Thymol

  • p-Cymen-3-ol
  • FEMA number 3066
  • 3-Hydroxy-p-cymene
  • 3-Hydroxy-1-methyl-4-isopropylbenzene
  • 6-Isopropyl-m-cresol
  • 2-Isopropyl-5-methylphenol
Formula
C10H14O
Structure
Description
Colorless crystals, thyme-like aromatic odor.
Uses
For destroying mold, preserving documents, art objects, and urine. Stabilizer (antioxidant) for trichloroethylene, haloethane.

Registry Numbers and Inventories.
CAS
89-83-8
EC (EINECS/ELINCS)
201-944-8
EC Index Number
604-032-00-1
EC Class
Harmful; Corrosive; Dangerous for the Environment
R 22 34 51/53
S 26 28 36/37/39 45 61
RTECS
XP2275000
RTECS class
Drug; Mutagen; Reproductive Effector
UN (DOT)
3251
Merck
12,9540
Beilstein/Gmelin
1907135
Beilstein Reference
4-06-00-03334
EPA OPP
80402
Swiss Giftliste 1
G-2948
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C10H14O
Formula mass
150.24
Melting point, °C
49 - 51
Boiling point, °C
233
Vapor pressure, mmHg
30 (30 C)
Saturation Concentration
2.9 ppm (0.0003%) at 25 C (calculated)
Odor Threshold Odor threshold 0.05 mg/L
Critical temperature
425
Density
0.9898 - 0.9199 g/cm3 (0 - 90 C)
Solubility in water
1 g/L
Refractive index
1.5227 (20 C)
pKa/pKb
10.62 (pKa)
Partition coefficient, pKow
3.30
Heat of fusion
14.65 kJ/mol
Heat of vaporization
51.57 kJ/mol

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use only in a well ventilated area. Minimize dust generation and accumulation. Keep container tightly closed. Do not get on skin or in eyes. Do not ingest or inhale. Discard contaminated shoes.
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
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
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.
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Avoid contact with strong bases, oxidizing agents, acetanilide; antipyrine; camphor; monobromated camphor; cholorohydrate; menthol; quinine sulfate; salol, urethene, spirit nitrous ether.
Decomposition
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Fire.
Flash Point,°C
104
Autoignition, °C
285
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.
Fire potential
Flammable.
Hazards
When heated, emits toxic fumes.
Combustion products
Fire may produce irritating and/or toxic gases.
Health
3
 
Flammability
1
 
 
Reactivity
0
 

Health.
Poison_Class
3
Exposure effects
Effects may be delayed. May cause reproductive effects.
   Ingestion
May cause severe and permanent damage to the digestive tract. Causes gastrointestinal tract burns. May cause perforation of the digestive tract. May be harmful if swallowed. May cause systemic effects.
   Inhalation
Causes chemical burns to the respiratory tract. Aspiration may lead to pulmonary edema. May cause systemic effects.
   Skin
Causes skin burns. May cause skin rash (in milder cases), and cold and clammy skin with cyanosis or pale color.
   Eyes
Causes eye burns. May cause chemical conjunctivitis and corneal damage.

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. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
Get medical aid immediately. Immediately flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Destroy contaminated shoes.
   Eyes
Get medical aid immediately. Do NOT allow victim to rub or keep eyes closed. Extensive irrigation is required (at least 30 minutes).

Transport.
UN number
3251
Response guide
Hazard class
4.1
Packing Group
III
 
20. Alcohols. Glycols
HS Code
2907 19 00