2-Butanone |
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 ppm
See: 78933 |
Exposure Limits NIOSH REL: TWA 200 ppm (590 mg/m3) ST 300 ppm (885 mg/m3)
OSHA PEL†: TWA 200 ppm (590 mg/m3) |
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. |
MW: 72.1 |
BP: 175°F |
FRZ: -123°F |
Sol: 28% |
VP: 78 mmHg |
IP: 9.54 eV |
Sp.Gr: 0.81 |
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. |
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 |
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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 |
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 canister
Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection |
| See also: INTRODUCTION See ICSC CARD: 0179 See MEDICAL TESTS: 0133 |
