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Aromatics

Mesitylene

Also known as 1,3,5-Trimethylbenzene, sym-Trimethylbenzene, 3,5-Dimethyltoluene

CAS 108-67-8Formula C9H12Molar mass 120.20 g/molEC 203-604-4
GHS signal word: Warning. Pictograms: Flammable, Harmful or irritant, Hazardous to the environment 48 suppliers listed
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Mesitylene chemical structure, C9H12, CAS 108-67-8
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Clear, colorless liquid
Melting point
-44.8 °C
Boiling point
164.7 °C
Density
Relative density (water = 1): 0.86
Flash point
50 °C
HS code
290290
Category
Aromatics
UN number
UN 2325
Illustrative photo, clear liquid in a volumetric flask on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Mesitylene?

Plain description, key identifiers and synonyms

1,3,5-trimethylbenzene is a trimethylbenzene carrying methyl substituents at positions 1, 3 and 5.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,3,5-trimethylbenzene
CAS number
108-67-8 CAS number cross-checked
EC number
203-604-4
Molecular formula
C9H12
UNII
887L18KQ6X
MDL number
MFCD00008538
INCI name
MESITYLENE
InChIKey
AUHZEENZYGFFBQ-UHFFFAOYSA-N
InChI
InChI=1S/C9H12/c1-7-4-8(2)6-9(3)5-7/h4-6H,1-3H3
SMILES (canonical and isomeric)
CC1=CC(=CC(=C1)C)C

Synonyms

  • 1,3,5-Trimethylbenzene
  • sym-Trimethylbenzene
  • 3,5-Dimethyltoluene
  • Fleet-X
  • Trimethylbenzol
  • Benzene, 1,3,5-trimethyl-
  • Symmetrical trimethylbenzene
  • s-Trimethylbenzene
  • 2,4,6-trimethylbenzene
  • 1,3,5-trimethyl-benzene
  • Trimethylbenzene, 1,3,5-
  • Mesitylene, 98%
  • 1,3, 5-Trimethylbenzene
  • 1,3,5-Trimethylbenzene 100 microg/mL in Methanol
  • Mesitylene (ACD/Name 4.0)
  • Mesitylene, analytical standard
  • Mesitylene, reagent grade, 97%
  • Benzene,1,3,5-trimethyl
  • 1,3,5-Trimethylbenzene (Mesitylene)
  • Mesitylene, purum, >=98.0% (GC)
  • UN 2325
  • 1,3,5-Trimethylbenzene [UN2325] [Flammable liquid]
  • Mesitylene, certified reference material, TraceCERT(R)
  • 1,3,5-Trimethylbenzene Solution in Methanol, 1000ug/mL

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Clear, colorless liquidexp.
Odour
Peculiar odorexp.
Melting point
-44.8 °Cexp.
Boiling point
164.7 °Cexp.
Density
Relative density (water = 1): 0.86exp.
Flash point
50 °Cexp.
Autoignition temperature
559 °Cexp.
Solubility
In water, 48.2 mg/L at 25 °Cexp.
Vapour pressure
1.86 mm Hg @ 20 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
120.20 g/molcalc.
Exact mass
120.0939 Dacalc.
LogP (octanol/water)
2.61calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
9calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.33calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccccc1

c1ccccc1

1 ring, 6 atoms, the Benzene ring system.

485,677 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS02: Flammable
Flammable
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment
220NFPA 704 rating

Hazard statements

  • H226Flammable liquid and vapour.
  • H335May cause respiratory irritation.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (19)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P233Keep container tightly closed.
  • P240Ground and bond container and receiving equipment.
  • P241Use explosion-proof electrical, ventilating and lighting equipment.
  • P242Use non-sparking tools.
  • P243Take action to prevent static discharges.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P303 + P361 + P353If on skin (or hair): Take off immediately all contaminated clothing. Rinse skin with water or shower.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P319Get medical help if you feel unwell.
  • P370 + P378In case of fire: Use appropriate media to extinguish.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P403 + P235Store in a well-ventilated place. Keep cool.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2325
Transport hazard class
3
Packing group
III

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Mesitylene suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 48 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

48 suppliers in 9 countries

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Mesitylene price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Dyestuff intermediate, solvent, paint thinner.

Chem int for anthraquinone vat dyes and for uv oxidation stabilizers for plastics.

Used as a chemical intermediate for the synthesis of mesidine, trimesic acid, 2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)mesitylene.

The principal use for mesitylene is its conversion to 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, trade name is Ethanox 330 ... an important non-coloring stabilizer (antioxidant) for plastics, adhesives, rubber, and waxes.

Industrial uses: Fuel agents, Other, Solvent, Intermediate, Corrosion inhibitor.

Consumer uses: Solvent, Fuel, Diluent.

Cosmetic ingredient, INCI name MESITYLENE(solvent)

Functional uses

  • Fragrance
  • Solvent

Cosmetic functions

  • Solvent

How it is made

By dehydrating acetone with sulfuric acid.

Trimethylbenzene fraction (fractionation, coproduced with pseudocumene/durene)

Acetone undergoes aldol addition in the presence of sulfuric acid to give mesityl oxide, which then condenses with a third molecule of acetone to give a mixture of phorone (2,6-dimethyl-2,6-heptadien-4-one) and mesitylene (1,3,5-trimethylbenzene).

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 601-025-00-5

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Mesitylene is traded under.

HS 2902.90Indicative HS code

Cyclic hydrocarbons, other

World exports in 2024
$612M
−6.1% vs 2023, imports $670M
2019 to 2024
Top exporters
  1. China28.0%
  2. Germany13.9%
  3. India * partner reported12.6%
Top importers
  1. Germany11.1%
  2. United States10.6%
  3. South Korea8.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Mesitylene is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Mesitylene, based on the data on this page

What is Mesitylene?

1,3,5-trimethylbenzene is a trimethylbenzene carrying methyl substituents at positions 1, 3 and 5.

What is the CAS number of Mesitylene?

The CAS registry number of Mesitylene is 108-67-8.

What is the molecular formula and weight of Mesitylene?

The molecular formula of Mesitylene is C9H12 and its molar mass is 120.20 g/mol.

What is Mesitylene used for?

Dyestuff intermediate, solvent, paint thinner. Chem int for anthraquinone vat dyes and for uv oxidation stabilizers for plastics. Used as a chemical intermediate for the synthesis of mesidine, trimesic acid, 2,4,6-tris(3,5-di-t-butyl-4-hydroxybenzyl)mesitylene.

Is Mesitylene hazardous?

Mesitylene carries the GHS signal word "Warning". Main hazards: flammable liquid and vapour, may cause respiratory irritation, toxic to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Mesitylene?

Mesitylene is usually classified under HS code 290290 (Cyclic hydrocarbons, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Mesitylene?

CompoundList lists 48 suppliers of Mesitylene in China, United States, Germany, India and 5 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Mesitylene in India?

3 suppliers in India list Mesitylene on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Mesitylene?

Suppliers quote Mesitylene on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Mesitylene

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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