Complex hydrocarbons are prepared by refining crude oil and coal tar.
Complex hydrocarbons are mixtures of various organic substances and are often classified as toxic and carcinogenic. They are regarded as phase-out substances in the PRIO tool. Examples of the substances with the most hazardous properties are benzene and polyaromatic hydrocarbons (PAHs).
The complex hydrocarbons to be classified as carcinogenic must not be used in chemical products sold to the public, see The Swedish Chemicals Agency's Chemical Products and Biotechnical Organisms Regulations (2008:2), Chapter 8, Section 28. They may only be used professionally. Many complex hydrocarbons can be treated chemically so that the concentrations of the carcinogenic constituents are reduced. When the concentrations of these substances fall below particular limit values, the complex hydrocarbon no longer has to be classified as carcinogenic. On the market, most complex hydrocarbons are treated and are therefore not to be regarded as phase-out substances. Link to the Restricted substances database.
Substance group PAHs
CLP/ GHS database index groups 648 and 649