Eicosanoic acid

  • Arachidic acid
  • Arachic acid
  • Icosanoic acid
Formula
CH3(CH2)18COOH
Structure
Description
White powder.

Registry Numbers and Inventories.
CAS
506-30-9
EC (EINECS/ELINCS)
208-031-3
RTECS
JX3780000
RTECS class
Tumorigen
Merck
12,802
Beilstein/Gmelin
1788211
Beilstein Reference
4-02-00-01275
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C20H40O2
Formula mass
312.54
Melting point, °C
75.5
Boiling point, °C
328
Vapor pressure, mmHg
2.5E-6 (25 C)
Critical temperature
547
Critical pressure
12.2
Density
0.838 g/cm3 (80 C) (liquid)
Solubility in water
Insoluble
Viscosity
9.78 cp (80 C)
Surface tension
29.0 g/s2 (80 C)
Refractive index
1.425 (20 C)
pKa/pKb
4.78 (pKa)
Partition coefficient, pKow
9.28
Heat of fusion
71.0 kJ/mol
Heat of vaporization
65.8 kJ/mol
Heat of combustion
-12668 kJ/mol

Hazards and Protection.
Storage
Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
Handling
Wash thoroughly after handling. 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
Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions.
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
170
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, dry chemical, chemical foam, or alcohol-resistant foam.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
The toxicological properties of this material have not been investigated.
   Ingestion
The toxicological properties of this substance have not been fully investigated.
   Inhalation
The toxicological properties of this substance have not been fully investigated. Inhalation of dust may cause respiratory tract irritation.
   Skin
No information regarding skin irritation and other potential effects was found.
   Eyes
No information regarding eye irritation and other potential effects was found.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   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.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
USCG CHRIS Code
FAD
 
IMO Chemical Code
18
IMO Pollution Category
III