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| Mesityl oxide | CAS 141-79-7 | ||
| (CH3)2C=CHCOCH3 | RTECS SB4200000 | ||
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Synonyms & Trade Names Isobutenyl methyl ketone, Isopropylideneacetone, Methyl isobutenyl ketone, 4-Methyl-3-penten-2-one |
DOT ID & Guide 1229 129 |
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Exposure Limits |
NIOSH REL: TWA 10 ppm (40 mg/m3) | ||
| OSHA PEL�: TWA 25 ppm (100 mg/m3) | |||
| IDLH 1400 ppm [10%LEL] | Conversion 1 ppm = 4.02 mg/m3 | ||
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Physical Description Oily, colorless to light-yellow liquid with a peppermint- or honey-like odor. |
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MW: 98.2 |
BP: 266°F |
FRZ: -52°F |
Sol: 3% |
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VP: 9 mmHg |
IP: 9.08 eV |
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Sp.Gr(59°F): 0.86 |
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Fl.P: 87°F |
UEL: 7.2% |
LEL: 1.4% |
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| Class IC Flammable Liquid: Fl.P. at or above 73�F and below 100�F. | |||
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Incompatibilities & Reactivities Oxidizers, acids |
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Measurement Methods NIOSH 1301; OSHA 7 |
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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: Quick drench |
First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Respirator Recommendations
NIOSH Up to 250 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)� Up to 500 ppm: (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 powered, air-purifying respirator with a tight-fitting facepiece and organic vapor cartridge(s)�/(APF = 50) Any self-contained breathing apparatus with a full facepiece/(APF = 50) Any supplied-air respirator with a full facepiece Up to 1400 ppm: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode 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, mucous membrane; narcosis, coma; in animals: liver, kidney damage; central nervous system effects | |
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Target Organs
Eyes, skin, respiratory system, central nervous system, liver, kidneys |
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| See also: INTRODUCTION |