TSCA Definition 2019: A complex combination of hydrocarbons produced by the thermal cracking of ethane and propane. It contains predominantly cyclic hydrocarbons having carbon numbers predominantly in the range of C5 through C10, primarily benzene, cyclopentadiene, dicyclopentadiene, toluene, and xylenes.

TSCA Definition 2019: A complex combination of hydrocarbons produced by distillation of products from a cracking process in the ethylene plant. It consists of aromatic hydrocarbons having carbon numbers predominantly in the range of C5 through C10, primarily benzene.

TSCA Definition 2019: A complex combination of hydrocarbons obtained as the raffinate from the desulfurization extraction of crude coal tar. Composed primarily of benzene, toluene, ethylbenzene, xylenes, cyclohexane, cyclopentane, methylhexane and methylpentane.