Maleic anhydride
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CAS
108-31-6
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C4H2O3
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RTECS
ON3675000
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Synonyms & Trade Names
cis-Butenedioic anhydride; 2,5-Furanedione; Maleic acid anhydride; Toxilic anhydride
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DOT ID & Guide
2215 / 156
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Exposure
Limits
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NIOSH REL: TWA 1 mg/m3 (0.25 ppm)
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OSHA PEL: TWA 1 mg/m3 (0.25 ppm)
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IDLH
10 mg/m3
See: 108316
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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
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BP: 396°F
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MLT: 127°F
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Sol: Reacts
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VP: 0.2 mmHg
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IP: 9.90 eV
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Sp.Gr: 1.48
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Fl.P: 218°F
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UEL: 7.1%
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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
See: NMAM or OSHA Methods |
Personal Protection & Sanitation (See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: When contaminated
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash
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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 an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters./Any appropriate escape-type, self-contained breathing apparatus
Important additional information about respirator selection
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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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
See ICSC CARD: 0799 |
