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1,2,4-Trimethylbenzene																				Related Pages
Synonyms & Trade Names
			Asymmetrical trimethylbenzene, psi-Cumene, Hemimellitene [1,2,4-Trimethylbenzene], 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 RELTWA 25 ppm (125 mg/m3)
					OSHA PEL none See Appendix G
	Measurement Methods
			**OSHA** PV2091
					
					See: NMAM or OSHA Methods
										
Physical Description
			Clear, colorless liquid with a distinctive, aromatic odor.													
										
Molecular Weight120.2	
	Boiling Point337°F
	Freezing Point-77°F
	Solubility0.006%
	Vapor Pressure(56°F): 1 mmHg
	Ionization Potential8.27 eV											
Specific Gravity0.88	
	Flash Point112°F
	Upper Explosive Limit6.4%
	Lower Explosive Limit0.9%
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
										
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
	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
					  ICSC CARD: 1433

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
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CAS Numbers
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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