m-Phthalic acid

  • 1,3-Benzenedicarboxylic acid
  • Isophthalic acid
Formula
C6H4-1,3-(COOH)2
Structure
Description
White crystals or powder.
Uses
Chemical intermediate for diphenyl isophthalate.

Registry Numbers and Inventories.
CAS
121-91-5
EC (EINECS/ELINCS)
204-506-4
R 36/37/38
RTECS
NT2007000
RTECS class
Primary Irritant
Merck
13,5216
Beilstein/Gmelin
1909332
Beilstein Reference
4-09-00-03292
Swiss Giftliste 1
G-2027
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C8H6O4
Formula mass
166.13
Melting point, °C
345 - 348
Boiling point, °C
119 - 121 (6 torr)
Vapor pressure, mmHg
2E-7 (25 C)
Saturation Concentration
Very low at normal temperatures.
Evaporization number
Probably very low at normal temperatures.
Critical temperature
734
Critical pressure
39.0
Density
1.54 g/cm3 (20 C)
Solubility in water
1 g/L
pKa/pKb
3.70 (pKa)
Partition coefficient, pKow
1.66
Heat of fusion
43.2 kJ/mol
Heat of vaporization
124.70 kJ/mol
Heat of combustion
-3203 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Insufficient information
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
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
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Disposal code
4
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
329
Autoignition, °C
700
Upper exp. limit, %
7.7
Lower exp. limit, %
1.3
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Hazards
Dust forms explosive mixture in air.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation.
   Ingestion
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
   Inhalation
May cause respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
May cause skin irritation. The toxicological properties of this material have not been fully investigated.
   Eyes
May cause eye irritation. The toxicological properties of this material have not been fully investigated.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
USCG CHRIS Code
IPL
 
HS Code
2917 39 80