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| 2-Butanone | CAS 78-93-3 | ||
| CH3COCH2CH3 | RTECS EL6475000 | ||
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Synonyms & Trade Names Ethyl methyl ketone, MEK, Methyl acetone, Methyl ethyl ketone |
DOT ID & Guide 1193 127 1232 127 |
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Exposure Limits |
NIOSH REL: TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3) | ||
| OSHA PEL†: TWA 200 ppm (590 mg/m3) | |||
| IDLH 3000 ppm See: 78933 | 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 |
BP: 175°F |
FRZ: -123°F |
Sol: 28% |
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VP: 78 mmHg |
IP: 9.54 eV |
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Sp.Gr: 0.81 |
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Fl.P: 16°F |
UEL(200°F): 11.4% |
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, 3800; OSHA 16, 84, 1004 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation 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 |
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Important additional information about respirator selection 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 |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| 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 |