Phthalic anhydride
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CAS
85-44-9
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C6H4(CO)2O
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RTECS
TI3150000
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Synonyms & Trade Names
1,2-Benzenedicarboxylic anhydride; PAN; Phthalic acid anhydride
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DOT ID & Guide
2214 / 156
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Exposure
Limits
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NIOSH REL: TWA 6 mg/m3 (1 ppm)
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OSHA PEL†: TWA 12 mg/m3 (2 ppm)
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IDLH
60 mg/m3
See: 85449
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Conversion
1 ppm = 6.06 mg/m3
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Physical Description
White solid (flake) or a clear, colorless, mobile liquid (molten) with a characteristic, acrid odor.
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MW: 148.1
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BP: 563°F
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MLT: 267°F
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Sol: 0.6%
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VP: 0.0015 mmHg
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IP: 10.00 eV
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Sp.Gr: 1.53 (Flake) 1.20 (Molten)
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Fl.P: 305°F
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UEL: 10.5%
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LEL: 1.7%
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Combustible Solid
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Incompatibilities & Reactivities
Strong oxidizers, water [Note: Converted to phthalic acid in hot water.]
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Measurement Methods
NIOSH S179 (II-3); OSHA 90
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: Daily
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First Aid (See procedures)
Eye: Irrigate immediately
Skin: Soap wash promptly
Breathing: Respiratory support
Swallow: Medical attention immediately
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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
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Exposure Routes
inhalation, ingestion, skin and/or eye contact
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Symptoms
Irritation eyes, skin, upper respiratory system; conjunctivitis; nasal ulcer bleeding; bronchitis, bronchial asthma; dermatitis; in animals: liver, kidney damage
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Target Organs
Eyes, skin, respiratory system, liver, kidneys
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See also: INTRODUCTION
See ICSC CARD: 0315 See MEDICAL TESTS: 0192
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