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InventoryRef 9017806/12/2013

MESITYLENE

Benzene, 1,3,5-trimethyl-,3,5-Dimethyltoluene

MESITYLENE is listed in the EU CosIng inventory, but no direct annex records are linked on this page yet.

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Regulatory evidence by market

No rule for this ingredient has been imported for any of the 13 markets tracked here.

That describes this inventory, not the law. No imported rule is not evidence that an ingredient is permitted: a rule may exist under another name or identifier, or in a dataset not yet imported here.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 108-67-8
CAS 108-67-8PubChem CID 7947

Mesitylene

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

IUPAC name
1,3,5-trimethylbenzene
Molecular formula
C9H12
Molecular weight
120.19 g/mol
Exact mass
120.093900383 Da
XLogP3
3.4
Topological polar surface area
0.0 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
0
Covalent units
1
Defined stereocentres
0

Also known as

sym-Trimethylbenzene3,5-DimethyltolueneFleet-XTrimethylbenzolBenzene, 1,3,5-trimethyl-887L18KQ6XNSC-9273CHEBI:34833
16 more reported names
Symmetrical trimethylbenzeneRefChem:6006203-604-4s-Trimethylbenzene2,4,6-trimethylbenzene1,3,5-trimethyl-benzeneNSC 9273Trimethylbenzene, 1,3,5-CAS-108-67-8HSDB 92EINECS 203-604-4UN2325UNII-887L18KQ6XAI3-23973CCRIS 8147Mesitylene, 98%
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match7947

Attributed physical-property, hazard, environmental and use annotations.

  • First Aid: Excerpt from NIOSH Pocket Guide for 1,3,5-Trimethylbenzene:; Eye: IRRIGATE IMMEDIATELY - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: SOAP WASH - If this chemical contacts the skin, wash the contaminated skin with soap and water.; Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.; Swallow: MEDICAL ATTENTION IMMEDIATELY - If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2024) Source: CAMEO Chemicals
  • ERG2024, Guide 129 (1,3,5-Trimethylbenzene): General First Aid:; · Call 911 or emergency medical service.; · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.; · Move victim to fresh air if it can be done safely.; · Administer oxygen if breathing is difficult.; · If victim is not breathing:; -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.; -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).; -- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.; · Remove and isolate contaminated clothing and shoes.; · For minor skin contact, avoid spreading material on unaffected skin.; · In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.; · For severe burns, immediate medical attention is required.; · Effects of exposure (inhalation, ingestion, Source: Emergency Response Guidebook (ERG)
  • First Aid: (General first aid procedures); Eye: Irrigate immediately - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: Soap wash - If this chemical contacts the skin, wash the contaminated skin with soap and water.; Breathing: Respiratory support; Swallow: Medical attention immediately - If this chemical has been swallowed, get medical attention immediately. Source: The National Institute for Occupational Safety and Health (NIOSH)
  • Signal: Warning Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • GHS Hazard Statements: H226: Flammable liquid and vapor [Warning Flammable liquids]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H411: Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard] Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P261, P271, P273, P280, P303+P361+P353, P304+P340, P319, P370+P378, P391, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: Regulation (EC) No 1272/2008 of the European Parliament and of the Council
  • Note: This chemical does not meet GHS hazard criteria for < 0.1% (2 of 2655) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H226 (> 99.9%): Flammable liquid and vapor [Warning Flammable liquids]; H304 (12.7%): May be fatal if swallowed and enters airways [Danger Aspiration hazard]; H315 (45.4%): Causes skin irritation [Warning Skin corrosion/irritation]; H319 (40.6%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]; H335 (99.8%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H411 (97.9%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P261, P264, P264+P265, P271, P273, P280, P301+P316, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P319, P321, P331, P332+P317, P337+P317, P362+P364, P370+P378, P391, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 2655 reports by companies from 55 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 2 of 2655 reports by companies.; There are 54 notifications provided by 2653 of 2655 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: NITE-CMC
  • GHS Hazard Statements: H226: Flammable liquid and vapor [Warning Flammable liquids]; H304: May be fatal if swallowed and enters airways [Danger Aspiration hazard]; H315: Causes skin irritation [Warning Skin corrosion/irritation]; H320: Causes eye irritation [Warning Serious eye damage/eye irritation]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H336: May cause drowsiness or dizziness [Warning Specific target organ toxicity, single exposure; Narcotic effects]; H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure]; H401: Toxic to aquatic life [Hazardous to the aquatic environment, acute hazard]; H411: Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard] Source: NITE-CMC
  • Precautionary Statement Codes: P210, P233, P240, P241, P242, P243, P260, P261, P264, P264+P265, P270, P271, P273, P280, P301+P316, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P319, P321, P331, P332+P317, P337+P317, P362+P364, P370+P378, P391, P403+P233, P403+P235, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
  • GHS Hazard Statements: H226: Flammable liquid and vapor [Warning Flammable liquids]; H304: May be fatal if swallowed and enters airways [Danger Aspiration hazard]; H315: Causes skin irritation [Warning Skin corrosion/irritation]; H320: Causes eye irritation [Warning Serious eye damage/eye irritation]; H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]; H336: May cause drowsiness or dizziness [Warning Specific target organ toxicity, single exposure; Narcotic effects]; H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure] Source: NITE-CMC
  • NFPA Health Rating: 2 - Materials that, under emergency conditions, can cause temporary incapacitation or residual injury. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Fire Rating: 2 - Materials that must be moderately heated or exposed to relatively high ambient temperatures before ignition can occur. Materials would not under normal conditions form hazardous atmospheres with air, but under high ambient temperatures or under moderate heating could release vapor in sufficient quantities to produce hazardous atmospheres with air. Source: Hazardous Substances Data Bank (HSDB)
  • NFPA Instability Rating: 0 - Materials that in themselves are normally stable, even under fire conditions. Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Bioconcentration: BCF values of 23-342 and 42-328 were measured in carp for 1,3,5-trimethylbenzene concentrations of 150 and 15 ug/L, respectively(1). According to a classification scheme(2), BCF values of zero to 30 are low and from 100 to 1,000 are high(SRC). Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: TERRESTRIAL FATE: Based on a classification scheme(1), an experimental Koc range of 501-1,445(2-5), indicates that 1,3,5-trimethylbenzene is expected to have low mobility in soil(SRC). Volatilization of 1,3,5-trimethylbenzene from moist soil surfaces is expected to be an important fate process(SRC) given an experimental Henry's Law constant of 8.77X10-3 atm-cu m/mole(6). 1,3,5-Trimethylbenzene is expected to volatilize from dry soil surfaces(SRC) based upon a vapor pressure of 2.48 mm Hg(SRC), from experimentally-derived coefficients(7). Complete removal of 1,3,5-trimethylbenzene from sterile sandy loam soil samples contaminated with jet fuel was reported within 5 days, probably due to evaporation(8). Biodegradation is expected to occur in soil, and acclimation may increase the rate of biodegradation(SRC). 1,3,5-Trimethylbenzene, present at a concn of 50 mg/kg, degraded considerably after 6 months in the presence of a sewage inoculum during a bioremediation study(9). It was noted that 1,3,5-trimethylbenzene was more resistant to biodegradation than other compounds present(9). The time required for 0.2-1.0 mg/L of 1,3,5-trimethylbenzene to reach less than 1 ug/L was 110 hours in an Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: AQUATIC FATE: Based on a classification scheme(1), an experimental Koc range of 501-1,445(2-5), indicates that 1,3,5-trimethylbenzene is expected to adsorb to suspended solids and sediment(SRC). Volatilization from water surfaces is expected based upon a Henry's Law constant of 8.77X10-3 atm-cu m/mole(6). Using this Henry's Law constant and an estimation method(7), volatilization half-lives for a model river and model lake are 1.2 hours and 4.4 days, respectively(SRC). Residence times (with respect to volatilization) for 1,3,5-trimethylbenzene were calculated as 220 hours for both winter and summer conditions in Narragansett Bay(8). According to a classification scheme(9), BCF values of 23 to 342(10), measured in carp, suggest that bioconcentration in aquatic organisms may be high(SRC). Biodegradation may be an important fate process for this compound in water, and acclimation may increase the rate of biodegradation(SRC). The time required for 0.2-1.0 mg/L of 1,3,5-trimethylbenzene to reach less than 1 ug/L was 110 hours in an adapted groundwater aquifer contaminated with gasoline(11). 1,3,5-Trimethylbenzene was not detected in the effluent of an activated sludge plant that had a r Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: ATMOSPHERIC FATE: According to a model of gas/particle partitioning of semivolatile organic compounds in the atmosphere(1), 1,3,5-trimethylbenzene, which has a vapor pressure of 2.48 mm Hg at 25 °C(2), is expected to exist solely as a vapor in the ambient atmosphere. Vapor-phase 1,3,5-trimethylbenzene is degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals(SRC); the half-life for this reaction in air is estimated to be 11 hours(SRC), calculated from its rate constant of 5.75X10-11 cu cm/molecule-sec at 25 °C(1). 1,3,5-Trimethylbenzene also reacts with nitrate radicals in the atmosphere(3); the half-life for this reaction in air is estimated as 10-67 days(SRC). The photooxidation of 1,3,5-trimethylbenzene with nitrogen oxide produces formaldehyde and aliphatic aldehydes at 0.15-0.2 and 0.3-0.4 moles/mole 1,3,5-trimethylbenzene, respectively(5). 1,3,5-Trimethylbenzene does not contain chromophores that absorb wavelengths >290 nm(6) and therefore is not expected to be susceptible to direct photolysis by sunlight(SRC). Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Inventory details for MESITYLENE

INCI name

MESITYLENE

Description

Benzene, 1,3,5-trimethyl-,3,5-Dimethyltoluene

Record provenance

Inventory reference
90178
Imported identity
MESITYLENE
Source update
06/12/2013
European Commission CosIng source notes
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Key data

CAS
108-67-8
EC
203-604-4
Restriction
—
Function
SOLVENT
Dissolving other components of cosmetics. Solvents are usually liquids (aqueous and nonaqueous).

Official EU ingredient-name evidence

The ingredient name exactly matches the official 2025 EU glossary of common ingredient names.

#16287 · MESITYLENE

Ingredients with overlapping formulation functions

LINDERA UMBELLATA TWIG WATERHUMECTANT, SOLVENT
LINSEED OIL POLYGLYCERYL-4 ESTERSOPACIFYING, SOLVENT, SURFACTANT - CLEANSING, SURFACTANT - EMULSIFYING
MARIS AQUAHUMECTANT, SOLVENT
MEKPERFUMING, SOLVENT
METHOXY PEG-10HUMECTANT, SOLVENT
METHOXY PEG-10 POLYSILSESQUIOXANECLEANSING, HUMECTANT, SKIN CONDITIONING, SOLVENT, SURFACTANT - CLEANSING
METHOXY PEG-100HUMECTANT, SOLVENT
METHOXY PEG-16HUMECTANT, SOLVENT

Additional official and scientific sources

11 external databases to check this identity in

Each link searches that source for this identity. What each source is, and its legal weight

ECHA CHEM / Information on chemicalsPubChem PUG RESTEU Safety Gate cosmetic product alertsECHA CHEMUS EPA CompToxCosmetic Ingredient Review safety assessmentsFDA Global Substance Registration SystemILO/WHO International Chemical Safety CardsJapan NITE-CHRIPNIOSH Pocket Guide to Chemical HazardsOECD eChemPortal

How MESITYLENE appears in the CosIng inventory

The CosIng inventory lists MESITYLENE as a cosmetic ingredient and this page links it to 0 annex records. The inventory entry captures names and identifiers, while the annex records show where the substance is prohibited, restricted or positively listed in EU cosmetics law.

MESITYLENE is also tagged with 1 cosmetic function in the official data. Function labels describe intended use, but they do not replace regulatory review of linked annex records before formulation or labelling work.

Frequently asked questions

MESITYLENE is listed in the EU CosIng ingredient inventory with no direct annex restriction records linked at this time. Absence of an annex link does not guarantee unrestricted use — always verify against the current official CosIng database before formulating.

According to the EU CosIng inventory, MESITYLENE carries the following function designation(s):

CAS 108-67-8 may appear across multiple EU annex records. Viewing the CAS lookup page shows all Annex II–VI entries sharing this identifier, which is useful for identifying cross-annex regulatory status of the same chemical substance.
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Source note for MESITYLENE

This page reproduces the CosIng inventory entry for MESITYLENE from public European Commission cosmetic ingredient materials and shows linked identifiers even when no direct annex match is currently attached.

Use this inventory page to research MESITYLENE and compare linked records, but verify restrictions and legal status against the current official source text and law before making regulatory decisions.

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