| Agent Name |
Trimethyl benzene isomers |
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| CAS Number |
25551-13-7; 526-73-8; 95-63-6; 108-67-8 |
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| Formula |
C9-H12 |
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| Major Category |
Solvents |
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| Synonyms |
Mesitylene; Symmetrical trimethylbenzene; sym-Trimethylbenzene; Assymetrical trimethylbenzene; psi-Cumene; Pseudocumene; Hemimellitene; Hemelitol; [NIOSH] Methylxylene; Trimethyl benzene; Benzene, trimethyl-; Benzene, trimethyl- (mixed isomers); Trimethylbenzenes; [ChemIDplus] 1,2,3-Trimethylbenzene; 1,2,4-Trimethylbenzene; 1,3,5-Trimethylbenzene; [Hawley] UN1993; UN2325 (1,3,5-Trimethylbenzene) |
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| Category |
Aromatic Solvents |
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| Description |
Clear, colorless liquid with a distinctive, aromatic odor; [NIOSH] |
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| Sources/Uses |
Used in the synthesis of organic chemicals; also used in plastics as an ultraviolet stabilizer and in solvents; [ACGIH] |
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| Comments |
Hemimellitene is a mixture of the 1,2,3-isomer with up to 10% of related aromatics such as the 1,2,4-isomer. Hemelitol is the 1,2,3-isomer. [NIOSH] A skin, eye, and respiratory tract irritant; Inhalation of high concentrations may cause CNS effects; [ICSC] |
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| Exposure Assessment |
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| Skin Designation (ACGIH) |
No |
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| TLV (ACGIH) |
25 ppm, mixed isomers |
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| MAK |
20 ppm |
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| Vapor Pressure |
2.1 mm Hg |
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| Odor Threshold Low |
0.006 ppm |
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| Odor Threshold High |
2.4 ppm |
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| Explanatory Notes |
Detection odor threshold from AIHA (mean = 2.4 ppm and 2.2 ppm respectively for 1,2,4-trimethyl benzene and 1,3,5-trimethyl benzene); The Guide from the Emergency Response Guidebook is for "1,3,5-Trimethylbenzene." |
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| Flammability (NFPA) |
2: high ambient temperature required |
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| Adverse Effects |
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| Neurotoxin |
CNS Solvent Syndrome |
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| Links to Other NLM Databases |
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| Health Studies |
Human Health Effects from Hazardous Substances Data Bank: TRIMETHYLBENZENES
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