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Maleic anhydride																				Related Pages
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/m3See: 108316

Exposure Limits
			NIOSH RELTWA 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.													
										
Molecular Weight98.1	
	Boiling Point396°F
	Melting Point127°F
	SolubilityReacts
	Vapor Pressure0.2 mmHg
	Ionization Potential9.90 eV											
Specific Gravity1.48	
	Flash Point218°F
	Upper Explosive Limit7.1%
	Lower Explosive Limit1.4%
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
										
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
					  ICSC CARD: 0799
					  MEDICAL TESTS: 0256

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
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Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
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