatography
Methylacetylene % wt. max. 0,1 gas chromatography
Ethylacetylene and vinylacetylene % wt. max. 1,5 gas chromatography
Carbonyls mg/kg max. 150 ASTM D 4423
C4 saturated hydrocarbons % wt. max. 10 gas chromatography
Sulphur (H2S + mercaptanes) mg/kg max. 5 electrochemical method
Stabilizer (inf. value) ppm wt. min. 50 gas chromatography

Packaging, Storage, Transportation
C4 fraction is transported via pipeline.


Business Contact

Marta Rosul
tel. +48 24 256 66 16


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