NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Trimellitic anhydride

CAS
552-30-7

C9H4O5

RTECS
DC2050000
Synonyms & Trade Names

1,2,4-Benzenetricarboxylic anhydride; 4-Carboxyphthalic anhydride; TMA; TMAN; Trimellic acid anhydride [Note: TMA is also a synonym for Trimethylamine.]
DOT ID & Guide

Exposure
Limits

NIOSH REL: TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance.
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
1 ppm = 7.86 mg/m3
Physical Description
Colorless solid.
MW: 192.1
BP: ?
MLT: 322°F
Sol: ?
VP: 0.000004 mmHg
IP: ?

Sp.Gr: ?
Fl.P: NA
UEL: NA
LEL: NA

Combustible Solid
Incompatibilities & Reactivities

None reported
Measurement Methods
NIOSH 5036; OSHA 98
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

First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, skin, nose, respiratory system; pulmonary edema, respiratory sensitization; rhinitis, asthma, cough, wheezing, dyspnea (breathing difficulty), malaise (vague feeling of discomfort), fever, muscle aches, sneezing
Target Organs
Eyes, skin, respiratory system
See also: INTRODUCTION   See ICSC CARD: 0345