Trimellitic anhydride

  • 1,2,4-Benzenetricarboxylic anhydride
  • 1,3-Dihydro-1,3-dioxo-5-isobenzofurancarboxylic acid
  • Benzene-1,2,4-Tricarboxylic acid 1,2-Anhydride
Formula
C9H4O5
Structure
Description
Crystals or off-white flakes.
Uses
In prepn of resins, adhesives, polymers, dyes, printing inks.

Registry Numbers and Inventories.
CAS
552-30-7
EC (EINECS/ELINCS)
209-008-0
EC Index Number
607-097-00-4
EC Class
Irritant; Sensitising
R 37 41 42/43
S 22 26 36/37/39
RTECS
DC2050000
RTECS class
Other
UN (DOT)
3335
Merck
12,9833
Beilstein/Gmelin
9394
Beilstein Reference
5-18-08-00312
Swiss Giftliste 1
G-3006
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C9H4O5
Formula mass
192.13
Melting point, °C
162 - 165
Boiling point, °C
471
Vapor pressure, mmHg
1.2E-9 (25 C)
Vapor density (air=1)
6.6
Density
1.55 g/cm3 (20 C)
Solubility in water
216 g/L
Partition coefficient, pKow
1.07
Heat of fusion
21.8 kJ/mol
Heat of vaporization
77.2 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Handling
Wash thoroughly after handling. Avoid contact with skin and eyes. Do not ingest or inhale. Use only in a chemical fume hood.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents, strong acids, strong bases.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
227
Upper exp. limit, %
7
Lower exp. limit, %
1
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential
This chemical is combustible.
Health
3
 
Flammability
1
 
 
Reactivity
1
 

Health.
Exposure limit(s)
TLV: 0.005 ppm; 0.04 mg/m3 (ACGIH 1992-1993). NIOSH REL: TWA 0.005 ppm (0.04 mg/m3) Should be handled in the workplace as an extremely toxic substance.
Poison_Class
-
Exposure effects
Chronic inhalation may cause effects similar to those of acute inhalation.
   Ingestion
May cause irritation of the digestive tract. May cause nausea and vomiting.
   Inhalation
Causes respiratory tract irritation. May cause severe allergic respiratory reaction. May cause anemia. Similar compounds have caused asthma, cough, wheezing, shortness of breath, anemia, weakness chills, fever, aching muscles and joints. May lead to restrictive lung disease.
   Skin
Causes skin irritation. Causes redness and pain.
   Eyes
Causes eye irritation. Causes redness and pain.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Get medical aid immediately. Wash mouth out with water.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
UN number
3335
Response guide
11 Organic anhydrides
HS Code
2917 39 80