XYLENE (ALL ISOMERS) 

Molecular formula: C₈H₁₀ 

MIXED ISOMERS 

CAS: 1330-20-7 

Synonyms: Dimethylbenzene; Methyl toluene (mixed isomers) 

p-XYLENE 

CAS: 106-42-3 

Synonyms: 1,4-Dimethylbenzene; p-Dimethylbenzene, p-Methyl toluene; 1,4-Xylene;
para-Xylene; p-Xylol 

Structural formula: 

(National Center for Biotechnology Information (NCBI; US) 2005b) 

o-XYLENE 

CAS: 95-47-6 

Synonyms: 1,2-Dimethylbenzene, o-Dimethylbenzene; o-Methyl toluene; 1,2-Xylene;
ortho-Xylene; o-Xylol 

Structural formula: 

(National Center for Biotechnology Information (NCBI; US) 2005a) 

 m-XYLENE 

CAS: 108-38-3 

Synonyms: 1,3-Dimethylbenzene; o-Dimethylbenzene, m-Methyl toluene; 1,3-Xylene; meta-Xylene; m-Xylol 

Structural formula: 

(National Center for Biotechnology Information (NCBI; US) 2005c) 

TLV^®–TWA, 20 ppm 

A4 – Not Classifiable as a Human Carcinogen 

OTO p-xylene and mixed isomers containing p-xylene

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