We are offering xylene. Xylene is a raw material in the production of a monomer called terephthalic acid. Xylene is a clear, colorless, sweet-smelling solution of three aromatic hydrocarbon isomers produced from crude oil through a process called alkylation. Xylene consists of three distinct isomers: paraxylene, orthoxylene and metaxylene. Xylene is both naturally occurring and manmade.