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| Acetic anhydride | CAS 108-24-7 | ||
| (CH3CO)2O | RTECS AK1925000 | ||
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Synonyms & Trade Names Acetic acid anhydride, Acetic oxide, Acetyl oxide, Ethanoic anhydride |
DOT ID & Guide 1715 137 |
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Exposure Limits |
NIOSH REL: C 5 ppm (20 mg/m3) | ||
| OSHA PEL�: TWA 5 ppm (20 mg/m3) | |||
| IDLH 200 ppm | Conversion 1 ppm = 4.18 mg/m3 | ||
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Physical Description Colorless liquid with a strong, pungent, vinegar-like odor. |
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MW: 102.1 |
BP: 282°F |
FRZ: -99°F |
Sol: 12% |
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VP: 4 mmHg |
IP: 10.00 eV |
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Sp.Gr: 1.08 |
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Fl.P: 120°F |
UEL: 10.3% |
LEL: 2.7% |
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| Class II Combustible Liquid: Fl.P. at or above 100�F and below 140�F. | |||
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Incompatibilities & Reactivities Water, alcohols, strong oxidizers (especially chromic acid), amines, strong caustics [Note: Corrosive to iron, steel & other metals. Reacts with water to form acetic acid.] |
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Measurement Methods NIOSH 3506; OSHA 82, 102 |
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Personal Protection & Sanitation Skin: Prevent skin contact Eyes: Prevent eye contact Wash skin: When contaminated Remove: When wet or contaminated Change: No recommendation Provide: Eyewash, 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/OSHA Up to 125 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 200 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 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 Conjunctivitis, lacrimation (discharge of tears), corneal edema, opacity, photophobia (abnormal visual intolerance to light); nasal, pharyngeal irritation; cough, dyspnea (breathing difficulty), bronchitis; skin burns, vesiculation, sensitization dermatitis | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |