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1,3,5-Trimethylbenzene, also know as mesitylene, is an aromatic hydrocarbon as well as a volatile organic compound (VOC). It is a clear liquid with a strong, peculiar odor. Used most often in solvents and thinners, 1,3,5 trimethylbenzene production exceeds 1 million pounds per year in the United States.


1,3,5 Trimethylbenzene is found in the following products

  • Solvents
  • Paint thinner
  • Auto fuel
  • Dyes
  • Wood stain


Human Health Effects

  • Irritant to skin, eyes, and respiratory tract causing redness and pain.
  • Repeated and chronic exposure can lead to chronic bronchitis.
  • Continual occupational exposure has lead to nervousness, tension, anxiety, and asthmatic bronchitis.
  • Inhalation and aspiration can cause confusion, drowsiness, headache, sore throat, and vomiting

Environmental Effects

  • Half-life: vapor in air=11 hours; river=1.2 hours; lake=4.4 days.
  • It can have a high potential for bioconcentration in aquatic organisms.


Hazardous Substance Data Bank- 1,3,5-Trimethylbenzene

Household Products Database- Mesitylene

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