Stearic acid

  • Octadecanoic acid
  • Cetylacetic acid
  • 1-Heptadecanecarboxylic acid
  • Hystrene
  • Neo-Fat 18
  • Stearophanic acid
Formula
CH3(CH2)16COOH
Structure
Description
White or slightly yellow, crystals or powder, with a slight tallow-like odor.
Uses
Chemical intermediate for metallic soaps & greases, household soap products, synthetic rubber vulcanization activators, alkylated & epoxy resins for surface coatings, synthetic rubber polymerization emulsifier, component of cosmetic formulations, pharmaceutical creams, of candles, lubricant in pharmaceutical tablet formulations, release agent in baked goods & confectioneries.

Registry Numbers and Inventories.
CAS
57-11-4
EC (EINECS/ELINCS)
200-313-4
R 36/37/38
RTECS
WI2800000
RTECS class
Tumorigen; Mutagen; Primary Irritant
Merck
12,8959
Beilstein/Gmelin
608585
Beilstein Reference
4-02-00-01206
EPA OPP
79082
Swiss Giftliste 1
G-7725
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C18H36O2
Formula mass
284.48
Melting point, °C
67
Boiling point, °C
361
Decomposition point, °C
394
Vapor pressure, mmHg
9E-6 (25 C)
Vapor density (air=1)
9.8
Saturation Concentration
Very low at 25 C
Evaporization number
Negligible
Odor Threshold Odor threshold 20 ppm
Critical temperature
557
Density
1.017 g/cm3 (17 C)
Solubility in water
Insoluble
Viscosity
176.50 cp (160 C)
Refractive index
1.4299 (20 C)
pKa/pKb
4.78 (pKa)
Partition coefficient, pKow
8.23
Heat of fusion
61.3 kJ/mol
Heat of vaporization
63.8 kJ/mol
Heat of combustion
-11326 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container.
Insufficient information
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Eyes: Wear chemical goggles. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear a chemical apron.
Respirators
A NIOSH/MSHA approved air purifying dust or mist respirator or European Standard EN 149.
Small spills/leaks
Vacuum or sweep up material and place into a suitable disposal container.
Disposal code
3
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Bases, oxidizing agents, reducing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
162
Autoignition, °C
395
Upper exp. limit, %
4.9
Lower exp. limit, %
0.4
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.
Hazards
This chemical can heat spontaneously.
Health
1
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure limit(s)
TLV (as stearates): ppm; 10 mg/m3 ACGIH 1996).
Poison_Class
-
Exposure effects
   Ingestion
Low hazard for usual industrial handling.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. Get medical aid if cough or other symptoms appear.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists.
   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
SRA
 
HS Code
3823 11 00
 
IMO Chemical Code
18
IMO Pollution Category
III