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Methyl acetate |
CAS 79-20-9 | ||
CH3COOCH3 |
RTECS AI9100000 | ||
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Synonyms & Trade Names Methyl ester of acetic acid, Methyl ethanoate |
DOT ID & Guide 1231 129 |
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Exposure
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NIOSH REL: TWA 200 ppm (610 mg/m3) ST 250 ppm (760 mg/m3) | ||
| OSHA PEL†: TWA 200 ppm (610 mg/m3) | |||
| IDLH 3100 ppm [10%LEL] See: 79209 | Conversion 1 ppm = 3.03 mg/m3 | ||
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Physical Description Colorless liquid with a fragrant, fruity odor. |
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MW: 74.1 |
BP: 135°F |
FRZ: -145°F |
Sol: 25% |
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VP: 173 mmHg |
IP: 10.27 eV |
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Sp.Gr: 0.93 |
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Fl.P: 14°F |
UEL: 16% |
LEL: 3.1% |
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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 Nitrates; strong oxidizers, alkalis & acids; water [Note: Reacts slowly with water to form acetic acid & methanol.] |
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Measurement Methods NIOSH 1458; OSHA 7 See: NMAM or OSHA Methods |
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Personal Protection & Sanitation (See protection) Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet (flammable) Change: No recommendation |
First Aid (See procedures) Eye: Irrigate immediately Skin: Water flush promptly Breathing: Respiratory support Swallow: Medical attention immediately |
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Important additional information about respirator selection Respirator Recommendations NIOSH/OSHA Up to 2000 ppm: (APF = 10) Any chemical cartridge respirator with organic vapor cartridge(s)* (APF = 10) Any supplied-air respirator* Up to 3100 ppm: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode* (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 = 25) Any powered, air-purifying respirator with 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 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, throat; headache, drowsiness; optic nerve atrophy; chest tightness; in animals: narcosis | |
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Target Organs
Eyes, skin, respiratory system, central nervous system |
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| See also: INTRODUCTION See ICSC CARD: 0507 |