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Orthoxylene

CAS Number:95‑47‑6

Synonyms:o‑Xylene; 1,2‑Dimethylbenzene; Orthoxylene; o‑Xylol

Chemical Formula:C₈H₁₀

Molecular Weight:106.17 g/mol

Product Introduction

A colorless, slightly oily flammable aromatic hydrocarbon with a mild sweet aroma. Predominantly used as a solvent and chemical intermediate, especially in the manufacture of phthalic anhydride via oxidation—used also in coatings, cleaning fluids, inks, and rubber.

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Physical & Chemical Properties

Property	Value
Appearance	Colorless, slightly oily liquid
Density @ 20 °C	~0.879 g/mL
Melting Point	–24 °C
Boiling Point	~143–145 °C
Vapor Pressure @ 20 °C	~7 mm Hg
Refractive Index (n₂₀ᴅ)	~1.505
Solubility in Water	~0.02 % (insoluble)
Vapor Density	~3.7 × air
Explosion Limits	~0.9–6.7 vol %
Autoignition Temperature	~463 °C

Applications

Chemical intermediate:Key reagent in phthalic anhydride production
Solvent:Used in coatings, adhesives, cleaning agents, inks, varnishes, rubber, printing, and leather industries

Safety & Handling

Highly flammable; vapors heavier than air. GHS: H226/H304/H312/H332/H315/H319/H335/H412. OSHA/ACGIH TWA 100 ppm; STEL 150 ppm; IDLH 900 ppm. Use PPE, ensure ventilation, store cool and sealed.