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
EC Risk Phrase R 37 41 42/43
EC Safety Phrase 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.
NFPA 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 171
USCG Compatatibility Group 11 Organic anhydrides
HS Code 2917 39 80