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| Maleic anhydride | CAS 108-31-6 | ||
| C4H2O3 | RTECS ON3675000 | ||
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Synonyms & Trade Names cis-Butenedioic anhydride; 2,5-Furanedione; Maleic acid anhydride; Toxilic anhydride |
DOT ID & Guide 2215 156 |
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Exposure Limits |
NIOSH REL: TWA 1 mg/m3 (0.25 ppm) | ||
| OSHA PEL: TWA 1 mg/m3 (0.25 ppm) | |||
| IDLH 10 mg/m3 | Conversion 1 ppm = 4.01 mg/m3 | ||
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Physical Description Colorless needles, white lumps, or pellets with an irritating, choking odor. |
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MW: 98.1 |
BP: 396°F |
MLT: 127°F |
Sol: Reacts |
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VP: 0.2 mmHg |
IP: 9.90 eV |
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Sp.Gr: 1.48 |
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Fl.P: 218°F |
UEL: 7.1% |
LEL: 1.4% |
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| Combustible Solid, but may be difficult to ignite. | |||
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Incompatibilities & Reactivities Strong oxidizers, water, alkalis, metals, caustics & amines above 150°F [Note: Reacts slowly with water (hydrolyzes) to form maleic acid.] |
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Measurement Methods NIOSH 3512; OSHA 25, 86 |
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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 |
First Aid (See procedures) Eye: Irrigate immediately Skin: Soap wash immediately Breathing: Respiratory support Swallow: Medical attention immediately |
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Respirator Recommendations
NIOSH/OSHA Up to 10 mg/m3: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode�/(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 having a high-efficiency particulate filter/Any appropriate escape-type, self-contained breathing apparatus |
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| Exposure Routes inhalation, ingestion, skin and/or eye contact | |
| Symptoms Irritation nose, upper respiratory system; conjunctivitis; photophobia (abnormal visual intolerance to light), double vision; bronchial asthma; dermatitis | |
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Target Organs
Eyes, skin, respiratory system |
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| See also: INTRODUCTION |