September 2010
NIOSH Publication Number 2010-168c

Trimellitic anhydride

Synonyms & Trade Names
1,2,4-Benzenetricarboxylic anhydride; 4-Carboxyphthalic anhydride; TMA; TMAN; Trimellic acid anhydride [Note: TMA is also a synonym for Trimethylamine.]
CAS No.
552-30-7
RTECS No.
DC2050000
DOT ID & Guide
Formula
C9H4O5
Conversion
1 ppm = 7.86 mg/m3
IDLH
N.D.
See: IDLH INDEX
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
Measurement Methods

NIOSH 98
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
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, nose, respiratory system; pulmonary edema, resp sensitization; rhinitis, asthma, cough, wheezing, dyspnea (breathing difficulty), malaise (vague feeling of discomfort), fever, muscle aches, sneezing
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: 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

See also: INTRODUCTION   See ICSC CARD: 0345