p-Cymene

  • 4-Isopropyltoluene
  • Dolcymene
  • 1-Methyl-4-isopropylbenzene
  • Camphogen
  • 1-Methyl-4-(1-methylethyl)benzene
Formula
C10H14
Structure
Description
Clear, colorless liquid with a lemon-like odor.
Uses
As thinner for lacquers & varnishes usually with other solvents & aromatic hydrocarbons.

Registry Numbers and Inventories.
CAS
99-87-6
EC (EINECS/ELINCS)
202-796-7
R 10 37/38
RTECS
GZ5950000
RTECS class
Natural Product; Primary Irritant
UN (DOT)
2046
Merck
13,2792
Beilstein/Gmelin
1903377
Beilstein Reference
4-05-00-01060
Swiss Giftliste 1
G-1468
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C10H14
Formula mass
134.24
Melting point, °C
-67.9
Boiling point, °C
176
Vapor pressure, mmHg
1.7 (25 C)
Vapor density (air=1)
4.62
Critical temperature
386
Critical pressure
28.7
Density
0.8573 g/cm3 (20 C)
Solubility in water
Insoluble
Viscosity
0.87 cp (20 C)
Surface tension
28.09 g/s2
Refractive index
1.4624 (20 C)
Dielectric constant
2.24 (25 C)
Partition coefficient, pKow
4.10
Heat of fusion
9.6 kJ/mol
Heat of vaporization
44.6 kJ/mol
Heat of combustion
-5919 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.
B3 D2B
Handling
Wash thoroughly after handling. Use with adequate ventilation. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong oxidizing agents
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
47
Autoignition, °C
436
Upper exp. limit, %
5.6
Lower exp. limit, %
0.7
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Containers may explode in the heat of a fire. Extinguishing media: Use water spray to cool fire-exposed containers. Water may be ineffective. In case of fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential
Moderately flammable. Combustion with moderate heating.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
2
 
 
Reactivity
0
 

Health.
Poison_Class
4
Exposure effects
Chronic inhalation may cause effects similar to those of acute inhalation. Prolonged or repeated skin contact may cause defatting and dermatitis.
   Ingestion
May cause irritation of the digestive tract. Aspiration of material into the lungs may cause chemical pneumonitis, which may be fatal.
   Inhalation
Causes respiratory tract irritation. May cause narcotic effects in high concentration. May cause drowsiness, unconsciousness, and central nervous system depression.
   Skin
Causes skin irritation. Prolonged and/or repeated contact may cause defatting of the skin and dermatitis. May be absorbed through the skin.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
Do NOT induce vomiting. If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Possible aspiration hazard. 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
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.
UN number
2046
Response guide
Hazard class
3
Packing Group
III
 
USCG CHRIS Code
CMP
 
32 Aromatic hydrocarbons
IMO Chemical Code
17
IMO Pollution Category
C
IMO Hazard code
P