1,2,4-Trimethylbenzene |
Synonyms & Trade Names Asymmetrical trimethylbenzene, psi-Cumene, Pseudocumene [Note: Hemimellitene is a mixture of the 1,2,3-isomer with up to 10% of related aromatics such as the 1,2,4-isomer.] |
CAS No. 95-63-6 |
RTECS No. DC3325000 |
DOT ID & Guide |
FormulaC6H3(CH3)3 |
Conversion 1 ppm = 4.92 mg/m3 |
IDLH N.D.
See: IDLH INDEX |
Exposure Limits NIOSH REL: TWA 25 ppm (125 mg/m3)
OSHA PEL†: none |
Measurement Methods
OSHA PV2091
See: NMAM or OSHA Methods |
Physical Description Clear, colorless liquid with a distinctive, aromatic odor. |
MW: 120.2 |
BP: 337°F |
FRZ: -77°F |
Sol: 0.006% |
VP(56°F): 1 mmHg |
IP: 8.27 eV |
Sp.Gr: 0.88 |
Fl.P: 112°F |
UEL: 6.4% |
LEL: 0.9% |
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| Class II Flammable Liquid |
Incompatibilities & Reactivities Oxidizers, nitric acid |
Exposure Routes inhalation, ingestion, skin and/or eye contact |
Symptoms irritation eyes, skin, nose, throat, respiratory system; bronchitis; hypochromic anemia; headache, drowsiness, lassitude (weakness, exhaustion), dizziness, nausea, incoordination; vomiting, confusion; chemical pneumonitis (aspiration liquid) |
Target Organs Eyes, skin, respiratory system, central nervous system, blood |
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Personal Protection/Sanitation (See protection codes)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Respiratory support
Swallow: Medical attention immediately |
Respirator Recommendations Not available.
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 1433
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