Pyromellitic acid

  • Benzene-1,2,4,5-tetracarboxylic acid
  • 1,2,4,5-Benzenetetracarboxylic acid
  • 1,2,4,5-Tetracarboxybenzene
Formula
C10H6O8
Structure
Description
Solid.

Registry Numbers and Inventories.
CAS
89-05-4
EC (EINECS/ELINCS)
201-879-5
EC Class
irritant
RTECS
DB9275000
RTECS class
Other
Merck
12,8188
Beilstein/Gmelin
1887659
Beilstein Reference
4-09-00-03804
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C10H6O8
Formula mass
254.15
Melting point, °C
272
Boiling point, °C
516
Vapor pressure, mmHg
1.5E-14 (25 C)
Density
1.79 g/cm3 (20 C)
Solubility in water
Very soluble
pKa/pKb
1.87 (pKa)
Partition coefficient, pKow
0.26
Heat of combustion
-3255 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. Avoid generating dusty conditions.
Disposal code
4
Stability
No data.
Incompatibilities
Strong oxidizing agents - strong bases.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Upper exp. limit, %
7.8
Lower exp. limit, %
1.2
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.

Health.
Exposure effects
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated. 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.
4. Organic acids
HS Code
2917 39 80