2-Butanone
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CAS
78-93-3
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CH3COCH2CH3
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RTECS
EL6475000
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Synonyms & Trade Names
Ethyl methyl ketone, MEK, Methyl acetone, Methyl ethyl ketone
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DOT ID & Guide
1193 127
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Exposure
Limits
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NIOSH REL: TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)
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OSHA PEL†: TWA 200 ppm (590 mg/m3)
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IDLH
3000 ppm
See: 78933
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Conversion
1 ppm = 2.95 mg/m3
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Physical Description
Colorless liquid with a moderately sharp, fragrant, mint- or acetone-like odor.
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MW: 72.1
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BP: 175°F
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FRZ: -123°F
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Sol: 28%
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VP: 78 mmHg
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IP: 9.54 eV
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Sp.Gr: 0.81
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Fl.P: 16°F
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UEL(200°F): 11.4%
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LEL(200°F): 1.4%
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Class IB Flammable Liquid: Fl.P. below 73°F and BP at or above 100°F.
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Incompatibilities & Reactivities
Strong oxidizers, amines, ammonia, inorganic acids, caustics, isocyanates, pyridines
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Measurement Methods
NIOSH 2500, 2555, 3800; OSHA 16, 84, 1004
See: NMAM or OSHA Methods
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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 (flammable)
Change: No recommendation
Provide: Eyewash
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Water wash immediately
Breathing: Fresh air
Swallow: Medical attention immediately
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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 canister/Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, nose; headache; dizziness; vomiting; dermatitis
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Target Organs
Eyes, skin, respiratory system, central nervous system
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See also: INTRODUCTION
See ICSC CARD: 0179 See MEDICAL TESTS: 0133
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