Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. solvent
7. [solvent by composition or origin]
8. hydrocarbon solvent

Narrower term/s

• benzene
• toluene
• xylene

Anotations

Scope note:

One of four main types of hydrocarbon found in crude oil belonging to the class of organic compounds that has an unsaturated ring of carbon atoms, considered generally more volatile and active than an aliphatic hydrocarbon.