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2-Butanone																				Related Pages
Synonyms & Trade Names
			Ethyl methyl ketone, MEK, Methyl acetone, Methyl ethyl ketone
CAS No.
			78-93-3
	RTECS No.
			EL6475000
	DOT ID & Guide
			1193 127

FormulaCH3COCH2CH3
	Conversion
			1 ppm = 2.95 mg/m3
	IDLH
			3000 ppmSee: 78933

Exposure Limits
			NIOSH RELTWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)
					OSHA PEL TWA 200 ppm (590 mg/m3) See Appendix G
	Measurement Methods
			**NIOSH** 2500 , 2555 , 3800;**OSHA** 16 , 84 , 1004
					
					See: NMAM or OSHA Methods
										
Physical Description
			Colorless liquid with a moderately sharp, fragrant, mint- or acetone-like odor.													
										
Molecular Weight72.1	
	Boiling Point175°F
	Freezing Point-123°F
	Solubility28%
	Vapor Pressure78 mmHg
	Ionization Potential9.54 eV											
Specific Gravity0.81	
	Flash Point16°F
	Upper Explosive Limit(200°F): 11.4%
	Lower Explosive Limit(200°F): 1.4%
Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
Incompatibilities & Reactivities
			Strong oxidizers, amines, ammonia, inorganic acids, caustics, isocyanates, pyridines
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, nose; headache; dizziness; vomiting; dermatitis
Target Organs
			Eyes, skin, respiratory system, central nervous system
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet (flammable)
							**Change:**No recommendation
							**Provide:**Eyewash
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Water wash immediately
							**Breathing:**Fresh air
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH/OSHA****Up to 3000 ppm**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode£(APF = 25) Any powered, air-purifying respirator with organic vapor cartridge(s)£(APF = 50) Any chemical cartridge respirator with a full facepiece and organic vapor cartridge(s)(APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canister(APF = 50) Any self-contained breathing apparatus with a full facepiece(APF = 50) Any supplied-air respirator with a full facepiece**Emergency or planned entry into unknown concentrations or IDLH conditions:** (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus**Escape:** (APF = 50) Any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted organic vapor canisterAny appropriate escape-type, self-contained breathing apparatus
				Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 0179
					  MEDICAL TESTS: 0133

			
							

			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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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
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