Maleic anhydride |
Synonyms & Trade Names cis-Butenedioic anhydride; 2,5-Furanedione; Maleic acid anhydride; Toxilic anhydride |
CAS No. 108-31-6 |
RTECS No. ON3675000 |
DOT ID & Guide 2215 156 |
FormulaC4H2O3 |
Conversion 1 ppm = 4.01 mg/m3 |
IDLH 10 mg/m3
See: 108316 |
Exposure Limits NIOSH REL: TWA 1 mg/m3 (0.25 ppm)
OSHA PEL: TWA 1 mg/m3 (0.25 ppm) |
Measurement Methods
NIOSH 3512;
OSHA 25 , 86
See: NMAM or OSHA Methods |
Physical Description Colorless needles, white lumps, or pellets with an irritating, choking odor. |
MW: 98.1 |
BP: 396°F |
MLT: 127°F |
Sol: Reacts |
VP: 0.2 mmHg |
IP: 9.90 eV |
Sp.Gr: 1.48 |
Fl.P: 218°F |
UEL: 7.1% |
LEL: 1.4% |
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| Combustible Solid, but may be difficult to ignite. |
Incompatibilities & Reactivities Strong oxidizers, water, alkalis, metals, caustics & amines above 150°F [Note: Reacts slowly with water (hydrolyzes) to form maleic acid.] |
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 |
Target Organs Eyes, skin, respiratory system |
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Personal Protection/Sanitation (See protection codes)
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 |
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 |
| See also: INTRODUCTION See ICSC CARD: 0799 See MEDICAL TESTS: 0256 |
