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Phthalic anhydride																				Related Pages
Synonyms & Trade Names
			1,2-Benzenedicarboxylic anhydride, PAN, Phthalic acid anhydride
CAS No.
			85-44-9
	RTECS No.
			TI3150000
	DOT ID & Guide
			2214 156

FormulaC6H4(CO)2O
	Conversion
			1 ppm = 6.06 mg/m3
	IDLH
			60 mg/m3See: 85449

Exposure Limits
			NIOSH RELTWA 6 mg/m3 (1 ppm)
					OSHA PEL TWA 12 mg/m3 (2 ppm) See Appendix G
	Measurement Methods
			**NIOSH** S179 (II-3);**OSHA** 90
					
					See: NMAM or OSHA Methods
										
Physical Description
			White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor.													
										
Molecular Weight148.1	
	Boiling Point563°F
	Melting Point267°F
	Solubility0.6%
	Vapor Pressure0.0015 mmHg
	Ionization Potential10.00 eV											
Specific Gravity1.53 (Flake) 1.20 (Molten)	
	Flash Point305°F
	Upper Explosive Limit10.5%
	Lower Explosive Limit1.7%
Combustible Solid
Incompatibilities & Reactivities
			Strong oxidizers, water
					[Note: Converted to phthalic acid in hot water.]
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, upper respiratory system; conjunctivitis; nasal ulcer bleeding; bronchitis, bronchial asthma; dermatitis; In Animals: liver, kidney damage
Target Organs
			Eyes, skin, respiratory system, liver, kidneys
										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**Daily
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap wash promptly
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH****Up to 30 mg/m3**: (APF = 5) Any quarter-mask respirator. Click here for information on selection of N, R, or P filters.***Up to 60 mg/m3**: (APF = 10) Any particulate respirator equipped with an N95, R95, or P95 filter (including N95, R95, and P95 filtering facepieces) except quarter-mask respirators. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.*/(APF = 10) Any air-purifying full-facepiece respirator equipped with an N95, R95, or P95 filter. The following filters may also be used: N99, R99, P99, N100, R100, P100. Click here for information on selection of N, R, or P filters.(APF = 25) Any powered, air-purifying respirator with a high-efficiency particulate filter.*(APF = 10) Any supplied-air respirator*(APF = 50) Any self-contained breathing apparatus 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 with 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: 0315
					  MEDICAL TESTS: 0192

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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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
Personal Protection and Sanitation Codes
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